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GitLab

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<h3>

Gary E. Miller pushed to branch master

at <a href="https://gitlab.com/NTPsec/ntpsec">NTPsec / ntpsec</a>

</h3>

<h4>

Commits:

</h4>

<ul>

<li>

<strong><a href="https://gitlab.com/NTPsec/ntpsec/commit/006f96b91880a5d39928dfbd4b0e9d2be8a8db28">006f96b9</a></strong>

<div>

<span>by Paul Theodoropoulos</span>

<i>at 2018-08-07T22:22:27Z</i>

</div>

<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">more typo fixes etc

</pre>

</li>

<li>

<strong><a href="https://gitlab.com/NTPsec/ntpsec/commit/f0f97aed8039bc6d18cefa829b813ca18a0084b8">f0f97aed</a></strong>

<div>

<span>by Paul Theodoropoulos</span>

<i>at 2018-08-07T23:10:02Z</i>

</div>

<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">typos; wordsmithing; other fixes

</pre>

</li>

<li>

<strong><a href="https://gitlab.com/NTPsec/ntpsec/commit/99e19c431d300d5f59690b08b637cfee51a16fb5">99e19c43</a></strong>

<div>

<span>by Paul Theodoropoulos</span>

<i>at 2018-08-08T17:19:45Z</i>

</div>

<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">conform remaining urls to available https

</pre>

</li>

<li>

<strong><a href="https://gitlab.com/NTPsec/ntpsec/commit/c1c0576849f466f6ec690b6a6fea6ca475ec14e8">c1c05768</a></strong>

<div>

<span>by Paul Theodoropoulos</span>

<i>at 2018-08-08T17:42:43Z</i>

</div>

<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">another stab at stratum

</pre>

</li>

<li>

<strong><a href="https://gitlab.com/NTPsec/ntpsec/commit/c545691c481dfef6da81e3c856c6389c89169f37">c545691c</a></strong>

<div>

<span>by Paul Theodoropoulos</span>

<i>at 2018-08-08T18:01:15Z</i>

</div>

<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">clarify pool server explanation

</pre>

</li>

<li>

<strong><a href="https://gitlab.com/NTPsec/ntpsec/commit/f2c172b18adac3887c8ba6d32168faeafe8a6fbe">f2c172b1</a></strong>

<div>

<span>by Paul Theodoropoulos</span>

<i>at 2018-08-08T21:20:19Z</i>

</div>

<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">addition typo fixes, cleanup, style adjustments, etc

</pre>

</li>

<li>

<strong><a href="https://gitlab.com/NTPsec/ntpsec/commit/f6b0f34f1089b32ea0e9de4588cff7e0eb79296c">f6b0f34f</a></strong>

<div>

<span>by Paul Theodoropoulos</span>

<i>at 2018-08-08T21:51:10Z</i>

</div>

<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">one more try on "pool" entry

</pre>

</li>

<li>

<strong><a href="https://gitlab.com/NTPsec/ntpsec/commit/7f55413da9592c328c8fe3d681bad515d28c3fec">7f55413d</a></strong>

<div>

<span>by Paul Theodoropoulos</span>

<i>at 2018-08-08T21:54:19Z</i>

</div>

<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">rm final slashes, correct pool url

</pre>

</li>

<li>

<strong><a href="https://gitlab.com/NTPsec/ntpsec/commit/0064dfe9420ee67f80c972c377f2be3960487fc0">0064dfe9</a></strong>

<div>

<span>by Paul Theodoropoulos</span>

<i>at 2018-08-08T22:23:17Z</i>

</div>

<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Merge branch 'textual-fixes'

all fixes in one.

</pre>

</li>

<li>

<strong><a href="https://gitlab.com/NTPsec/ntpsec/commit/0d44c9c07bcf07c17886babb952102a271b5b6e6">0d44c9c0</a></strong>

<div>

<span>by Paul Theodoropoulos</span>

<i>at 2018-08-09T19:26:01Z</i>

</div>

<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">add netdata monitoring

</pre>

</li>

<li>

<strong><a href="https://gitlab.com/NTPsec/ntpsec/commit/c3a9b70472c212196e5479ba435e8a011e69a336">c3a9b704</a></strong>

<div>

<span>by Paul Theodoropoulos</span>

<i>at 2018-08-09T20:07:01Z</i>

</div>

<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">pps textual fixes

</pre>

</li>

<li>

<strong><a href="https://gitlab.com/NTPsec/ntpsec/commit/5f8c9dbbb298d54e080c569cd9abee9a7f315d69">5f8c9dbb</a></strong>

<div>

<span>by Paul Theodoropoulos</span>

<i>at 2018-08-09T21:02:12Z</i>

</div>

<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">please vet temperature commentary, perhaps best elsewhere

</pre>

</li>

<li>

<strong><a href="https://gitlab.com/NTPsec/ntpsec/commit/04ae56fb2ade6ef26bb2056b3d1d872196603af4">04ae56fb</a></strong>

<div>

<span>by Paul Theodoropoulos</span>

<i>at 2018-08-09T21:26:30Z</i>

</div>

<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">typos, wordsmith

</pre>

</li>

<li>

<strong><a href="https://gitlab.com/NTPsec/ntpsec/commit/512b0662c89c41cddd4c6f5234a3689d5d3df218">512b0662</a></strong>

<div>

<span>by Paul Theodoropoulos</span>

<i>at 2018-08-09T21:29:29Z</i>

</div>

<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">add pointer to pool discussion in quick-start

</pre>

</li>

<li>

<strong><a href="https://gitlab.com/NTPsec/ntpsec/commit/864acf4236dda0085ef4055177d81eea03a6425d">864acf42</a></strong>

<div>

<span>by Paul Theodoropoulos</span>

<i>at 2018-08-10T22:56:25Z</i>

</div>

<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">three ways of utilizing pps

</pre>

</li>

<li>

<strong><a href="https://gitlab.com/NTPsec/ntpsec/commit/4476a3eb1175007c103966eeae33a6378dbd736e">4476a3eb</a></strong>

<div>

<span>by Paul Theodoropoulos</span>

<i>at 2018-08-11T00:22:07Z</i>

</div>

<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Merge branch 'master' of gitlab.com:NTPsec/ntpsec

</pre>

</li>

<li>

<strong><a href="https://gitlab.com/NTPsec/ntpsec/commit/80aeb81c040af88dfcca2bf1c23168da1b2ab8b0">80aeb81c</a></strong>

<div>

<span>by Paul Theodoropoulos</span>

<i>at 2018-08-11T00:23:03Z</i>

</div>

<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">add netdata monitoring

</pre>

</li>

<li>

<strong><a href="https://gitlab.com/NTPsec/ntpsec/commit/76a756e9b79f2b3515b212c1fde0cf3fe2ebd2e7">76a756e9</a></strong>

<div>

<span>by Paul Theodoropoulos</span>

<i>at 2018-08-11T00:23:03Z</i>

</div>

<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">pps textual fixes

</pre>

</li>

<li>

<strong><a href="https://gitlab.com/NTPsec/ntpsec/commit/85a81635749a5cd5c93596a87a633d65f8d32ddc">85a81635</a></strong>

<div>

<span>by Paul Theodoropoulos</span>

<i>at 2018-08-11T00:23:03Z</i>

</div>

<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">please vet temperature commentary, perhaps best elsewhere

</pre>

</li>

<li>

<strong><a href="https://gitlab.com/NTPsec/ntpsec/commit/8d7b8cea0fdebdb422b9e1809e81e7bbf8515dc4">8d7b8cea</a></strong>

<div>

<span>by Paul Theodoropoulos</span>

<i>at 2018-08-11T00:23:03Z</i>

</div>

<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">typos, wordsmith

</pre>

</li>

<li>

<strong><a href="https://gitlab.com/NTPsec/ntpsec/commit/2bd61bc8be4defba16da41c1ca3bc09e526dbf75">2bd61bc8</a></strong>

<div>

<span>by Paul Theodoropoulos</span>

<i>at 2018-08-11T00:23:03Z</i>

</div>

<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">add pointer to pool discussion in quick-start

</pre>

</li>

<li>

<strong><a href="https://gitlab.com/NTPsec/ntpsec/commit/b832695e0d40f4a54c48b7e4ca5cb5d3c4a68cd9">b832695e</a></strong>

<div>

<span>by Paul Theodoropoulos</span>

<i>at 2018-08-11T00:23:03Z</i>

</div>

<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">three ways of utilizing pps

</pre>

</li>

<li>

<strong><a href="https://gitlab.com/NTPsec/ntpsec/commit/88079e7169b974754a283aee01f0b9f0249796f4">88079e71</a></strong>

<div>

<span>by Paul Theodoropoulos</span>

<i>at 2018-08-11T00:24:31Z</i>

</div>

<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Merge branch 'more-text-fixes' of gitlab.com:anastrophe/ntpsec into more-text-fixes

</pre>

</li>

</ul>

<h4>6 changed files:</h4>

<ul>

<li class="file-stats">

<a href="#cad3ecba71592ba618b52431231d477ca8dd07c1">

docs/discipline.txt

</a>

</li>

<li class="file-stats">

<a href="#12442c99323575c288c6d8398cecebf864519b20">

docs/ntpspeak.txt

</a>

</li>

<li class="file-stats">

<a href="#da4d6e807e0af214d2ce9dbc483ec7122bcf0a99">

docs/outside-tools.txt

</a>

</li>

<li class="file-stats">

<a href="#827a3ec8d3a2d2c0c717bc4b16ea351ed8a7ca55">

docs/pps.txt

</a>

</li>

<li class="file-stats">

<a href="#ebea0aad8eb647e7aca9e3038677d96185f0ad6a">

docs/quick.txt

</a>

</li>

<li class="file-stats">

<a href="#a4b3179f71939609cb86e36fbc402f8f57ac249c">

docs/rollover.txt

</a>

</li>

</ul>

<h4>Changes:</h4>

<li id="cad3ecba71592ba618b52431231d477ca8dd07c1">

<a href="https://gitlab.com/NTPsec/ntpsec/compare/86de22020e873a542e85364122c52a6c79cdb941...88079e7169b974754a283aee01f0b9f0249796f4#cad3ecba71592ba618b52431231d477ca8dd07c1"><strong>docs/discipline.txt</strong></a>

<hr>

<table class="code white" style="font-family: monospace; font-size: 90%;" bgcolor="#fff" width="100%" cellpadding="0" cellspacing="0">

<tr class="line_holder match" id="" style="line-height: 1.6;">

<td class="diff-line-num unfold js-unfold old_line" data-linenumber="18" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>

<td class="diff-line-num unfold js-unfold new_line" data-linenumber="18" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>

<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -18,8 +18,8 @@ parameter, hybrid phase/frequency-lock feedback loop. It is an</td>

</tr>

<tr class="line_holder" id="" style="line-height: 1.6;">

<td class="diff-line-num old_line" data-linenumber="18" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

18

</td>

<td class="diff-line-num new_line" data-linenumber="18" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

18

</td>

<td class="line_content noteable_line" style="padding-left: 0.5em; padding-right: 0.5em;">

