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<h3>
Eric S. Raymond 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/6d39b3ec816ad7499b59bf3b88b4363b58e95158">6d39b3ec</a></strong>
<div>
<span>by Sanjeev Gupta</span>
<i>at 2016-12-24T19:52:02+08:00</i>
</div>
<pre class="commit-message" style="margin: 0; white-space: pre-wrap">Expand definition of GPS to document other GNSS
and let us test UTF-8 !!!
</pre>
</li>
<li>
<strong><a href="https://gitlab.com/NTPsec/ntpsec/commit/3e6dca1c2006c86f1800c192b22fea25b77c0cf6">3e6dca1c</a></strong>
<div>
<span>by Sanjeev Gupta</span>
<i>at 2016-12-24T20:02:19+08:00</i>
</div>
<pre class="commit-message" style="margin: 0; white-space: pre-wrap">Expanding documentation, GPSDO holdover and IERS
</pre>
</li>
<li>
<strong><a href="https://gitlab.com/NTPsec/ntpsec/commit/42a1a0d2f46c97636b567ce5677e6a58b1bc6e0b">42a1a0d2</a></strong>
<div>
<span>by Sanjeev Gupta</span>
<i>at 2016-12-24T20:17:45+08:00</i>
</div>
<pre class="commit-message" style="margin: 0; white-space: pre-wrap">More rewriting and expansion of ntpspeak.txt
</pre>
</li>
<li>
<strong><a href="https://gitlab.com/NTPsec/ntpsec/commit/dac2795f9da9973bf93aa10720bec64812b89100">dac2795f</a></strong>
<div>
<span>by Sanjeev Gupta</span>
<i>at 2016-12-24T20:33:47+08:00</i>
</div>
<pre class="commit-message" style="margin: 0; white-space: pre-wrap">More minor clarifications to ntpspeak
</pre>
</li>
<li>
<strong><a href="https://gitlab.com/NTPsec/ntpsec/commit/a062b4fcb7f40e098086c33f1012ff9835aeaeec">a062b4fc</a></strong>
<div>
<span>by Sanjeev Gupta</span>
<i>at 2016-12-24T21:28:23+08:00</i>
</div>
<pre class="commit-message" style="margin: 0; white-space: pre-wrap">Update location of leapsecond file
and clarify that the eighteen-month insertion is not cannonical
</pre>
</li>
<li>
<strong><a href="https://gitlab.com/NTPsec/ntpsec/commit/91741b6c98fb48f4e5b8d3278ace3b83ee9c925f">91741b6c</a></strong>
<div>
<span>by Sanjeev Gupta</span>
<i>at 2016-12-24T21:52:05+08:00</i>
</div>
<pre class="commit-message" style="margin: 0; white-space: pre-wrap">Clean up documentation, bit-rot
</pre>
</li>
<li>
<strong><a href="https://gitlab.com/NTPsec/ntpsec/commit/e2e164bb45267de5467563e52d20e623d1b3bbc4">e2e164bb</a></strong>
<div>
<span>by Sanjeev Gupta</span>
<i>at 2016-12-24T21:53:15+08:00</i>
</div>
<pre class="commit-message" style="margin: 0; white-space: pre-wrap">Add real documentation of timecode
</pre>
</li>
<li>
<strong><a href="https://gitlab.com/NTPsec/ntpsec/commit/af5851a5552037be122eb1b3e6f85609c91e3ec4">af5851a5</a></strong>
<div>
<span>by Sanjeev Gupta</span>
<i>at 2016-12-24T21:54:26+08:00</i>
</div>
<pre class="commit-message" style="margin: 0; white-space: pre-wrap">Convert links to https, and fix one
</pre>
</li>
<li>
<strong><a href="https://gitlab.com/NTPsec/ntpsec/commit/d98cd88896e9e7a00456594df459f6c93ce13042">d98cd888</a></strong>
<div>
<span>by Sanjeev Gupta</span>
<i>at 2016-12-24T21:56:15+08:00</i>
</div>
<pre class="commit-message" style="margin: 0; white-space: pre-wrap">Merge branch 'master' of https://gitlab.com/NTPsec/ntpsec into DOCS
</pre>
</li>
</ul>
<h4>3 changed files:</h4>
<ul>
<li class="file-stats">
<a href="#81afbd8a6c067a418c239ef67e1f4b5c81fbcad6" style="text-decoration: none">
docs/leap.txt
</a>
</li>
<li class="file-stats">
<a href="#12442c99323575c288c6d8398cecebf864519b20" style="text-decoration: none">
docs/ntpspeak.txt
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<li class="file-stats">
<a href="#00399611f870fb51a3606980ffc24682ecbb9633" style="text-decoration: none">
docs/tf582_4.txt
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</ul>
<h4>Changes:</h4>
<li id="81afbd8a6c067a418c239ef67e1f4b5c81fbcad6">
<a href="https://gitlab.com/NTPsec/ntpsec/compare/8c0b96f059686805b57e8fdb13ccf90e5b8090d3...d98cd88896e9e7a00456594df459f6c93ce13042#81afbd8a6c067a418c239ef67e1f4b5c81fbcad6"><strong>docs/leap.txt</strong></a>
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<pre style="margin: 0"> <span id="LC1" class="line">= Leap Second Processing =</span>
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<pre style="margin: 0"> <span id="LC2" class="line"></span>
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<pre style="margin: 0">-<span id="LC3" class="line">About every eighteen months the International Earth Rotation Service</span>
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<pre style="margin: 0">-<span id="LC4" class="line">(IERS) issues a bulletin announcing the insertion of a leap second in</span>
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<td class="diff-line-num new_line old" data-linenumber="3" style="background: #f9d7dc; border-right-color: #fac5cd; border-right-style: solid; border-right-width: 1px; color: rgba(0,0,0,0.3); padding: 0 5px; text-align: right; width: 35px" align="right" bgcolor="#f9d7dc">
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<pre style="margin: 0">-<span id="LC5" class="line">the Universal Coordinated Time (UTC) timescale. Ordinarily, this happens</span>
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<pre style="margin: 0">-<span id="LC6" class="line">at the end of the last day of June or December; but, in principle, it</span>
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<pre style="margin: 0">-<span id="LC7" class="line">could happen at the end of any month. While these bulletins are</span>
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<pre style="margin: 0">-<span id="LC8" class="line">available on the Internet at http://www.iers.org[www.iers.org], advance</span>
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<pre style="margin: 0">+<span id="LC3" class="line">Every six months the International Earth Rotation Service</span>
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<pre style="margin: 0">+<span id="LC4" class="line">(IERS) issues a bulletin announcing if there will be a leap second in</span>
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<pre style="margin: 0">+<span id="LC5" class="line">the Universal Coordinated Time (UTC) timescale. Historically,</span>
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<pre style="margin: 0">+<span id="LC6" class="line">only insertions have occurred, about every eighteen months. The changes </span>