<pre style="margin: 0;"> <span id="LC18" class="line" lang="plaintext">intricately crafted algorithm that automatically adapts for optimum</span>

</pre>

</td>

</tr>

<tr class="line_holder" id="" style="line-height: 1.6;">

<td class="diff-line-num old_line" data-linenumber="19" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

19

</td>

<td class="diff-line-num new_line" data-linenumber="19" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

19

</td>

<td class="line_content noteable_line" style="padding-left: 0.5em; padding-right: 0.5em;">

<pre style="margin: 0;"> <span id="LC19" class="line" lang="plaintext">performance while minimizing network overhead. Operation is in two</span>

</pre>

</td>

</tr>

<tr class="line_holder" id="" style="line-height: 1.6;">

<td class="diff-line-num old_line" data-linenumber="20" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

20

</td>

<td class="diff-line-num new_line" data-linenumber="20" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

20

</td>

<td class="line_content noteable_line" style="padding-left: 0.5em; padding-right: 0.5em;">

<pre style="margin: 0;"> <span id="LC20" class="line" lang="plaintext">modes, phase-lock loop (PLL), which is used at poll intervals below the</span>

</pre>

</td>

</tr>

<tr class="line_holder old" id="" style="line-height: 1.6;">

<td class="diff-line-num old old_line" data-linenumber="21" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

21

</td>

<td class="diff-line-num new_line old" data-linenumber="21" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

</td>

<td class="line_content noteable_line old" style="padding-left: 0.5em; padding-right: 0.5em;" bgcolor="#fbe9eb">

<pre style="margin: 0;">-<span id="LC21" class="line" lang="plaintext">Allan intercept<span class="idiff left right">, by default 2048 s, and frequency-lock loop (FLL), which</span></span>

</pre>

</td>

</tr>

<tr class="line_holder old" id="" style="line-height: 1.6;">

<td class="diff-line-num old old_line" data-linenumber="22" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

22

</td>

<td class="diff-line-num new_line old" data-linenumber="21" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

</td>

<td class="line_content noteable_line old" style="padding-left: 0.5em; padding-right: 0.5em;" bgcolor="#fbe9eb">

<pre style="margin: 0;">-<span id="LC22" class="line" lang="plaintext">is used above that.</span>

</pre>

</td>

</tr>

<tr class="line_holder new" id="" style="line-height: 1.6;">

<td class="diff-line-num new old_line" data-linenumber="23" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

</td>

<td class="diff-line-num new new_line" data-linenumber="21" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

21

</td>

<td class="line_content new noteable_line" style="padding-left: 0.5em; padding-right: 0.5em;" bgcolor="#ecfdf0">

<pre style="margin: 0;">+<span id="LC21" class="line" lang="plaintext">Allan intercept<span class="idiff left right"> - by default 2048 s - and frequency-lock loop (FLL),</span></span>

</pre>

</td>

</tr>

<tr class="line_holder new" id="" style="line-height: 1.6;">

<td class="diff-line-num new old_line" data-linenumber="23" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

</td>

<td class="diff-line-num new new_line" data-linenumber="22" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

22

</td>

<td class="line_content new noteable_line" style="padding-left: 0.5em; padding-right: 0.5em;" bgcolor="#ecfdf0">

<pre style="margin: 0;">+<span id="LC22" class="line" lang="plaintext"><span class="idiff left right">which </span>is used above that.</span>

</pre>

</td>

</tr>

<tr class="line_holder" id="" style="line-height: 1.6;">

<td class="diff-line-num old_line" data-linenumber="23" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

23

</td>

<td class="diff-line-num new_line" data-linenumber="23" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

23

</td>

<td class="line_content noteable_line" style="padding-left: 0.5em; padding-right: 0.5em;">

<pre style="margin: 0;"> <span id="LC23" class="line" lang="plaintext"></span>

</pre>

</td>

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<pre style="margin: 0;"> <span id="LC24" class="line" lang="plaintext">image::pic/discipline.gif[align="center"]</span>

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<pre style="margin: 0;"> <span id="LC25" class="line" lang="plaintext"></span>

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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -70,7 +70,7 @@ intervals are expressed as exponents of 2. By construction, the time</td>

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<pre style="margin: 0;"> <span id="LC70" class="line" lang="plaintext">constant exponent is five times the poll interval exponent. Thus, the</span>

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<pre style="margin: 0;"> <span id="LC71" class="line" lang="plaintext">default poll exponent of 6 corresponds to a poll interval of 64 s and a</span>

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<pre style="margin: 0;"> <span id="LC72" class="line" lang="plaintext">time constant of 2048 s. A change in the poll interval changes the time</span>

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<pre style="margin: 0;">-<span id="LC73" class="line" lang="plaintext">constant by a corresponding amount.<span class="idiff left right">.</span> The Nyquist criterion requires the</span>

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<pre style="margin: 0;">+<span id="LC73" class="line" lang="plaintext">constant by a corresponding amount. The Nyquist criterion requires the</span>

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<pre style="margin: 0;"> <span id="LC74" class="line" lang="plaintext">sample interval to be not more than half the time constant or 1024 s.</span>

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<pre style="margin: 0;"> <span id="LC75" class="line" lang="plaintext">The clock filter guarantees at least one sample in eight poll intervals,</span>

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<pre style="margin: 0;"> <span id="LC76" class="line" lang="plaintext">so the sample interval is not more than 512 s. This would be described</span>

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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="133" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>

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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -133,8 +133,9 @@ If left running continuously, an NTP client on a fast LAN in a home or</td>

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<pre style="margin: 0;"> <span id="LC133" class="line" lang="plaintext">office environment can maintain synchronization nominally within one</span>

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<pre style="margin: 0;"> <span id="LC134" class="line" lang="plaintext">millisecond. When the ambient temperature variations are less than a</span>

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<pre style="margin: 0;"> <span id="LC135" class="line" lang="plaintext">degree Celsius, the clock oscillator frequency is disciplined to within</span>

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<pre style="margin: 0;">-<span id="LC136" class="line" lang="plaintext">one part per million (PPM), even when the clock oscillator native</span>

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<pre style="margin: 0;">-<span id="LC137" class="line" lang="plaintext">frequency offset is 100 PPM or more.</span>

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<pre style="margin: 0;">+<span id="LC136" class="line" lang="plaintext">one part per million (PPM), even when the clock oscillator native frequency</span>

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<pre style="margin: 0;">+<span id="LC137" class="line" lang="plaintext">offset is 100 PPM or more. A temperature-compensated crystal oscillator,</span>

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<pre style="margin: 0;">+<span id="LC138" class="line" lang="plaintext">if available, will be even less affected by thermal influences.</span>

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<pre style="margin: 0;"> <span id="LC139" class="line" lang="plaintext"></span>

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<pre style="margin: 0;"> <span id="LC140" class="line" lang="plaintext">For laptops and portable devices when the power is turned off, the</span>

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<pre style="margin: 0;"> <span id="LC141" class="line" lang="plaintext">battery backup clock offset error can increase as much as one second per</span>

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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="143" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>

<td class="diff-line-num unfold js-unfold new_line" data-linenumber="144" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>

<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -143,7 +144,7 @@ offset and oscillator frequency errors must be resolved by the clock</td>

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<pre style="margin: 0;"> <span id="LC144" class="line" lang="plaintext">discipline algorithm, but this can take several hours without specific</span>

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<pre style="margin: 0;"> <span id="LC145" class="line" lang="plaintext">provisions.</span>

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<pre style="margin: 0;"> <span id="LC146" class="line" lang="plaintext"></span>

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<pre style="margin: 0;">-<span id="LC146" class="line" lang="plaintext">The provisions described in this section <span class="idiff left right">i</span>nsure that, in all but</span>

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<pre style="margin: 0;">+<span id="LC147" class="line" lang="plaintext">The provisions described in this section <span class="idiff left right">e</span>nsure that, in all but</span>

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<pre style="margin: 0;"> <span id="LC148" class="line" lang="plaintext">pathological situations, the startup transient is suppressed to within</span>

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<pre style="margin: 0;"> <span id="LC149" class="line" lang="plaintext">nominal levels in no more than five minutes after a warm start or ten</span>

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<pre style="margin: 0;"> <span id="LC150" class="line" lang="plaintext">minutes after a cold start. Following is a summary of these provisions.</span>

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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="180" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>

<td class="diff-line-num unfold js-unfold new_line" data-linenumber="181" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>

<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -180,7 +181,7 @@ clock. The +iburst+ option of the link:assoc.html#burst[+server+]</td>

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<pre style="margin: 0;"> <span id="LC181" class="line" lang="plaintext">command changes the behavior at restart and is recommended for</span>

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<pre style="margin: 0;"> <span id="LC182" class="line" lang="plaintext">client/server configurations. When this option is enabled, the client</span>

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<pre style="margin: 0;"> <span id="LC183" class="line" lang="plaintext">sends a volley of six requests at intervals of two seconds. This usually</span>

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<pre style="margin: 0;">-<span id="LC183" class="line" lang="plaintext"><span class="idiff left right">i</span>nsures a reliable estimate is available in about ten seconds before</span>

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<pre style="margin: 0;">+<span id="LC184" class="line" lang="plaintext"><span class="idiff left right">e</span>nsures a reliable estimate is available in about ten seconds before</span>

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<pre style="margin: 0;"> <span id="LC185" class="line" lang="plaintext">setting the clock. Once this initial volley is complete, the procedures</span>

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<pre style="margin: 0;"> <span id="LC186" class="line" lang="plaintext">described above are executed.</span>

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<pre style="margin: 0;"> <span id="LC187" class="line" lang="plaintext"></span>

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<li id="12442c99323575c288c6d8398cecebf864519b20">

<a href="https://gitlab.com/NTPsec/ntpsec/compare/86de22020e873a542e85364122c52a6c79cdb941...88079e7169b974754a283aee01f0b9f0249796f4#12442c99323575c288c6d8398cecebf864519b20"><strong>docs/ntpspeak.txt</strong></a>

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<pre style="margin: 0;"> <span id="LC10" class="line" lang="plaintext">[[ACTS]] ACTS::</span>

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<pre style="margin: 0;"> <span id="LC11" class="line" lang="plaintext">  https://www.nist.gov/pml/time-and-frequency-division/services/automated-computer-time-service-acts[NIST</span>

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<pre style="margin: 0;"> <span id="LC12" class="line" lang="plaintext">  Automated Computer Time Service]. NIST provides a civil time reference for</span>

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<pre style="margin: 0;">-<span id="LC13" class="line" lang="plaintext">  computers equipped with analog modems that can dial to its phone</span>

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<pre style="margin: 0;">+<span id="LC13" class="line" lang="plaintext">  computers equipped with analog modems that can dial <span class="idiff left right">in </span>to its phone</span>

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<pre style="margin: 0;"> <span id="LC14" class="line" lang="plaintext">  lines.  Due to variability of delays in the analog phone network</span>

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<pre style="margin: 0;"> <span id="LC15" class="line" lang="plaintext">  accuracy is not very good, around 4 milliseconds compared to</span>

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<pre style="margin: 0;"> <span id="LC16" class="line" lang="plaintext">  around a microsecond for <<PPS>>. But the service is still</span>

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<pre style="margin: 0;"> <span id="LC45" class="line" lang="plaintext">  nominal frequency. It changes, slowly, in response to environmental</span>

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<pre style="margin: 0;"> <span id="LC46" class="line" lang="plaintext">  factors (mainly ambient temperature). ntpd measures drift by</span>

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<pre style="margin: 0;"> <span id="LC47" class="line" lang="plaintext">  sampling the clock and performing clock recovery against a</span>

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<pre style="margin: 0;">-<span id="LC48" class="line" lang="plaintext">  phase-locked loop.  The drift measurement <span class="idiff left right">is occasionally stor</span>ed</span>

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<pre style="margin: 0;">+<span id="LC48" class="line" lang="plaintext">  phase-locked loop.  The drift measurement <span class="idiff left right">can be stored and updat</span>ed</span>

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<pre style="margin: 0;"> <span id="LC49" class="line" lang="plaintext">  locally to a drift file so that when ntpd is stopped and restarted</span>

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<pre style="margin: 0;"> <span id="LC50" class="line" lang="plaintext">  it doesn't have to go through the entire resampling and resynchronization</span>

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<pre style="margin: 0;"> <span id="LC51" class="line" lang="plaintext">  process before providing reliable time.</span>

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<pre style="margin: 0;"> <span id="LC52" class="line" lang="plaintext"></span>

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<pre style="margin: 0;"> <span id="LC53" class="line" lang="plaintext">[[falseticker]] falseticker::</span>

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<pre style="margin: 0;"> <span id="LC54" class="line" lang="plaintext">  <<Mills-speak>> for a timeserver identified as not</span>

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<pre style="margin: 0;">-<span id="LC55" class="line" lang="plaintext">  reliable by statistical filtering.  Usually this does not imply a<span class="idiff left right">ny</span></span>

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<pre style="margin: 0;">+<span id="LC55" class="line" lang="plaintext">  reliable by statistical filtering.  Usually this does not imply a</span>

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<pre style="margin: 0;"> <span id="LC56" class="line" lang="plaintext">  problem with the timeserver itself but rather with highly variable</span>

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<pre style="margin: 0;"> <span id="LC57" class="line" lang="plaintext">  and asymmetric network delays between server and client, but firmware</span>

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<pre style="margin: 0;"> <span id="LC58" class="line" lang="plaintext">  bugs in GPS receivers have produced falsetickers.</span>

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<pre style="margin: 0;"> <span id="LC64" class="line" lang="plaintext">  definitions; notably, the Unix epoch is 1970-00-00T00:00:00.</span>

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<pre style="margin: 0;"> <span id="LC65" class="line" lang="plaintext"></span>

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<pre style="margin: 0;"> <span id="LC66" class="line" lang="plaintext">[[era]] era::</span>

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<pre style="margin: 0;">-<span id="LC67" class="line" lang="plaintext">  One complete revolution of a<span class="idiff left right"> 64-bit</span> NTP 64-bit timestamp; approximately</span>

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<pre style="margin: 0;">+<span id="LC67" class="line" lang="plaintext">  One complete revolution of a<span class="idiff left right">n</span> NTP 64-bit timestamp; approximately</span>

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<pre style="margin: 0;"> <span id="LC68" class="line" lang="plaintext">  136 years. Eras are numbered from 0, but this era number is not</span>

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<pre style="margin: 0;"> <span id="LC69" class="line" lang="plaintext">  represented internally in NTP code because modular-arithmetic</span>

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<pre style="margin: 0;"> <span id="LC70" class="line" lang="plaintext">  trickery is used to deduce the nearest time that could fit a given</span>

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<pre style="margin: 0;"> <span id="LC87" class="line" lang="plaintext">   now long gone, but have left a few traces in the NTP codebase.</span>

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<pre style="margin: 0;"> <span id="LC88" class="line" lang="plaintext"></span>

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<pre style="margin: 0;"> <span id="LC89" class="line" lang="plaintext">[[GPS]] GPS::</span>

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<pre style="margin: 0;">-<span id="LC90" class="line" lang="plaintext">   Global Positioning System; <span class="idiff left right">also,</span> "a GPS" is a radio receiver</span>

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<pre style="margin: 0;">+<span id="LC90" class="line" lang="plaintext">   Global Positioning System; <span class="idiff left right">in common parlance</span> "a GPS" is a radio receiver</span>

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<pre style="margin: 0;"> <span id="LC91" class="line" lang="plaintext">   designed to get position and time fixes from the system. GPS fixes</span>

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<pre style="margin: 0;"> <span id="LC92" class="line" lang="plaintext">   are derived from spherical trigonometry using the precisely known</span>

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<pre style="margin: 0;"> <span id="LC93" class="line" lang="plaintext">   positions of satellites in a geocentric coordinate system. GPS</span>

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<pre style="margin: 0;"> <span id="LC94" class="line" lang="plaintext">   also provides time service; those that emit <<PPS>> are suitable</span>

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<pre style="margin: 0;"> <span id="LC95" class="line" lang="plaintext">   as clock sources for Stratum 1 timeservers.  In timekeeping, the</span>

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<pre style="margin: 0;">-<span id="LC96" class="line" lang="plaintext">   term is used to refer not only to the <span class="idiff left right">US original</span> GPS system,</span>

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<pre style="margin: 0;">+<span id="LC96" class="line" lang="plaintext">   term is used to refer not only to the <span class="idiff left right">original U.S.</span> GPS system,</span>

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<pre style="margin: 0;"> <span id="LC97" class="line" lang="plaintext">   but newer constellations that work on the same principles, such</span>

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<pre style="margin: 0;"> <span id="LC98" class="line" lang="plaintext">   as ГЛОНАСС (the Russian GLONASS), 北斗 (the Chinese BeiDou-2),</span>

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<pre style="margin: 0;"> <span id="LC99" class="line" lang="plaintext">   and the EU's Galileo.</span>

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<pre style="margin: 0;"> <span id="LC108" class="line" lang="plaintext">   GPS antenna.</span>

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<pre style="margin: 0;"> <span id="LC109" class="line" lang="plaintext"></span>

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<pre style="margin: 0;"> <span id="LC110" class="line" lang="plaintext">[[GPSD]] GPSD::</span>

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<pre style="margin: 0;">-<span id="LC111" class="line" lang="plaintext">   The http://www.catb.org/gpsd<span class="idiff left right">/</span>[GPS Daemon], an open-source device</span>

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<pre style="margin: 0;">+<span id="LC111" class="line" lang="plaintext">   The http://www.catb.org/gpsd[GPS Daemon], an open-source device</span>

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<pre style="margin: 0;"> <span id="LC112" class="line" lang="plaintext">   manager for GPSes and other geodetic sensors. Frequently used as</span>

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<pre style="margin: 0;"> <span id="LC113" class="line" lang="plaintext">   a clock source by Stratum 1 sites via the link:driver_shm.html[SHM]</span>

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<pre style="margin: 0;"> <span id="LC114" class="line" lang="plaintext">   interface.</span>

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<pre style="margin: 0;"> <span id="LC140" class="line" lang="plaintext">   serial link is called "in-band time" to contrast it with the</span>

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<pre style="margin: 0;"> <span id="LC141" class="line" lang="plaintext">   out-of-band <<PPS>> signal.  Abbreviated IBT. Seldom useful</span>

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<pre style="margin: 0;"> <span id="LC142" class="line" lang="plaintext">   by itself as it tends to have a large random wander from top</span>

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<pre style="margin: 0;">-<span id="LC143" class="line" lang="plaintext">   of second. <span class="idiff left right"> It is however,</span> useful as a count of seconds.</span>

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<pre style="margin: 0;">+<span id="LC143" class="line" lang="plaintext">   of second. <span class="idiff left right">However, it is</span> useful as a count of seconds.</span>

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<pre style="margin: 0;"> <span id="LC144" class="line" lang="plaintext"></span>

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<pre style="margin: 0;"> <span id="LC145" class="line" lang="plaintext">[[leap second]] leap second::</span>

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<pre style="margin: 0;"> <span id="LC146" class="line" lang="plaintext">   Because the earth's rotation varies in irregular ways (gradually</span>

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<pre style="margin: 0;">-<span id="LC147" class="line" lang="plaintext">   slowing due to tidal drag<span class="idiff left right">) and the second is now defined in</span></span>

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<pre style="margin: 0;">-<span id="LC148" class="line" lang="plaintext">   absolute terms rather than as a fraction of day length, keeping</span>

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<pre style="margin: 0;">+<span id="LC147" class="line" lang="plaintext">   slowing due to tidal drag<span class="idiff left right"> among other forces) and the second is now defined</span></span>

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<pre style="margin: 0;">+<span id="LC148" class="line" lang="plaintext">   <span class="idiff left right">in </span>absolute terms rather than as a fraction of day length, keeping</span>

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<pre style="margin: 0;"> <span id="LC149" class="line" lang="plaintext">   time of day synchronized with mean solar time requires occasional,</span>

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<pre style="margin: 0;"> <span id="LC150" class="line" lang="plaintext">   unpredictable insertions of a standard second in the calendar. Leap</span>

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<pre style="margin: 0;"> <span id="LC151" class="line" lang="plaintext">   second notifications are issued as Bulletin C by the</span>

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<pre style="margin: 0;">-<span id="LC152" class="line" lang="plaintext">   http://www.iers.org/IERS/EN/Home/home_node.html[International</span>

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<pre style="margin: 0;">+<span id="LC152" class="line" lang="plaintext">   http<span class="idiff left right">s</span>://www.iers.org/IERS/EN/Home/home_node.html[International</span>

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<pre style="margin: 0;"> <span id="LC153" class="line" lang="plaintext">   Earth Rotation Service] when required, and obeyed by national time</span>

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<pre style="margin: 0;"> <span id="LC154" class="line" lang="plaintext">   authorities.  The current leap-second offset is automatically</span>

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<pre style="margin: 0;"> <span id="LC155" class="line" lang="plaintext">   propagated through the <<GPS>> system.</span>

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<pre style="margin: 0;"> <span id="LC169" class="line" lang="plaintext">   include <<falseticker>>, <<proventic>>, and <<truechimer>>.  The</span>

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<pre style="margin: 0;"> <span id="LC170" class="line" lang="plaintext">   close-to-definitive reference is</span>

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<pre style="margin: 0;"> <span id="LC171" class="line" lang="plaintext">   https://lists.ntp.org/pipermail/questions/2007-December/016592.html[The</span>

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<pre style="margin: 0;">-<span id="LC172" class="line" lang="plaintext">   NTP dictionary], though not all those terms are still in use.</span>

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<pre style="margin: 0;">+<span id="LC172" class="line" lang="plaintext">   NTP dictionary], though not all <span class="idiff left right">of </span>those terms are still in use.</span>

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<pre style="margin: 0;"> <span id="LC173" class="line" lang="plaintext"></span>

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<pre style="margin: 0;"> <span id="LC174" class="line" lang="plaintext">[[mode 6]] mode 6::</span>