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<pre style="margin: 0">+<span id="LC7" class="line">have been at the end of the last day of June or December; but, in principle,</span>
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<pre style="margin: 0">+<span id="LC8" class="line">it could happen at the end of any month. While these bulletins are</span>
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<pre style="margin: 0">+<span id="LC9" class="line">available on the Internet at https://www.iers.org[www.iers.org], advance</span>
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<pre style="margin: 0"> <span id="LC10" class="line">notice of leap seconds is also available in signals broadcast from</span>
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<pre style="margin: 0"> <span id="LC11" class="line">national time and frequency stations, in GPS signals and in telephone</span>
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<pre style="margin: 0"> <span id="LC12" class="line">modem services. Many, but not all, reference clocks recognize these</span>
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<td class="line_content match " style="background: #fafafa; color: rgba(0,0,0,0.3); padding-left: 0.5em; padding-right: 0.5em" bgcolor="#fafafa">@@ -31,7 +32,8 @@ of the current month.</td>
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<pre style="margin: 0"> <span id="LC32" class="line"></span>
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<pre style="margin: 0"> <span id="LC33" class="line">When no means are available to determine the leap bits from a reference</span>
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<pre style="margin: 0"> <span id="LC34" class="line">clock or downstratum server, a leapseconds file can be downloaded from</span>
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<pre style="margin: 0">-<span id="LC34" class="line">time.nist.gov and installed using the</span>
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<pre style="margin: 0">+<span id="LC35" class="line">the https://www.ietf.org/timezones/data/leap-seconds.list[IETF]</span>
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<pre style="margin: 0">+<span id="LC36" class="line">and installed using the</span>
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<pre style="margin: 0"> <span id="LC37" class="line">link:miscopt.html#leapfile[leapfile] command. The file includes a list</span>
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<pre style="margin: 0"> <span id="LC38" class="line">of historic leap seconds and the NTP time of insertion. It is parsed by</span>
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<pre style="margin: 0"> <span id="LC39" class="line">the +ntpd+ daemon at startup and the latest leap time saved for future</span>
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<td class="diff-line-num unfold js-unfold new_line" data-linenumber="57" style="background: #fafafa; border-right-color: #f0f0f0; border-right-style: solid; border-right-width: 1px; color: rgba(0,0,0,0.3); padding: 0 5px; text-align: right; width: 35px" align="right" bgcolor="#fafafa">...</td>
<td class="line_content match " style="background: #fafafa; color: rgba(0,0,0,0.3); padding-left: 0.5em; padding-right: 0.5em" bgcolor="#fafafa">@@ -55,8 +57,8 @@ crude hack by setting the clock back one second using the Unix</td>
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<pre style="margin: 0"> <span id="LC57" class="line">Note however that in any case setting the time backwards by one second</span>
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<pre style="margin: 0"> <span id="LC58" class="line">does not actually set the system clock backwards, but effectively stalls</span>
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<pre style="margin: 0"> <span id="LC59" class="line">the clock for one second. These points are expanded in the white paper</span>
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<pre style="margin: 0">-<span id="LC58" class="line">{millshome}leap.html[The NTP Timescale and Leap</span>
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<pre style="margin: 0">-<span id="LC59" class="line"><span class="idiff left right">Seconds]. </span>If the leap timer is less than one day, the leap bits are set</span>
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<pre style="margin: 0">+<span id="LC60" class="line">{millshome}leap.html[The NTP Timescale and Leap<span class="idiff left right"> Seconds].</span></span>
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<pre style="margin: 0">+<span id="LC61" class="line">If the leap timer is less than one day, the leap bits are set</span>
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<pre style="margin: 0"> <span id="LC62" class="line">for dependent servers and clients.</span>
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<pre style="margin: 0"> <span id="LC63" class="line"></span>
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<pre style="margin: 0"> <span id="LC64" class="line">As an additional feature when the NIST leap seconds file is installed,</span>
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<li id="12442c99323575c288c6d8398cecebf864519b20">
<a href="https://gitlab.com/NTPsec/ntpsec/compare/8c0b96f059686805b57e8fdb13ccf90e5b8090d3...d98cd88896e9e7a00456594df459f6c93ce13042#12442c99323575c288c6d8398cecebf864519b20"><strong>docs/ntpspeak.txt</strong></a>
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<td class="line_content match " style="background: #fafafa; color: rgba(0,0,0,0.3); padding-left: 0.5em; padding-right: 0.5em" bgcolor="#fafafa">@@ -75,15 +75,20 @@</td>
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<pre style="margin: 0"> <span id="LC75" class="line"> are derived from spherical trigonometry using the precisely known</span>
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<pre style="margin: 0"> <span id="LC76" class="line"> positions of satellites in a geocentric coordinate system. GPS</span>
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<pre style="margin: 0"> <span id="LC77" class="line"> also provides time service; those that emit <<PPS>> are suitable</span>
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<pre style="margin: 0">-<span id="LC78" class="line"> as clock sources for Stratum 1 timeservers.</span>
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<pre style="margin: 0">+<span id="LC78" class="line"> as clock sources for Stratum 1 timeservers. In timekeeping, the</span>
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<pre style="margin: 0">+<span id="LC79" class="line"> term is used to refer not only to the US original GPS system,</span>
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<pre style="margin: 0">+<span id="LC80" class="line"> but newer constellations that work on the same principles, such</span>
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<pre style="margin: 0">+<span id="LC81" class="line"> as ГЛОНАСС (the Russian GLONASS), 北斗 (the Chinese BeiDou-2),</span>
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<pre style="margin: 0">+<span id="LC82" class="line"> and the EU's Galileo.</span>
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<pre style="margin: 0"> <span id="LC83" class="line"></span>
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<pre style="margin: 0"> <span id="LC84" class="line">[[GPSDO]] GPSDO::</span>
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<pre style="margin: 0"> <span id="LC85" class="line"> GPS Disciplined Oscillator. A good crystal is synchronized to</span>
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<pre style="margin: 0"> <span id="LC86" class="line"> time from a GPS receiver. The combination gets the short term</span>
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<pre style="margin: 0"> <span id="LC87" class="line"> stability of the crystal and the long term stability of GPS.</span>
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<pre style="margin: 0"> <span id="LC88" class="line"> With appropriate firmware, the crystal can be used when the</span>
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<pre style="margin: 0">-<span id="LC85" class="line"> GPS receiver stops working. Most cell towers have GPSDOs.</span>
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<pre style="margin: 0">-<span id="LC86" class="line"> You can usually spot the conical GPS antenna.</span>
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<pre style="margin: 0">+<span id="LC89" class="line"> GPS receiver is temporarily non-operational; see <<holdover>>.</span>
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<pre style="margin: 0">+<span id="LC90" class="line"> Most cell towers have GPSDOs. You can usually spot the conical</span>
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<pre style="margin: 0">+<span id="LC91" class="line"> GPS antenna.</span>
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<pre style="margin: 0"> <span id="LC92" class="line"></span>
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<pre style="margin: 0"> <span id="LC93" class="line">[[GPSD]] GPSD::</span>
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<pre style="margin: 0"> <span id="LC94" class="line"> The http://www.catb.org/gpsd/[GPS Daemon], an open-source device</span>
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<td class="line_content match " style="background: #fafafa; color: rgba(0,0,0,0.3); padding-left: 0.5em; padding-right: 0.5em" bgcolor="#fafafa">@@ -104,7 +109,7 @@</td>
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<pre style="margin: 0"> <span id="LC109" class="line"> serial link is called "in-band time" to contrast it with the</span>
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<pre style="margin: 0"> <span id="LC110" class="line"> out-of-band <<PPS>> signal. Abbreviated IBT. Seldom useful</span>
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<pre style="margin: 0"> <span id="LC111" class="line"> by itself as it tends to have a large random wander from top</span>
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<pre style="margin: 0">-<span id="LC107" class="line"> of second.</span>
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<pre style="margin: 0">+<span id="LC112" class="line"> of second.<span class="idiff left right"> It is however, useful as a count of seconds.</span></span>
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<pre style="margin: 0"> <span id="LC113" class="line"></span>
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<pre style="margin: 0"> <span id="LC114" class="line">[[leap second]] leap second::</span>
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<pre style="margin: 0"> <span id="LC115" class="line"> Because the earth's rotation varies in irregular ways (gradually</span>
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<td class="line_content match " style="background: #fafafa; color: rgba(0,0,0,0.3); padding-left: 0.5em; padding-right: 0.5em" bgcolor="#fafafa">@@ -112,8 +117,8 @@</td>
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<pre style="margin: 0"> <span id="LC117" class="line"> absolute terms rather than as a fraction of day length, keeping</span>
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<pre style="margin: 0"> <span id="LC118" class="line"> time of day synchronized with mean solar time requires occasional,</span>
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<pre style="margin: 0"> <span id="LC119" class="line"> unpredictable insertions of a standard second in the calendar. Leap</span>
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<pre style="margin: 0">-<span id="LC115" class="line"> second notifications are issued <span class="idiff left right">by IERS</span></span>
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<pre style="margin: 0">-<span id="LC116" class="line"> <span class="idiff left right">(</span>http://www.iers.org/IERS/EN/Home/home_node.html[International</span>
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<pre style="margin: 0">+<span id="LC120" class="line"> second notifications are issued <span class="idiff left right">as Bulletin C by the</span></span>
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<pre style="margin: 0">+<span id="LC121" class="line"> http://www.iers.org/IERS/EN/Home/home_node.html[International</span>