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<pre style="margin: 0;"> <span id="LC175" class="line" lang="plaintext">   Mode 6 is a control protocol used to get various kinds of</span>

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<pre style="margin: 0;"> <span id="LC176" class="line" lang="plaintext">   status information from a running ntpd and configure it on</span>

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<pre style="margin: 0;">-<span id="LC177" class="line" lang="plaintext">   the fly.  So<span class="idiff left right"> </span>called from the value 6 (0110) in the packet mode</span>

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<pre style="margin: 0;">+<span id="LC177" class="line" lang="plaintext">   the fly.  So<span class="idiff left right">-</span>called from the value 6 (0110) in the packet mode</span>

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<pre style="margin: 0;"> <span id="LC178" class="line" lang="plaintext">   field.  It is described in detail mode6.html[here].</span>

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<pre style="margin: 0;"> <span id="LC179" class="line" lang="plaintext"></span>

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<pre style="margin: 0;"> <span id="LC180" class="line" lang="plaintext">[[NIST]] NIST::</span>

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<pre style="margin: 0;">-<span id="LC181" class="line" lang="plaintext">   http<span class="idiff left right">://www.nist.gov/</span>[National Institute of Standards and</span>

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<pre style="margin: 0;">-<span id="LC182" class="line" lang="plaintext">   Technology].  The civilian national time authority of the U<span class="idiff left right">SA</span>;</span>

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<pre style="margin: 0;">+<span id="LC181" class="line" lang="plaintext">   http<span class="idiff left right">s://www.nist.gov</span>[National Institute of Standards and</span>

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<pre style="margin: 0;">+<span id="LC182" class="line" lang="plaintext">   Technology].  The civilian national time authority of the U<span class="idiff left right">.S.</span>;</span>

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<pre style="margin: 0;"> <span id="LC183" class="line" lang="plaintext">   runs <<WWVB>>.  Responsible for keeping U.S. civil time</span>

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<pre style="margin: 0;"> <span id="LC184" class="line" lang="plaintext">   coordinated with UTC.  Civil <<NIST>> and military <<USNO>></span>

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<pre style="margin: 0;"> <span id="LC185" class="line" lang="plaintext">   time agree to within nanoseconds.</span>

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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -187,7 +187,7 @@</td>

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<pre style="margin: 0;"> <span id="LC187" class="line" lang="plaintext">[[NTP-classic]] NTP Classic::</span>

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<pre style="margin: 0;"> <span id="LC188" class="line" lang="plaintext">   The original reference implementation of NTP by Dave Mills, later</span>

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<pre style="margin: 0;"> <span id="LC189" class="line" lang="plaintext">   maintained by the Network Time Foundation.  It is available at</span>

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<pre style="margin: 0;">-<span id="LC190" class="line" lang="plaintext">   http://www.ntp.org<span class="idiff left right">/</span> .  NTPsec forked from it on June 6th, 2015.</span>

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<pre style="margin: 0;">+<span id="LC190" class="line" lang="plaintext">   http://www.ntp.org .  NTPsec forked from it on June 6th, 2015.</span>

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<pre style="margin: 0;"> <span id="LC191" class="line" lang="plaintext"></span>

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<pre style="margin: 0;"> <span id="LC192" class="line" lang="plaintext">[[nonce]] nonce::</span>

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<pre style="margin: 0;"> <span id="LC193" class="line" lang="plaintext">  An arbitrary number that may only be used once. A random or</span>

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<pre style="margin: 0;"> <span id="LC229" class="line" lang="plaintext"></span>

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<pre style="margin: 0;"> <span id="LC230" class="line" lang="plaintext">[[pool]] pool::</span>

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<pre style="margin: 0;"> <span id="LC231" class="line" lang="plaintext">   In an NTP context, "the pool" is usually the</span>

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<td class="diff-line-num old old_line" data-linenumber="232" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

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<td class="diff-line-num new_line old" data-linenumber="232" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

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<pre style="margin: 0;">-<span id="LC232" class="line" lang="plaintext">   http://www.pool.ntp.org/en/[NTP Pool Project], a collection of</span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="233" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

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<td class="diff-line-num new_line old" data-linenumber="232" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

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<pre style="margin: 0;">-<span id="LC233" class="line" lang="plaintext">   thousands of NTP servers accessible through DNS servers that hand</span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="234" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

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<pre style="margin: 0;">-<span id="LC234" class="line" lang="plaintext">   out "nearby" server addresses from the pool.  These servers are</span>

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<td class="diff-line-num old old_line" data-linenumber="235" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

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<pre style="margin: 0;">-<span id="LC235" class="line" lang="plaintext">   usually run by volunteers, and available via well-known DNS names.</span>

</pre>

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<td class="diff-line-num new old_line" data-linenumber="236" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

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<td class="diff-line-num new new_line" data-linenumber="232" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

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<pre style="margin: 0;">+<span id="LC232" class="line" lang="plaintext">   https://www.ntppool.org/en[NTP Pool Project], a collection of</span>

</pre>

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<td class="diff-line-num new old_line" data-linenumber="236" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

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<td class="diff-line-num new new_line" data-linenumber="233" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

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<pre style="margin: 0;">+<span id="LC233" class="line" lang="plaintext">   thousands of NTP servers around the world that you can use to keep</span>

</pre>

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<td class="diff-line-num new old_line" data-linenumber="236" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

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<pre style="margin: 0;">+<span id="LC234" class="line" lang="plaintext">   time. The DNS names are designed to keep the timeservers you select</span>

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<td class="diff-line-num new old_line" data-linenumber="236" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

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<td class="diff-line-num new new_line" data-linenumber="235" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

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<pre style="margin: 0;">+<span id="LC235" class="line" lang="plaintext">   relatively "close" to you on the internet, with varying degrees of</span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="236" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

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<pre style="margin: 0;">+<span id="LC236" class="line" lang="plaintext">   specificity, e.g. using north-america.pool.ntp.org may connect you</span>

</pre>

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<td class="diff-line-num new old_line" data-linenumber="236" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

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<td class="diff-line-num new new_line" data-linenumber="237" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

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<pre style="margin: 0;">+<span id="LC237" class="line" lang="plaintext">   to timeservers from Canada to Panama, while us.pool.ntp.org is more</span>

</pre>

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<td class="diff-line-num new old_line" data-linenumber="236" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

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<td class="diff-line-num new new_line" data-linenumber="238" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

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<pre style="margin: 0;">+<span id="LC238" class="line" lang="plaintext">   likely to connect you to timeservers within the continental U.S..</span>

</pre>

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<td class="diff-line-num new old_line" data-linenumber="236" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

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<td class="diff-line-num new new_line" data-linenumber="239" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

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<pre style="margin: 0;">+<span id="LC239" class="line" lang="plaintext">   These pool timeservers are usually run by volunteers. See</span>

</pre>

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<pre style="margin: 0;">+<span id="LC240" class="line" lang="plaintext">   the https://docs.ntpsec.org/latest/quick.html#pool[Quick Start for</span>

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<pre style="margin: 0;">+<span id="LC241" class="line" lang="plaintext">   Client Configurations] for a more in-depth discussion of pools.</span>

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<pre style="margin: 0;"> <span id="LC242" class="line" lang="plaintext"></span>

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<pre style="margin: 0;"> <span id="LC243" class="line" lang="plaintext">[[proventic]] proventic:: <<Mills-speak>> for "the transitive</span>

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<pre style="margin: 0;"> <span id="LC244" class="line" lang="plaintext">  completion of the authentication relationship", defined in RFC 5906.</span>

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<pre style="margin: 0;"> <span id="LC253" class="line" lang="plaintext"></span>

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<pre style="margin: 0;"> <span id="LC254" class="line" lang="plaintext">[[stratum]] stratum::</span>

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<pre style="margin: 0;"> <span id="LC255" class="line" lang="plaintext">  A "stratum" is a layer in the hierarchy of time servers.  A</span>

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<pre style="margin: 0;">-<span id="LC250" class="line" lang="plaintext">  <<refclock>> is <span class="idiff left right">considered </span>stratum 0; a computer directly attached to</span>

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<pre style="margin: 0;">+<span id="LC256" class="line" lang="plaintext">  <<refclock>> is stratum 0; a computer directly attached to</span>

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<pre style="margin: 0;"> <span id="LC257" class="line" lang="plaintext">  a refclock is stratum 1; and a client served by a stratum N is</span>

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<pre style="margin: 0;"> <span id="LC258" class="line" lang="plaintext">  stratum N+1. Often capitalized, especially when referring to all</span>

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<pre style="margin: 0;">-<span id="LC253" class="line" lang="plaintext">  members of a stratum. While strata up to 15 are defined, it is</span>

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<pre style="margin: 0;">-<span id="LC254" class="line" lang="plaintext">  unusual to see a public timeserver with stratum greater than 3,</span>

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<pre style="margin: 0;">-<span id="LC255" class="line" lang="plaintext">  and thus almost all NTP clients are at Stratum 4 or lower.</span>

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<pre style="margin: 0;">-<span id="LC256" class="line" lang="plaintext">  Notice that a 'lower' stratum is closer to the reference clock than</span>

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<pre style="margin: 0;">-<span id="LC257" class="line" lang="plaintext">  a 'higher'.</span>

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<pre style="margin: 0;">+<span id="LC259" class="line" lang="plaintext">  members of a stratum. The larger the number, the further away from</span>

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<pre style="margin: 0;">+<span id="LC260" class="line" lang="plaintext">  the source clock, thus the less accurate. Stratum 16 is the maximum, and</span>

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<pre style="margin: 0;">+<span id="LC261" class="line" lang="plaintext">  indicates a device that is unreachable and unsynchronized. The majority</span>

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<pre style="margin: 0;">+<span id="LC262" class="line" lang="plaintext">  of public timeservers are Stratum 1 and Stratum 2.</span>

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<pre style="margin: 0;"> <span id="LC263" class="line" lang="plaintext"></span>

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<pre style="margin: 0;"> <span id="LC264" class="line" lang="plaintext">[[time-radio]] time radio::</span>

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<pre style="margin: 0;"> <span id="LC265" class="line" lang="plaintext">  A radio receiver specialized for picking up accurate time reference</span>

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<pre style="margin: 0;"> <span id="LC280" class="line" lang="plaintext">  the server itself than it is of favorable network topology.</span>

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<pre style="margin: 0;"> <span id="LC281" class="line" lang="plaintext"></span>

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<pre style="margin: 0;"> <span id="LC282" class="line" lang="plaintext">[[USNO]] USNO::</span>

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<pre style="margin: 0;">-<span id="LC278" class="line" lang="plaintext">  http://www.usno.navy.mil/USNO[The United States Naval Observatory],</span>

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<pre style="margin: 0;">+<span id="LC283" class="line" lang="plaintext">  http<span class="idiff left right">s</span>://www.usno.navy.mil/USNO[The United States Naval Observatory],</span>

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<pre style="margin: 0;"> <span id="LC284" class="line" lang="plaintext">  one of the two U.S. national time authorities and the source of the</span>

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<pre style="margin: 0;"> <span id="LC285" class="line" lang="plaintext">  U.S. military time reference, now delivered primarily by GPS</span>