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<pre style="margin: 0"> <span id="LC122" class="line"> Earth Rotation Service] when required, and obeyed by national time</span>
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<pre style="margin: 0"> <span id="LC123" class="line"> authorities. The current leap-second offset is automatically</span>
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<pre style="margin: 0"> <span id="LC124" class="line"> propagated through the <<GPS>> system.</span>
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<td class="line_content match " style="background: #fafafa; color: rgba(0,0,0,0.3); padding-left: 0.5em; padding-right: 0.5em" bgcolor="#fafafa">@@ -121,7 +126,7 @@</td>
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<pre style="margin: 0"> <span id="LC126" class="line">[[leapfile]] leapfile::</span>
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<pre style="margin: 0"> <span id="LC127" class="line"> A local file containing the current <<leap second>> offset, typically</span>
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<pre style="margin: 0"> <span id="LC128" class="line"> fetched from <<USNO>> or <<NIST>> and potentially needing updates</span>
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<pre style="margin: 0">-<span id="LC124" class="line"> near the <span class="idiff left right">very beginning</span> of each half year. Normally retrieved</span>
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<pre style="margin: 0">+<span id="LC129" class="line"> near the <span class="idiff left right">end</span> of each half year. Normally retrieved</span>
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<pre style="margin: 0"> <span id="LC130" class="line"> by a cron(1) job, but some varieties of <<refclock>> (notably</span>
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<pre style="margin: 0"> <span id="LC131" class="line"> GPSes) update the same information during normal operation.</span>
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<pre style="margin: 0"> <span id="LC132" class="line"></span>
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<td class="line_content match " style="background: #fafafa; color: rgba(0,0,0,0.3); padding-left: 0.5em; padding-right: 0.5em" bgcolor="#fafafa">@@ -145,13 +150,13 @@</td>
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<pre style="margin: 0"> <span id="LC150" class="line"> http://www.nist.gov/[National Institute of Standards and</span>
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146
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151
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<pre style="margin: 0"> <span id="LC151" class="line"> Technology]. The civilian national time authority of the USA;</span>
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152
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<pre style="margin: 0"> <span id="LC152" class="line"> runs <<WWVB>>. Responsible for keeping U.S. civil time</span>
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148
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<pre style="margin: 0">-<span id="LC148" class="line"> coordinated with <span class="idiff left right">international UTC time. NIST time tracks</span> <<USNO>></span>
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149
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<pre style="margin: 0">-<span id="LC149" class="line"> time <span class="idiff left right">to within a few</span> nanoseconds.</span>
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153
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<pre style="margin: 0">+<span id="LC153" class="line"> coordinated with <span class="idiff left right">UTC. Civil <<NIST>> and military</span> <<USNO>></span>
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154
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<pre style="margin: 0">+<span id="LC154" class="line"> time <span class="idiff left right">agree to within</span> nanoseconds.</span>
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150
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155
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<pre style="margin: 0"> <span id="LC155" class="line"></span>
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151
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156
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<pre style="margin: 0"> <span id="LC156" class="line">[[NTP-classic]] NTP Classic::</span>
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152
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<pre style="margin: 0"> <span id="LC157" class="line"> The original reference implementation of NTP by Dave Mills, later</span>
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153
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<pre style="margin: 0">-<span id="LC153" class="line"> maintained by the Network Time Foundation. <span class="idiff left right">NTPsec forked from i</span>t</span>
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154
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<pre style="margin: 0">-<span id="LC154" class="line"> on June 6th, 2015.</span>
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158
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<pre style="margin: 0">+<span id="LC158" class="line"> maintained by the Network Time Foundation. <span class="idiff left right">It is available a</span>t</span>
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<td class="diff-line-num new new_line" data-linenumber="159" style="background: #ddfbe6; border-right-color: #c7f0d2; border-right-style: solid; border-right-width: 1px; color: rgba(0,0,0,0.3); padding: 0 5px; text-align: right; width: 35px" align="right" bgcolor="#ddfbe6">
159
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<pre style="margin: 0">+<span id="LC159" class="line"> <span class="idiff left right">http://www.ntp.org/ . NTPsec forked from it </span>on June 6th, 2015.</span>
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155
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160