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<pre style="margin: 0;"> <span id="LC286" class="line" lang="plaintext">  signals. U.S. civil <<NIST>> and military <<USNO>> time agree to</span>

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<br>

</li>

<li id="da4d6e807e0af214d2ce9dbc483ec7122bcf0a99">

<a href="https://gitlab.com/NTPsec/ntpsec/compare/86de22020e873a542e85364122c52a6c79cdb941...88079e7169b974754a283aee01f0b9f0249796f4#da4d6e807e0af214d2ce9dbc483ec7122bcf0a99"><strong>docs/outside-tools.txt</strong></a>

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<pre style="margin: 0;"> <span id="LC17" class="line" lang="plaintext">* link:#introduction[Introduction]</span>

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<pre style="margin: 0;"> <span id="LC18" class="line" lang="plaintext">* link:#wireshark[Wireshark]</span>

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<pre style="margin: 0;"> <span id="LC19" class="line" lang="plaintext">* link:#nagios[Nagios]</span>

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<pre style="margin: 0;">+<span id="LC20" class="line" lang="plaintext">* link:#netdata[Netdata]</span>

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<pre style="margin: 0;"> <span id="LC21" class="line" lang="plaintext"></span>

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<pre style="margin: 0;"> <span id="LC22" class="line" lang="plaintext">'''''</span>

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<pre style="margin: 0;"> <span id="LC23" class="line" lang="plaintext"></span>

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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -42,6 +43,13 @@ The https://www.nagios.org/[Nagios] monitoring suite has native</td>

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<pre style="margin: 0;"> <span id="LC43" class="line" lang="plaintext">support for querying NTP servers.  The 'check_ntp_peer' and</span>

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<pre style="margin: 0;"> <span id="LC44" class="line" lang="plaintext">'check_ntp_time' programs may be of particular interest.</span>

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<pre style="margin: 0;"> <span id="LC45" class="line" lang="plaintext"></span>

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<pre style="margin: 0;">+<span id="LC46" class="line" lang="plaintext">[[netdata]]</span>

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<pre style="margin: 0;">+<span id="LC47" class="line" lang="plaintext">== Netdata ==</span>

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<pre style="margin: 0;">+<span id="LC48" class="line" lang="plaintext"></span>

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<pre style="margin: 0;">+<span id="LC49" class="line" lang="plaintext">The https://github.com/firehol/netdata/wiki[Netdata] monitoring</span>

</pre>

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<pre style="margin: 0;">+<span id="LC50" class="line" lang="plaintext">solution has native support for realtime monitoring of ntpd,</span>

</pre>

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<pre style="margin: 0;">+<span id="LC51" class="line" lang="plaintext">among a vast number of other system metrics. </span>

</pre>

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<pre style="margin: 0;">+<span id="LC52" class="line" lang="plaintext"></span>

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<pre style="margin: 0;"> <span id="LC53" class="line" lang="plaintext">'''''</span>

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<pre style="margin: 0;"> <span id="LC54" class="line" lang="plaintext"></span>

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<pre style="margin: 0;"> <span id="LC55" class="line" lang="plaintext">include::includes/footer.txt[]</span></pre>

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<br>

</li>

<li id="827a3ec8d3a2d2c0c717bc4b16ea351ed8a7ca55">

<a href="https://gitlab.com/NTPsec/ntpsec/compare/86de22020e873a542e85364122c52a6c79cdb941...88079e7169b974754a283aee01f0b9f0249796f4#827a3ec8d3a2d2c0c717bc4b16ea351ed8a7ca55"><strong>docs/pps.txt</strong></a>

<hr>

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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -67,24 +67,24 @@ driver, and may be added to other drivers in future.  Alternatively,</td>

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<pre style="margin: 0;"> <span id="LC67" class="line" lang="plaintext">the PPS driver described on the link:driver_pps.html[PPS Clock</span>

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<pre style="margin: 0;"> <span id="LC68" class="line" lang="plaintext">Discipline] page can be used. It operates in conjunction with another</span>

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<pre style="margin: 0;"> <span id="LC69" class="line" lang="plaintext">source that provides seconds numbering. The selected source is</span>

</pre>

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<pre style="margin: 0;">-<span id="LC70" class="line" lang="plaintext">designate<span class="idiff left right"> a prefer peer, as</span> using the +prefer+ option, as described on</span>

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<td class="diff-line-num new old_line" data-linenumber="71" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

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<pre style="margin: 0;">+<span id="LC70" class="line" lang="plaintext">designate<span class="idiff left right">d as a 'prefer peer'</span> using the +prefer+ option, as described on</span>

</pre>

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<pre style="margin: 0;"> <span id="LC71" class="line" lang="plaintext">the link:prefer.html[Mitigation Rules and the +prefer+ Keyword]</span>

</pre>

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<pre style="margin: 0;"> <span id="LC72" class="line" lang="plaintext">page. The prefer peer is ordinarily the radio clock that provides the</span>

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<pre style="margin: 0;"> <span id="LC73" class="line" lang="plaintext">PPS signal, but in principle another radio clock or even a remote</span>

</pre>

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<pre style="margin: 0;">-<span id="LC74" class="line" lang="plaintext">Internet server could be designated preferred Note that the +pps+</span>

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<pre style="margin: 0;">+<span id="LC74" class="line" lang="plaintext">Internet server could be designated preferred<span class="idiff left right">.</span> Note that the +pps+</span>

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<pre style="margin: 0;"> <span id="LC75" class="line" lang="plaintext">configuration command has been obsoleted by this driver.</span>

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<pre style="margin: 0;"> <span id="LC76" class="line" lang="plaintext"></span>

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<pre style="margin: 0;"> <span id="LC77" class="line" lang="plaintext">[[use]]</span>

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<pre style="margin: 0;"> <span id="LC78" class="line" lang="plaintext">== Using the Pulse-per-Second (PPS) Signal ==</span>

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<pre style="margin: 0;"> <span id="LC79" class="line" lang="plaintext"></span>

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<pre style="margin: 0;">-<span id="LC80" class="line" lang="plaintext">The PPS signal can be used in <span class="idiff left right">either of two ways, one</span> using the NTP</span>

</pre>

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<pre style="margin: 0;">-<span id="LC81" class="line" lang="plaintext">grooming and mitigation algorithms<span class="idiff left right"> and the othe</span>r using the kernel PPS</span>

</pre>

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<pre style="margin: 0;">+<span id="LC80" class="line" lang="plaintext">The PPS signal can be used in <span class="idiff left right">three ways:</span> using the NTP</span>

</pre>

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<pre style="margin: 0;">+<span id="LC81" class="line" lang="plaintext">grooming and mitigation algorithms<span class="idiff left right">, o</span>r using the kernel PPS</span>

</pre>

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<pre style="margin: 0;"> <span id="LC82" class="line" lang="plaintext">signal support described in the link:kern.html[Kernel Model for</span>

</pre>

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<pre style="margin: 0;">-<span id="LC83" class="line" lang="plaintext">Precision Timekeeping] page<span class="idiff left right">. The presence of  kernel support is</span></span>

</pre>

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<pre style="margin: 0;">-<span id="LC84" class="line" lang="plaintext"><span class="idiff left right">automatically detected during the NTP build process and supporting code</span></span>

</pre>

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<pre style="margin: 0;">-<span id="LC85" class="line" lang="plaintext"><span class="idiff left right">automatically compiled. In either case, the PPS signal must be present</span></span>

</pre>

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<pre style="margin: 0;">-<span id="LC86" class="line" lang="plaintext"><span class="idiff left right">and within nominal jitter and wander tolerances. In addition, the prefer</span></span>

</pre>

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<pre style="margin: 0;">-<span id="LC87" class="line" lang="plaintext">peer must be a truechimer; that is, survive the sanity checks and</span>

</pre>

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<pre style="margin: 0;">+<span id="LC83" class="line" lang="plaintext">Precision Timekeeping] page<span class="idiff left right">, or via the shared-memory interface. The presence</span></span>

</pre>

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<pre style="margin: 0;">+<span id="LC84" class="line" lang="plaintext"><span class="idiff left right">of  kernel support is automatically detected during the NTP build process and</span></span>

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<pre style="margin: 0;">+<span id="LC85" class="line" lang="plaintext"><span class="idiff left right">supporting code automatically compiled. Regardles of mechanism, the PPS signal</span></span>

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<pre style="margin: 0;">+<span id="LC86" class="line" lang="plaintext"><span class="idiff left right">must be present and within nominal jitter and wander tolerances. Additionally,</span></span>

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<pre style="margin: 0;">+<span id="LC87" class="line" lang="plaintext"><span class="idiff left right">the prefer </span>peer must be a truechimer; that is, survive the sanity checks and</span>

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<pre style="margin: 0;"> <span id="LC88" class="line" lang="plaintext">intersection algorithm. Finally, the offset of the system clock relative</span>

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<pre style="margin: 0;"> <span id="LC89" class="line" lang="plaintext">to the prefer peer must be within ±0.5 s. The kernel maintains a</span>

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<pre style="margin: 0;"> <span id="LC90" class="line" lang="plaintext">watchdog timer for the PPS signal; if the signal has not been heard or</span>

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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -92,11 +92,12 @@ is out of tolerance for more than some interval, currently two minutes,</td>

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<pre style="margin: 0;"> <span id="LC92" class="line" lang="plaintext">the kernel discipline is disabled and operation continues as if it were</span>

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<pre style="margin: 0;"> <span id="LC93" class="line" lang="plaintext">not present.</span>

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<pre style="margin: 0;"> <span id="LC94" class="line" lang="plaintext"></span>

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<pre style="margin: 0;">-<span id="LC95" class="line" lang="plaintext">An option flag in the driver determines whether the NTP algorithms or</span>

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<pre style="margin: 0;">-<span id="LC96" class="line" lang="plaintext">kernel support is enabled (if available). For historical reasons, the</span>

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<pre style="margin: 0;">-<span id="LC97" class="line" lang="plaintext">NTP algorithms are selected by default, since performance is</span>

</pre>

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<pre style="margin: 0;">-<span id="LC98" class="line" lang="plaintext">generally better using older, slower systems. However, performance is</span>

</pre>

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<td class="diff-line-num new_line old" data-linenumber="95" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

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<pre style="margin: 0;">-<span id="LC99" class="line" lang="plaintext">generally better with kernel support using newer, faster systems.</span>

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<pre style="margin: 0;">+<span id="LC95" class="line" lang="plaintext">An option flag in the driver determines whether the NTP algorithms, the</span>

</pre>

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<pre style="margin: 0;">+<span id="LC96" class="line" lang="plaintext">kernel support, or the shared-memory interface is enabled (depending upon</span>

</pre>

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<pre style="margin: 0;">+<span id="LC97" class="line" lang="plaintext">availability). For historical reasons, the NTP algorithms are selected by</span>

</pre>

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<pre style="margin: 0;">+<span id="LC98" class="line" lang="plaintext">default, since performance is generally better when using older, slower</span>