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<pre style="margin: 0"> <span id="LC160" class="line"></span>
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156
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161
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<pre style="margin: 0"> <span id="LC161" class="line">[[nonce]] nonce::</span>
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157
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162
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<pre style="margin: 0"> <span id="LC162" class="line"> An arbitrary number that may only be used once. a random or</span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="195" style="background: #fafafa; border-right-color: #f0f0f0; border-right-style: solid; border-right-width: 1px; color: rgba(0,0,0,0.3); padding: 0 5px; text-align: right; width: 35px" align="right" bgcolor="#fafafa">...</td>
<td class="diff-line-num unfold js-unfold new_line" data-linenumber="200" style="background: #fafafa; border-right-color: #f0f0f0; border-right-style: solid; border-right-width: 1px; color: rgba(0,0,0,0.3); padding: 0 5px; text-align: right; width: 35px" align="right" bgcolor="#fafafa">...</td>
<td class="line_content match " style="background: #fafafa; color: rgba(0,0,0,0.3); padding-left: 0.5em; padding-right: 0.5em" bgcolor="#fafafa">@@ -195,16 +200,19 @@</td>
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195
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200
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<pre style="margin: 0"> <span id="LC200" class="line"> In an NTP context, "the pool" is usually the</span>
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<td class="diff-line-num old_line" data-linenumber="196" style="background: #fafafa; border-right-color: #f0f0f0; border-right-style: solid; border-right-width: 1px; color: rgba(0,0,0,0.3); padding: 0 5px; text-align: right; width: 35px" align="right" bgcolor="#fafafa">
196
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201
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<pre style="margin: 0"> <span id="LC201" class="line"> http://www.pool.ntp.org/en/[NTP Pool Project], a collection of</span>
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<pre style="margin: 0"> <span id="LC202" class="line"> thousands of NTP servers accessible through DNS servers that hand</span>
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<pre style="margin: 0">-<span id="LC198" class="line"> out service addresses at random from the pool.</span>
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<pre style="margin: 0">+<span id="LC203" class="line"> out "nearby" server addresses from the pool. These servers are</span>
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204
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<pre style="margin: 0">+<span id="LC204" class="line"> usually run by volunteers, and available via well-known DNS names.</span>
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205
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<pre style="margin: 0"> <span id="LC205" class="line"></span>
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<pre style="margin: 0">-<span id="LC200" class="line">[[proventic]] proventic:: <<Mills-speak>> for "the transitive completion of the</span>
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<pre style="margin: 0">-<span id="LC201" class="line"> authentication relationship", defined in RFC 5906. Time is proventic</span>
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<pre style="margin: 0">-<span id="LC202" class="line"> if it is provided by a chain of time servers between which packets</span>
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<pre style="margin: 0">-<span id="LC203" class="line"> are authenticated and the chain reaches back to Stratum 1.</span>
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206
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<pre style="margin: 0">+<span id="LC206" class="line">[[proventic]] proventic:: <<Mills-speak>> for "the transitive</span>
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207
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<pre style="margin: 0">+<span id="LC207" class="line"> completion of the authentication relationship", defined in RFC 5906.</span>
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208
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<pre style="margin: 0">+<span id="LC208" class="line"> Time is proventic if it is provided by a chain of time servers</span>
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209
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<pre style="margin: 0">+<span id="LC209" class="line"> between which packets are authenticated and the chain reaches</span>
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210
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<pre style="margin: 0">+<span id="LC210" class="line"> back to Stratum 1.</span>
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204
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211
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<pre style="margin: 0"> <span id="LC211" class="line"></span>
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205
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<pre style="margin: 0"> <span id="LC212" class="line">[[refclock]] refclock::</span>
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206
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<pre style="margin: 0"> <span id="LC213" class="line"> Shorthand for a "reference clock", a primary time source. A computer</span>
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207
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<pre style="margin: 0">-<span id="LC207" class="line"> with a refclock is implicitly Stratum 1.</span>
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214
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<pre style="margin: 0">+<span id="LC214" class="line"> with a refclock is implicitly Stratum 1. Examples include <<GPS>></span>
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215
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<pre style="margin: 0">+<span id="LC215" class="line"> or <<time radio>> receivers, or even a master cesium clock.</span>
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208
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<pre style="margin: 0"> <span id="LC216" class="line"></span>
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<pre style="margin: 0"> <span id="LC217" class="line">[[stratum]] stratum::</span>
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210
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<pre style="margin: 0"> <span id="LC218" class="line"> A "stratum" is a layer in the hierarchy of time servers. a</span>
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<td class="line_content match " style="background: #fafafa; color: rgba(0,0,0,0.3); padding-left: 0.5em; padding-right: 0.5em" bgcolor="#fafafa">@@ -212,8 +220,10 @@</td>
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<pre style="margin: 0"> <span id="LC220" class="line"> 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="LC221" class="line"> stratum N+1. Often capitalized, especially when referring to all</span>
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<pre style="margin: 0"> <span id="LC222" class="line"> members of a stratum. While strata up to 15 are defined, it is</span>
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<pre style="margin: 0">-<span id="LC215" class="line"> unusual to see a public timeserver with stratum > 3, and thus</span>
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<pre style="margin: 0">-<span id="LC216" class="line"> almost all NTP clients are at Stratum 4 or lower.</span>
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<pre style="margin: 0">+<span id="LC223" class="line"> unusual to see a public timeserver with stratum greater than 3,</span>
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<pre style="margin: 0">+<span id="LC224" class="line"> and thus almost all NTP clients are at Stratum 4 or lower.</span>
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<pre style="margin: 0">+<span id="LC225" class="line"> Notice that a 'lower' stratum is closer to the reference clock than</span>
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<pre style="margin: 0">+<span id="LC226" class="line"> a 'higher'.</span>
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<pre style="margin: 0"> <span id="LC227" class="line"></span>
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<pre style="margin: 0"> <span id="LC228" class="line">[[time-radio]] time radio::</span>
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<pre style="margin: 0"> <span id="LC229" class="line"> A radio receiver specialized for picking up accurate time reference</span>
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<pre style="margin: 0"> <span id="LC240" class="line">[[truechimer]] truechimer::</span>
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<pre style="margin: 0"> <span id="LC241" class="line"> <<Mills-speak>> for a timeserver that provides time believed good,</span>
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<pre style="margin: 0"> <span id="LC242" class="line"> that is with low jitter with respect to UTC. As with a</span>
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<pre style="margin: 0">-<span id="LC233" class="line"> <span class="idiff left right">link#falseticker[falseticker]</span>, this is usually less a property of</span>
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<pre style="margin: 0">+<span id="LC243" class="line"> <span class="idiff left right"><<falseticker>></span>, this is usually less a property of</span>
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<pre style="margin: 0"> <span id="LC244" class="line"> the server itself than it is of favorable network topology.</span>
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<pre style="margin: 0"> <span id="LC245" class="line"></span>
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<pre style="margin: 0"> <span id="LC246" class="line">[[USNO]] USNO::</span>
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<pre style="margin: 0"> <span id="LC247" class="line"> http://www.usno.navy.mil/USNO[The United States Naval Observatory],</span>
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<pre style="margin: 0"> <span id="LC248" class="line"> 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="LC249" class="line"> U.S. military time reference, now delivered primarily by GPS</span>
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<pre style="margin: 0">-<span id="LC240" class="line"> signals. U.S. civil and military time agree to within nanoseconds.</span>
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<pre style="margin: 0">+<span id="LC250" class="line"> signals. U.S. civil <<NIST>> and military <<USNO>> time agree to </span>
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<pre style="margin: 0">+<span id="LC251" class="line"> within nanoseconds.</span>
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<pre style="margin: 0"> <span id="LC252" class="line"></span>
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<pre style="margin: 0"> <span id="LC253" class="line">[[WWVB]] WWVB::</span>
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<pre style="margin: 0"> <span id="LC254" class="line"> https://www.nist.gov/time-and-frequency-services/nist-radio-stations/wwvb[The</span>
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<a href="https://gitlab.com/NTPsec/ntpsec/compare/8c0b96f059686805b57e8fdb13ccf90e5b8090d3...d98cd88896e9e7a00456594df459f6c93ce13042#00399611f870fb51a3606980ffc24682ecbb9633"><strong>docs/tf582_4.txt</strong></a>
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<pre style="margin: 0"> <span id="LC1" class="line">= European Automated Computer Time Services =</span>
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<pre style="margin: 0"> <span id="LC2" class="line"></span>
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<pre style="margin: 0">-<span id="LC3" class="line">Several European countries use the following message data format:</span>
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<pre style="margin: 0">-<span id="LC4" class="line"></span>