</pre>

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<pre style="margin: 0;">+<span id="LC99" class="line" lang="plaintext">systems. However, performance is generally better with kernel support or</span>

</pre>

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<pre style="margin: 0;">+<span id="LC100" class="line" lang="plaintext">shared-memory support when using newer, faster systems.</span>

</pre>

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<td class="diff-line-num new_line" data-linenumber="101" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

101

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<pre style="margin: 0;"> <span id="LC101" class="line" lang="plaintext"></span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="101" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

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<td class="diff-line-num new_line" data-linenumber="102" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

102

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<pre style="margin: 0;"> <span id="LC102" class="line" lang="plaintext">'''''</span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="102" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

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<td class="diff-line-num new_line" data-linenumber="103" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

103

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<pre style="margin: 0;"> <span id="LC103" class="line" lang="plaintext"></span>

</pre>

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</table>

<br>

</li>

<li id="ebea0aad8eb647e7aca9e3038677d96185f0ad6a">

<a href="https://gitlab.com/NTPsec/ntpsec/compare/86de22020e873a542e85364122c52a6c79cdb941...88079e7169b974754a283aee01f0b9f0249796f4#ebea0aad8eb647e7aca9e3038677d96185f0ad6a"><strong>docs/quick.txt</strong></a>

<hr>

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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="51" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>

<td class="diff-line-num unfold js-unfold new_line" data-linenumber="51" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>

<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -51,7 +51,7 @@ address-allocation time to use the NTP servers provided by DHCP.</td>

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51

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51

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<td class="line_content noteable_line" style="padding-left: 0.5em; padding-right: 0.5em;">

<pre style="margin: 0;"> <span id="LC51" class="line" lang="plaintext"></span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="52" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

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<pre style="margin: 0;"> <span id="LC52" class="line" lang="plaintext">NTPsec, unlike legacy versions, can also be configured using an</span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="53" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

53

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<td class="diff-line-num new_line" data-linenumber="53" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

53

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<td class="line_content noteable_line" style="padding-left: 0.5em; padding-right: 0.5em;">

<pre style="margin: 0;"> <span id="LC53" class="line" lang="plaintext">Apache-style directory /etc/ntp.d of configuration-file segments.</span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="54" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

54

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<td class="diff-line-num new_line old" data-linenumber="54" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

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<pre style="margin: 0;">-<span id="LC54" class="line" lang="plaintext">This is intended to make li<span class="idiff left right">k</span>e easier for software configurators, which</span>

</pre>

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<td class="diff-line-num new old_line" data-linenumber="55" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

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<td class="diff-line-num new new_line" data-linenumber="54" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

54

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<pre style="margin: 0;">+<span id="LC54" class="line" lang="plaintext">This is intended to make li<span class="idiff left right">f</span>e easier for software configurators, which</span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="55" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

55

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<td class="diff-line-num new_line" data-linenumber="55" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

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<pre style="margin: 0;"> <span id="LC55" class="line" lang="plaintext">can write independent segments rather than having to do the kind of</span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="56" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

56

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<td class="diff-line-num new_line" data-linenumber="56" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

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<td class="line_content noteable_line" style="padding-left: 0.5em; padding-right: 0.5em;">

<pre style="margin: 0;"> <span id="LC56" class="line" lang="plaintext">edit-in-place on a flat ntp.conf that comes naturally to a human.</span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="57" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

57

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57

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<pre style="margin: 0;"> <span id="LC57" class="line" lang="plaintext"></span>

</pre>

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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="127" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>

<td class="diff-line-num unfold js-unfold new_line" data-linenumber="127" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>

<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -127,8 +127,8 @@ server 2.ubuntu.pool.ntp.org</td>

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<td class="diff-line-num old_line" data-linenumber="127" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

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<pre style="margin: 0;"> <span id="LC127" class="line" lang="plaintext">server 3.ubuntu.pool.ntp.org</span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="128" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

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<td class="diff-line-num new_line" data-linenumber="128" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

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<pre style="margin: 0;"> <span id="LC128" class="line" lang="plaintext">------------------------------------------------------------------</span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="129" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

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<pre style="margin: 0;"> <span id="LC129" class="line" lang="plaintext"></span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="130" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

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<td class="diff-line-num new_line old" data-linenumber="130" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

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<td class="line_content noteable_line old" style="padding-left: 0.5em; padding-right: 0.5em;" bgcolor="#fbe9eb">

<pre style="margin: 0;">-<span id="LC130" class="line" lang="plaintext">Multiple declarations of individual pool servers <span class="idiff left right">are not the best you can</span></span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="131" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

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<td class="diff-line-num new_line old" data-linenumber="130" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

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<td class="line_content noteable_line old" style="padding-left: 0.5em; padding-right: 0.5em;" bgcolor="#fbe9eb">

<pre style="margin: 0;">-<span id="LC131" class="line" lang="plaintext"><span class="idiff left right">do</span>; they're a workaround for a historical bug in NTP Classic.  It's</span>

</pre>

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<td class="diff-line-num new old_line" data-linenumber="132" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

</td>

<td class="diff-line-num new new_line" data-linenumber="130" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

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<pre style="margin: 0;">+<span id="LC130" class="line" lang="plaintext">Multiple declarations of individual pool servers <span class="idiff left right">is not the best</span></span>

</pre>

</td>

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<td class="diff-line-num new old_line" data-linenumber="132" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

</td>

<td class="diff-line-num new new_line" data-linenumber="131" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

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<pre style="margin: 0;">+<span id="LC131" class="line" lang="plaintext"><span class="idiff left right">method</span>; they're a workaround for a historical bug in NTP Classic.  It's</span>

</pre>

</td>

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<td class="diff-line-num old_line" data-linenumber="132" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

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<pre style="margin: 0;"> <span id="LC132" class="line" lang="plaintext">better to say</span>

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<pre style="margin: 0;"> <span id="LC133" class="line" lang="plaintext"></span>

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<pre style="margin: 0;"> <span id="LC134" class="line" lang="plaintext">------------------------------------------------------------------</span>

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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="227" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>

<td class="diff-line-num unfold js-unfold new_line" data-linenumber="227" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>

<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -227,7 +227,7 @@ accurate time, provided it has link:ntpspeak.html[PPS] capability.</td>

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<pre style="margin: 0;"> <span id="LC227" class="line" lang="plaintext">want check servers from the pool.)</span>

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<pre style="margin: 0;"> <span id="LC228" class="line" lang="plaintext"></span>

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<pre style="margin: 0;"> <span id="LC229" class="line" lang="plaintext">The easiest way to arrange this is by installing</span>

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<pre style="margin: 0;">-<span id="LC230" class="line" lang="plaintext">http://catb.org/gpsd<span class="idiff left right">/</span>[GPSD] to watch the GPS, and configuring your</span>

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<pre style="margin: 0;">+<span id="LC230" class="line" lang="plaintext">http://catb.org/gpsd[GPSD] to watch the GPS, and configuring your</span>

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<pre style="margin: 0;"> <span id="LC231" class="line" lang="plaintext">+ntpd+ to accept time from it.  It is also possible to do this with</span>

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<pre style="margin: 0;"> <span id="LC232" class="line" lang="plaintext">native +ntpd+ drivers (nmea, trimble, oncore), though these are less</span>

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<pre style="margin: 0;"> <span id="LC233" class="line" lang="plaintext">flexible and a bit more difficult to configure.</span>

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<br>

</li>

<li id="a4b3179f71939609cb86e36fbc402f8f57ac249c">

<a href="https://gitlab.com/NTPsec/ntpsec/compare/86de22020e873a542e85364122c52a6c79cdb941...88079e7169b974754a283aee01f0b9f0249796f4#a4b3179f71939609cb86e36fbc402f8f57ac249c"><strong>docs/rollover.txt</strong></a>

<hr>

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<td class="diff-line-num unfold js-unfold new_line" data-linenumber="22" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>

<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -22,26 +22,26 @@ lifetime of the universe (or whatever portion of it concerns you).</td>

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<pre style="margin: 0;"> <span id="LC22" class="line" lang="plaintext">On real-world hardware you will seldom be that lucky.</span>

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<pre style="margin: 0;"> <span id="LC23" class="line" lang="plaintext"></span>

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<pre style="margin: 0;"> <span id="LC24" class="line" lang="plaintext">This page discusses calendar cycles related to NTP, the ways they</span>

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<pre style="margin: 0;">-<span id="LC25" class="line" lang="plaintext">interact, the consequences of rollover<span class="idiff left right">,</span> and common workarounds for</span>

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<pre style="margin: 0;">+<span id="LC25" class="line" lang="plaintext">interact, the consequences of rollover and common workarounds for</span>

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<pre style="margin: 0;"> <span id="LC26" class="line" lang="plaintext">rollover problems.</span>

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<pre style="margin: 0;"> <span id="LC27" class="line" lang="plaintext"></span>

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<pre style="margin: 0;"> <span id="LC28" class="line" lang="plaintext">[[terminology]]</span>

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<pre style="margin: 0;"> <span id="LC29" class="line" lang="plaintext">== Terminology ==</span>

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30

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<td class="line_content noteable_line" style="padding-left: 0.5em; padding-right: 0.5em;">

<pre style="margin: 0;"> <span id="LC30" class="line" lang="plaintext"></span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="31" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

31

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<td class="diff-line-num new_line" data-linenumber="31" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

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<td class="line_content noteable_line" style="padding-left: 0.5em; padding-right: 0.5em;">

<pre style="margin: 0;"> <span id="LC31" class="line" lang="plaintext">Every calendar cycle has at least three basic properties: a start date</span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="32" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

32

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<td class="diff-line-num new_line old" data-linenumber="32" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

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<td class="line_content noteable_line old" style="padding-left: 0.5em; padding-right: 0.5em;" bgcolor="#fbe9eb">

<pre style="margin: 0;">-<span id="LC32" class="line" lang="plaintext">(usually refer<span class="idiff left right">r</span>ed to a solar astronomical date in the Gregorian</span>

</pre>

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<td class="diff-line-num new old_line" data-linenumber="33" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

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<td class="diff-line-num new new_line" data-linenumber="32" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

32

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<td class="line_content new noteable_line" style="padding-left: 0.5em; padding-right: 0.5em;" bgcolor="#ecfdf0">

<pre style="margin: 0;">+<span id="LC32" class="line" lang="plaintext">(usually refer<span class="idiff left right">enc</span>ed to a solar astronomical date in the Gregorian</span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="33" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

33

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<td class="diff-line-num new_line" data-linenumber="33" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

33

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<td class="line_content noteable_line" style="padding-left: 0.5em; padding-right: 0.5em;">

<pre style="margin: 0;"> <span id="LC33" class="line" lang="plaintext">calendar), a unit (such as seconds) and a rollover time or cycle</span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="34" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

34

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<td class="diff-line-num new_line" data-linenumber="34" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

34

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<td class="line_content noteable_line" style="padding-left: 0.5em; padding-right: 0.5em;">

<pre style="margin: 0;"> <span id="LC34" class="line" lang="plaintext">length in that unit.  It also matters what the calendar does about</span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="35" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

35

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<td class="diff-line-num new_line" data-linenumber="35" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