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<pre style="margin: 0">-<span id="LC5" class="line"></span>
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<pre style="margin: 0">-<span id="LC6" class="line">0000000000111111111122222222223333333333444444444455555555556666666666777777777</span>
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<pre style="margin: 0">+<span id="LC3" class="line">The National Laboratories of many European countries provide</span>
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<pre style="margin: 0">+<span id="LC4" class="line">time information in a standardised format, an ITU-R </span>
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<pre style="margin: 0">+<span id="LC5" class="line">Recommendation (ITU-R TF583.4). Information is provided</span>
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<pre style="margin: 0">+<span id="LC6" class="line">over a dial-up modem, with one 78-char segment every second.</span>
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<pre style="margin: 0">+<span id="LC7" class="line">A description of the time code is available at</span>
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<pre style="margin: 0">+<span id="LC8" class="line">https://www.ptb.de/cms/en/ptb/fachabteilungen/abt4/fb-44/ag-442/dissemination-of-legal-time/dissemination-of-time-via-the-public-telephone-network/the-european-telephone-time-code.html</span>
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<pre style="margin: 0">+<span id="LC9" class="line"></span>
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<pre style="margin: 0">+<span id="LC10" class="line">The following countries have traditionally provided this service: </span>
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<pre style="margin: 0">+<span id="LC11" class="line">Austria, Belgium, Germany, Italy, The Netherlands, Poland, Portugal,</span>
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<pre style="margin: 0">+<span id="LC12" class="line">Romania, Spain, Sweden, Switzerland, Turkey and United Kingdom.</span>
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<pre style="margin: 0"> <span id="LC13" class="line"></span>
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<pre style="margin: 0">-<span id="LC8" class="line">0123456789012345678901234567890123456789012345678901234567890123456789012345678</span>
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<pre style="margin: 0">+<span id="LC14" class="line">Note that the service is usually available from outside the country</span>
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<pre style="margin: 0">+<span id="LC15" class="line">as well, as long as you are willing to make a long-distance phone</span>
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<pre style="margin: 0">+<span id="LC16" class="line">call.</span>
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17
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<pre style="margin: 0"> <span id="LC17" class="line"></span>
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<pre style="margin: 0">-<span id="LC10" class="line">This format is an ITU-R Recommendation (ITU-R TF583.4) and is now</span>
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11
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<pre style="margin: 0">-<span id="LC11" class="line">available from the primary timing centres of the following countries:</span>
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12
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<pre style="margin: 0">-<span id="LC12" class="line">Austria, Belgium, Germany, Italy, The Netherlands, Poland, Portugal,</span>
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13
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<pre style="margin: 0">-<span id="LC13" class="line">Romania, Spain, Sweden, Switzerland, Turkey and United Kingdom. Some</span>
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14
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<pre style="margin: 0">-<span id="LC14" class="line">examples are:</span>
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18
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<pre style="margin: 0">+<span id="LC18" class="line">Some examples are:</span>
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15
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19
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<pre style="margin: 0"> <span id="LC19" class="line"></span>
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16
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<pre style="margin: 0">-<span id="LC16" class="line">* In Germany<span class="idiff left right"> by</span> Physikalisch-Technische Bundesanstalt (PTB)'s timecode</span>
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20
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<pre style="margin: 0">+<span id="LC20" class="line">* In Germany<span class="idiff left right">,</span> Physikalisch-Technische Bundesanstalt (PTB)'s timecode</span>
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17
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21
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<pre style="margin: 0"> <span id="LC21" class="line">service. Phone number: +49 5 31 51 20 38.</span>
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18
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22
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<pre style="margin: 0"> <span id="LC22" class="line">+</span>
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19
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23
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<pre style="margin: 0"> <span id="LC23" class="line">For more detail, see</span>
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20
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<pre style="margin: 0">-<span id="LC20" class="line">http://www.ptb.de/cms/index.php?id=1786&L=1</span>
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24
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<pre style="margin: 0">+<span id="LC24" class="line">http<span class="idiff left right">s</span>://www.ptb.de/cms/index.php?id=1786&L=1</span>