35

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<td class="line_content noteable_line" style="padding-left: 0.5em; padding-right: 0.5em;">

<pre style="margin: 0;"> <span id="LC35" class="line" lang="plaintext">leap seconds.</span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="36" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

36

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<td class="diff-line-num new_line" data-linenumber="36" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

36

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<td class="line_content noteable_line" style="padding-left: 0.5em; padding-right: 0.5em;">

<pre style="margin: 0;"> <span id="LC36" class="line" lang="plaintext"></span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="37" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

37

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<td class="diff-line-num new_line" data-linenumber="37" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

37

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<td class="line_content noteable_line" style="padding-left: 0.5em; padding-right: 0.5em;">

<pre style="margin: 0;"> <span id="LC37" class="line" lang="plaintext">As an important example, the basic time representation used on</span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="38" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

38

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<td class="diff-line-num new_line" data-linenumber="38" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

38

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<td class="line_content noteable_line" style="padding-left: 0.5em; padding-right: 0.5em;">

<pre style="margin: 0;"> <span id="LC38" class="line" lang="plaintext">computers running Unix has a start date of 1970-01-01T00:00:00</span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="39" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

39

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<td class="diff-line-num new_line old" data-linenumber="39" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

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<td class="line_content noteable_line old" style="padding-left: 0.5em; padding-right: 0.5em;" bgcolor="#fbe9eb">

<pre style="margin: 0;">-<span id="LC39" class="line" lang="plaintext">(midnight of Jan<span class="idiff left right">ary 1st 1970), a unit of seconds,</span> and a rollover time</span>

</pre>

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<td class="diff-line-num new old_line" data-linenumber="40" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

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<td class="diff-line-num new new_line" data-linenumber="39" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

39

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<td class="line_content new noteable_line" style="padding-left: 0.5em; padding-right: 0.5em;" bgcolor="#ecfdf0">

<pre style="margin: 0;">+<span id="LC39" class="line" lang="plaintext">(midnight of Jan<span class="idiff left right">uary 1st 1970), a unit of seconds</span> and a rollover time</span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="40" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

40

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<td class="diff-line-num new_line" data-linenumber="40" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

40

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<td class="line_content noteable_line" style="padding-left: 0.5em; padding-right: 0.5em;">

<pre style="margin: 0;"> <span id="LC40" class="line" lang="plaintext">of either 2^31^ seconds or 2^63^ seconds, depending on the word size</span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="41" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

41

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<td class="diff-line-num new_line" data-linenumber="41" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

41

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<td class="line_content noteable_line" style="padding-left: 0.5em; padding-right: 0.5em;">

<pre style="margin: 0;"> <span id="LC41" class="line" lang="plaintext">of the hardware. Negative times represent seconds before the start</span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="42" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

42

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<td class="diff-line-num new_line" data-linenumber="42" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

42

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<td class="line_content noteable_line" style="padding-left: 0.5em; padding-right: 0.5em;">

<pre style="margin: 0;"> <span id="LC42" class="line" lang="plaintext">date.</span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="43" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

43

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<td class="diff-line-num new_line" data-linenumber="43" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

43

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<td class="line_content noteable_line" style="padding-left: 0.5em; padding-right: 0.5em;">

<pre style="margin: 0;"> <span id="LC43" class="line" lang="plaintext"></span>

</pre>

</td>

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<td class="diff-line-num old old_line" data-linenumber="44" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

44

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<td class="diff-line-num new_line old" data-linenumber="44" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

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<td class="line_content noteable_line old" style="padding-left: 0.5em; padding-right: 0.5em;" bgcolor="#fbe9eb">

<pre style="margin: 0;">-<span id="LC44" class="line" lang="plaintext">The start date is often called the "epoch"<span class="idiff left right">,</span> and a rollover period may</span>

</pre>

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<td class="diff-line-num new old_line" data-linenumber="45" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

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<td class="diff-line-num new new_line" data-linenumber="44" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

44

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<td class="line_content new noteable_line" style="padding-left: 0.5em; padding-right: 0.5em;" bgcolor="#ecfdf0">

<pre style="margin: 0;">+<span id="LC44" class="line" lang="plaintext">The start date is often called the "epoch" and a rollover period may</span>

</pre>

</td>

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<td class="diff-line-num old_line" data-linenumber="45" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

45

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<td class="diff-line-num new_line" data-linenumber="45" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

45

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<td class="line_content noteable_line" style="padding-left: 0.5em; padding-right: 0.5em;">

<pre style="margin: 0;"> <span id="LC45" class="line" lang="plaintext">be called an "era". Beware that eras are often numbered zero-origin;</span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="46" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

46

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<td class="diff-line-num new_line" data-linenumber="46" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

46

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<td class="line_content noteable_line" style="padding-left: 0.5em; padding-right: 0.5em;">

<pre style="margin: 0;"> <span id="LC46" class="line" lang="plaintext">it is likely that Unix software will refer to dates immediately before</span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="47" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

47

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<td class="diff-line-num new_line" data-linenumber="47" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

47

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<td class="line_content noteable_line" style="padding-left: 0.5em; padding-right: 0.5em;">

<pre style="margin: 0;"> <span id="LC47" class="line" lang="plaintext">the 2038 rollover as "era 0", not "era 1".</span>

</pre>

</td>

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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -65,7 +65,7 @@ are so often used as primary time sources).</td>

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<pre style="margin: 0;"> <span id="LC65" class="line" lang="plaintext"></span>

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<pre style="margin: 0;"> <span id="LC66" class="line" lang="plaintext">A well-known historical rollover problem was "Y2K", which derived from</span>

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<pre style="margin: 0;"> <span id="LC67" class="line" lang="plaintext">the use of two-digit decimal year counters in mainframe software</span>

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<pre style="margin: 0;">-<span id="LC68" class="line" lang="plaintext">(written when storage was so <span class="idiff left right">extensive</span> that longer counters would have</span>

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<pre style="margin: 0;">+<span id="LC68" class="line" lang="plaintext">(written when storage was so <span class="idiff left right">limited</span> that longer counters would have</span>

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<pre style="margin: 0;"> <span id="LC69" class="line" lang="plaintext">been dramatically more expensive). Expensive preparation and</span>

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<pre style="margin: 0;"> <span id="LC70" class="line" lang="plaintext">mitigation work prevented any major disasters in the year 2000, but</span>

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<pre style="margin: 0;"> <span id="LC71" class="line" lang="plaintext">this was in part because there were many fewer vulnerable systems than</span>

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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="91" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>

<td class="diff-line-num unfold js-unfold new_line" data-linenumber="91" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>

<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -91,7 +91,7 @@ such as Spectracom's "Type 2".</td>

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<pre style="margin: 0;"> <span id="LC91" class="line" lang="plaintext">There is an internal workaround to deal with two-digit dates in</span>

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<pre style="margin: 0;"> <span id="LC92" class="line" lang="plaintext">{ntpdman}, but it relies on the system clock being at least roughly</span>

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<pre style="margin: 0;"> <span id="LC93" class="line" lang="plaintext">correct - it won't work (for example) at boot time if the clock</span>

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<pre style="margin: 0;">-<span id="LC94" class="line" lang="plaintext">has been trashed or zeroed due to a failed battery backup<span class="idiff left right">,</span> and</span>

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<pre style="margin: 0;">+<span id="LC94" class="line" lang="plaintext">has been trashed or zeroed due to a failed battery backup and</span>

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<pre style="margin: 0;"> <span id="LC95" class="line" lang="plaintext">you have no remote check peers yet.</span>

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<td class="diff-line-num old_line" data-linenumber="96" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

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<pre style="margin: 0;"> <span id="LC96" class="line" lang="plaintext"></span>

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<td class="diff-line-num old_line" data-linenumber="97" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

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<pre style="margin: 0;"> <span id="LC97" class="line" lang="plaintext">Warnings have been attached to the documentation of NTP clock drivers</span>

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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="118" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>

<td class="diff-line-num unfold js-unfold new_line" data-linenumber="118" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>

<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -118,7 +118,7 @@ The possibility of stutter or skip also means that in order to compute</td>

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<pre style="margin: 0;"> <span id="LC118" class="line" lang="plaintext">elapsed time in seconds between two Unix times, you need to know</span>

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<pre style="margin: 0;"> <span id="LC119" class="line" lang="plaintext">the leap-second offset at each time.  It is not guaranteed that</span>

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<pre style="margin: 0;"> <span id="LC120" class="line" lang="plaintext">these offsets are the same if the interval crosses midnight  at the</span>

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<pre style="margin: 0;">-<span id="LC121" class="line" lang="plaintext">end of any calendar month. To date in 201<span class="idiff left right">7</span>,  IERS (the International</span>

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<pre style="margin: 0;">+<span id="LC121" class="line" lang="plaintext">end of any calendar month. To date in 201<span class="idiff left right">8</span>,  IERS (the International</span>

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<pre style="margin: 0;"> <span id="LC122" class="line" lang="plaintext">Earth Rotation service) has performed all corrections just after</span>

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<pre style="margin: 0;"> <span id="LC123" class="line" lang="plaintext">midnight of June 31 and December 31 respectively.</span>

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<pre style="margin: 0;"> <span id="LC124" class="line" lang="plaintext"></span>

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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -183,8 +183,8 @@ to compose this with message data to report time at subsecond</td>

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<pre style="margin: 0;"> <span id="LC183" class="line" lang="plaintext">precision.  Many, however, do not, and those that do are often</span>

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<pre style="margin: 0;"> <span id="LC184" class="line" lang="plaintext">inaccurate; consumer-grade hardware often has jitter of over a tenth</span>

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<pre style="margin: 0;"> <span id="LC185" class="line" lang="plaintext">of a second (100ms). On the other hand, carefully designed GPSes</span>

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<pre style="margin: 0;">-<span id="LC186" class="line" lang="plaintext">easily deliver 1ms accuracy, and some do <span class="idiff left right">20 times better than that.  A</span></span>

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<pre style="margin: 0;">-<span id="LC187" class="line" lang="plaintext">more detailed discussion of accuracy budgets see the</span>

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<pre style="margin: 0;">+<span id="LC186" class="line" lang="plaintext">easily deliver 1ms accuracy, and some do <span class="idiff left right">1000 times better than that. For</span></span>

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<pre style="margin: 0;">+<span id="LC187" class="line" lang="plaintext"><span class="idiff left right">a </span>more detailed discussion of accuracy budgets see the</span>

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<pre style="margin: 0;"> <span id="LC188" class="line" lang="plaintext">http://www.catb.org/gpsd/time-service-intro.html[Introduction to Time</span>

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<pre style="margin: 0;"> <span id="LC189" class="line" lang="plaintext">Service].</span>

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<pre style="margin: 0;"> <span id="LC190" class="line" lang="plaintext"></span>

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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="212" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>

<td class="diff-line-num unfold js-unfold new_line" data-linenumber="212" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>

<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -212,11 +212,11 @@ but rather the behavior near GPS and century rollovers.</td>

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<pre style="margin: 0;"> <span id="LC212" class="line" lang="plaintext">To yield a UTC date, the weeks+second information from the GPS satellites</span>