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21
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25
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<pre style="margin: 0"> <span id="LC25" class="line"></span>
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22
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<pre style="margin: 0">-<span id="LC22" class="line">* In the UK<span class="idiff left right"> by</span> National Physical Laboratory (NPL)'s Telephone Time Service.</span>
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26
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<pre style="margin: 0">+<span id="LC26" class="line">* In the UK<span class="idiff left right">,</span> National Physical Laboratory (NPL)'s Telephone Time Service.</span>
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23
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27
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<pre style="margin: 0"> <span id="LC27" class="line">Phone number: 020 8943 6333</span>
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24
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28
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<pre style="margin: 0"> <span id="LC28" class="line">+</span>
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<pre style="margin: 0">-<span id="LC25" class="line">For more detail, see http<span class="idiff left right">://www.npl.co.uk/science-technology/time-frequency/products-and-services/time/time-synchronisation-of-computers-to-utc(npl)</span></span>
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<pre style="margin: 0">+<span id="LC29" class="line">For more detail, see http<span class="idiff left right">s://www.npl.co.uk/science-technology/time-frequency/products-and-services/time/time-synchronisation-of-computers-to-utc(npl)</span></span>
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30
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<pre style="margin: 0"> <span id="LC30" class="line"></span>
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<pre style="margin: 0">-<span id="LC27" class="line">* In Italy<span class="idiff left right"> by</span> L'Istituto Nazionale di Ricerca Metrologica</span>
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31
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<pre style="margin: 0">+<span id="LC31" class="line">* In Italy<span class="idiff left right">,</span> L'Istituto Nazionale di Ricerca Metrologica</span>
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28
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32
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<pre style="margin: 0"> <span id="LC32" class="line">(INRIM)'s CTD service. Phone numbers: 011 39 19 263 and 011 39 19 264</span>
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<td class="diff-line-num old_line" data-linenumber="29" style="background: #fafafa; border-right-color: #f0f0f0; border-right-style: solid; border-right-width: 1px; color: rgba(0,0,0,0.3); padding: 0 5px; text-align: right; width: 35px" align="right" bgcolor="#fafafa">
29
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33
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<pre style="margin: 0"> <span id="LC33" class="line">+</span>
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30
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<pre style="margin: 0">-<span id="LC30" class="line">For more detail, see http://www.inrim.it/res/tf/ctd_i.shtml</span>
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34
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<pre style="margin: 0">+<span id="LC34" class="line">For more detail, see http<span class="idiff left right">s</span>://www.inrim.it/res/tf/ctd_i.shtml</span>
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31
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35
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<pre style="margin: 0"> <span id="LC35" class="line"></span>
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<pre style="margin: 0">-<span id="LC32" class="line">* In Sweden<span class="idiff left right"> by SP Swedish National Testing and Research Institute </span>'s</span>
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<pre style="margin: 0">+<span id="LC36" class="line">* In Sweden<span class="idiff left right">, SP Swedish National Testing and Research Institute</span>'s</span>
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37
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<pre style="margin: 0"> <span id="LC37" class="line">timecode service. Phone number: +46 33 415783.</span>
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38
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<pre style="margin: 0"> <span id="LC38" class="line">+</span>
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<pre style="margin: 0">-<span id="LC35" class="line">For more detail, see http://www.sp.se/en/index/services/time_sync/modem_time/Sidor/default.aspx</span>
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<td class="diff-line-num new new_line" data-linenumber="39" style="background: #ddfbe6; border-right-color: #c7f0d2; border-right-style: solid; border-right-width: 1px; color: rgba(0,0,0,0.3); padding: 0 5px; text-align: right; width: 35px" align="right" bgcolor="#ddfbe6">
39
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<pre style="margin: 0">+<span id="LC39" class="line">For more detail, see http<span class="idiff left right">s</span>://www.sp.se/en/index/services/time_sync/modem_time/Sidor/default.aspx</span>
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36
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40
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<pre style="margin: 0"> <span id="LC40" class="line"></span>
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37
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41
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<pre style="margin: 0"> <span id="LC41" class="line">== Additional Information ==</span>
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<pre style="margin: 0"> <span id="LC42" class="line"></span>
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