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<pre style="margin: 0;"> <span id="LC213" class="line" lang="plaintext">has to be used as an offset to a base date.</span>

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<pre style="margin: 0;"> <span id="LC214" class="line" lang="plaintext"></span>

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<pre style="margin: 0;">-<span id="LC215" class="line" lang="plaintext">The most naive way to do this would to simply use the zero date of the</span>

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<td class="diff-line-num new new_line" data-linenumber="215" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

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<pre style="margin: 0;">+<span id="LC215" class="line" lang="plaintext">The most naive way to do this would <span class="idiff left right">be </span>to simply use the zero date of the</span>

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<pre style="margin: 0;"> <span id="LC216" class="line" lang="plaintext">current GPS era (1024-week cycle) as the base.  Some very early GPS</span>

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<td class="diff-line-num old_line" data-linenumber="217" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

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<pre style="margin: 0;"> <span id="LC217" class="line" lang="plaintext">equipment seems to have worked this way, but it has the drawback that</span>

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<pre style="margin: 0;"> <span id="LC218" class="line" lang="plaintext">the device time-warps at the next GPS era rollover - which, if your</span>

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<pre style="margin: 0;">-<span id="LC219" class="line" lang="plaintext">device first ship<span class="idiff left right"> is only a few years before that rollover,</span> is a</span>

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<pre style="margin: 0;">+<span id="LC219" class="line" lang="plaintext">device first ship<span class="idiff left right">ped only a few years before that rollover -</span> is a</span>

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<pre style="margin: 0;"> <span id="LC220" class="line" lang="plaintext">serious drawback.</span>

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<pre style="margin: 0;"> <span id="LC221" class="line" lang="plaintext"></span>

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<pre style="margin: 0;"> <span id="LC222" class="line" lang="plaintext">There is a relatively simple way to extend the useful life of a GPS</span>

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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="224" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>

<td class="diff-line-num unfold js-unfold new_line" data-linenumber="224" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>

<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -224,7 +224,7 @@ used as a clock. That is to choose a pivot date in GPS weeks.  When</td>

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<pre style="margin: 0;"> <span id="LC224" class="line" lang="plaintext">your device reports a week number *before* the pivot, you assume that</span>

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<pre style="margin: 0;"> <span id="LC225" class="line" lang="plaintext">a GPS rollover has occurred and add 1024 weeks to the base date.</span>

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<pre style="margin: 0;"> <span id="LC226" class="line" lang="plaintext"></span>

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<pre style="margin: 0;">-<span id="LC227" class="line" lang="plaintext">This technique will postpone<span class="idiff left right">s</span> time-warping to a full 1024 weeks after</span>

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<td class="diff-line-num new new_line" data-linenumber="227" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

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<pre style="margin: 0;">+<span id="LC227" class="line" lang="plaintext">This technique will postpone time-warping to a full 1024 weeks after</span>

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<pre style="margin: 0;"> <span id="LC228" class="line" lang="plaintext">the pivot date - which the vendor typically makes the release date</span>

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<pre style="margin: 0;"> <span id="LC229" class="line" lang="plaintext">of the device firmware.  But it won't do any better than that; without the</span>

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<pre style="margin: 0;"> <span id="LC230" class="line" lang="plaintext">ability to change the base date, the device will ship incorrect</span>

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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="233" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>

<td class="diff-line-num unfold js-unfold new_line" data-linenumber="233" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>

<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -233,7 +233,7 @@ have that ability; most do not.</td>

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<pre style="margin: 0;"> <span id="LC233" class="line" lang="plaintext"></span>

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<pre style="margin: 0;"> <span id="LC234" class="line" lang="plaintext">This is where careless, low-budget design begins to matter. GPS vendors</span>

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<pre style="margin: 0;"> <span id="LC235" class="line" lang="plaintext">do not document even the fact that they use base or pivot dates, let</span>

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<pre style="margin: 0;">-<span id="LC236" class="line" lang="plaintext">alone what the base and pivot dates for their devices are. As of 201<span class="idiff left right">7</span>,</span>

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<pre style="margin: 0;">+<span id="LC236" class="line" lang="plaintext">alone what the base and pivot dates for their devices are. As of 201<span class="idiff left right">8</span>,</span>

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<pre style="margin: 0;"> <span id="LC237" class="line" lang="plaintext">NTP's developers do not know of any devices for which you can even</span>

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<pre style="margin: 0;"> <span id="LC238" class="line" lang="plaintext">query these parameters, let alone set them.  The best you can generally</span>

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<pre style="margin: 0;"> <span id="LC239" class="line" lang="plaintext">do (and on only some devices) is get the firmware release date; from this,</span>

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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -250,7 +250,7 @@ manager daemon that shares some developers with NTPsec, works around a</td>

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<pre style="margin: 0;"> <span id="LC250" class="line" lang="plaintext">lot of the general messiness, but can't solve this problem</span>

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<pre style="margin: 0;"> <span id="LC251" class="line" lang="plaintext">because the device capabilities to address it are simply absent.</span>

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<pre style="margin: 0;"> <span id="LC252" class="line" lang="plaintext"></span>

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<pre style="margin: 0;">-<span id="LC253" class="line" lang="plaintext">Finally, when you buy a GPS you do not know - and often will not be</span>

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<pre style="margin: 0;">+<span id="LC253" class="line" lang="plaintext">Finally, when you buy a GPS <span class="idiff left right">device, </span>you do not know - and often will not be</span>

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<pre style="margin: 0;"> <span id="LC254" class="line" lang="plaintext">able to discover - how far in the past its hidden pivot date is.  This</span>

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<pre style="margin: 0;"> <span id="LC255" class="line" lang="plaintext">means that time service operators using a GPS as a local Stratum 0</span>

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<pre style="margin: 0;"> <span id="LC256" class="line" lang="plaintext">need to be aware of the possibility that their device could roll over</span>

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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="274" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>

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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -274,9 +274,9 @@ For purposes of this discussion, a 'resolved' timestamp is one that</td>

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<pre style="margin: 0;"> <span id="LC274" class="line" lang="plaintext">has been mapped from a 32-bit seconds offset in some era to a full</span>

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<pre style="margin: 0;"> <span id="LC275" class="line" lang="plaintext">64-bit timestamp implicitly based in some known era.</span>

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<pre style="margin: 0;"> <span id="LC276" class="line" lang="plaintext"></span>

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<pre style="margin: 0;">-<span id="LC277" class="line" lang="plaintext">When {ntpdman} receives a<span class="idiff left right"> unresolved timestamp from an upstream server</span></span>

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<pre style="margin: 0;">+<span id="LC277" class="line" lang="plaintext">When {ntpdman} receives a<span class="idiff left right">n unresolved timestamp from an upstream server,</span></span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="278" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

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<td class="line_content noteable_line" style="padding-left: 0.5em; padding-right: 0.5em;">

<pre style="margin: 0;"> <span id="LC278" class="line" lang="plaintext">that timestamp could be based in any era prior to the current</span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="279" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

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<td class="diff-line-num new_line old" data-linenumber="279" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

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<td class="line_content noteable_line old" style="padding-left: 0.5em; padding-right: 0.5em;" bgcolor="#fbe9eb">

<pre style="margin: 0;">-<span id="LC279" class="line" lang="plaintext">wall-clock date - but<span class="idiff left right">, by definition,</span> we may not know the wall-clock</span>

</pre>

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<td class="diff-line-num new old_line" data-linenumber="280" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

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<td class="diff-line-num new new_line" data-linenumber="279" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

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<pre style="margin: 0;">+<span id="LC279" class="line" lang="plaintext">wall-clock date - but<span class="idiff left right"> by definition</span> we may not know the wall-clock</span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="280" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

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<td class="diff-line-num new_line" data-linenumber="280" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

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<td class="line_content noteable_line" style="padding-left: 0.5em; padding-right: 0.5em;">

<pre style="margin: 0;"> <span id="LC280" class="line" lang="plaintext">date with confidence yet (not having achieved sync).</span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="281" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

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<td class="diff-line-num new_line" data-linenumber="281" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

281

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<pre style="margin: 0;"> <span id="LC281" class="line" lang="plaintext"></span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="282" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

282

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<td class="diff-line-num new_line" data-linenumber="282" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

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<pre style="margin: 0;"> <span id="LC282" class="line" lang="plaintext">To resolve this ambiguity, NTP also uses an internal pivot date.  It</span>

</pre>

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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="289" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>

<td class="diff-line-num unfold js-unfold new_line" data-linenumber="289" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>

<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -289,7 +289,7 @@ is within a half-cycle of a rollover time resolve to either the</td>

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<td class="diff-line-num new_line" data-linenumber="289" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

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<pre style="margin: 0;"> <span id="LC289" class="line" lang="plaintext">previous or the next era.</span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="290" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

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<td class="diff-line-num new_line" data-linenumber="290" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

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<td class="line_content noteable_line" style="padding-left: 0.5em; padding-right: 0.5em;">

<pre style="margin: 0;"> <span id="LC290" class="line" lang="plaintext"></span>

</pre>

</td>

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<td class="diff-line-num old_line" data-linenumber="291" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

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<td class="diff-line-num new_line" data-linenumber="291" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

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<td class="line_content noteable_line" style="padding-left: 0.5em; padding-right: 0.5em;">

<pre style="margin: 0;"> <span id="LC291" class="line" lang="plaintext">An {ntpdman} instance's pivot date will be the date it was compiled</span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="292" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

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<td class="diff-line-num new_line old" data-linenumber="292" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

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<td class="line_content noteable_line old" style="padding-left: 0.5em; padding-right: 0.5em;" bgcolor="#fbe9eb">

<pre style="margin: 0;">-<span id="LC292" class="line" lang="plaintext">and built.<span class="idiff left right">  </span></span>

</pre>

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<td class="diff-line-num new old_line" data-linenumber="293" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

</td>

<td class="diff-line-num new new_line" data-linenumber="292" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

292

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<pre style="margin: 0;">+<span id="LC292" class="line" lang="plaintext">and built.</span>

</pre>

</td>

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<td class="diff-line-num old_line" data-linenumber="293" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

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<td class="diff-line-num new_line" data-linenumber="293" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

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<td class="line_content noteable_line" style="padding-left: 0.5em; padding-right: 0.5em;">

<pre style="margin: 0;"> <span id="LC293" class="line" lang="plaintext"></span>

</pre>

</td>

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<td class="diff-line-num old_line" data-linenumber="294" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

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<td class="diff-line-num new_line" data-linenumber="294" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

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<td class="line_content noteable_line" style="padding-left: 0.5em; padding-right: 0.5em;">

<pre style="margin: 0;"> <span id="LC294" class="line" lang="plaintext">It is fairly easy to see that this guarantees correct resolution if the</span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="295" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

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<td class="diff-line-num new_line" data-linenumber="295" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

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<td class="line_content noteable_line" style="padding-left: 0.5em; padding-right: 0.5em;">

<pre style="margin: 0;"> <span id="LC295" class="line" lang="plaintext">pivot dates of the communicating ntpds are within a half-cycle</span>

</pre>

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