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<h3>
Mark Atwood pushed to branch master
at <a href="https://gitlab.com/NTPsec/ntpsec">NTPsec / ntpsec</a>
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<h4>
Commits:
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<ul>
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<strong><a href="https://gitlab.com/NTPsec/ntpsec/commit/69b78669c44d966539d5de3eff850099446bcb62">69b78669</a></strong>
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<span>by Mark Atwood</span>
<i>at 2017-04-25T22:55:14-07:00</i>
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<pre class="commit-message" style="margin: 0; white-space: pre-wrap">add GPS pivot entry to docs/ntpspeak.txt
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<strong><a href="https://gitlab.com/NTPsec/ntpsec/commit/0a98ac3b261d82c1a87b5b94e8f41317c341f19a">0a98ac3b</a></strong>
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<span>by Mark Atwood</span>
<i>at 2017-04-25T22:55:27-07:00</i>
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<pre class="commit-message" style="margin: 0; white-space: pre-wrap">Merge branch 'master' of gitlab.com:NTPsec/ntpsec
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<h4>1 changed file:</h4>
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<a href="#12442c99323575c288c6d8398cecebf864519b20">
docs/ntpspeak.txt
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<h4>Changes:</h4>
<li id="12442c99323575c288c6d8398cecebf864519b20">
<a href="https://gitlab.com/NTPsec/ntpsec/compare/1cc21c31a5d16de1f4f08cf832bfac0fc0c40470...0a98ac3b261d82c1a87b5b94e8f41317c341f19a#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">@@ -113,6 +113,20 @@</td>
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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="LC115" class="line" lang="plaintext"></span>
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<pre style="margin: 0">+<span id="LC116" class="line" lang="plaintext">[[GPS pivot date]] GPS pivot date::</span>
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<pre style="margin: 0">+<span id="LC117" class="line" lang="plaintext"> The GPS pivot date is specific fixed arbitrary time. It is stored in</span>
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<pre style="margin: 0">+<span id="LC118" class="line" lang="plaintext"> the firmware of a GPS receiver, and is probably the date that firmware</span>
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<pre style="margin: 0">+<span id="LC119" class="line" lang="plaintext"> was released. For reasons, a GPS receiver will start reporting</span>
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<pre style="margin: 0">+<span id="LC120" class="line" lang="plaintext"> incorrect time 512 weeks (9.8 years) or 1024 weeks (19.6 years) after</span>
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<pre style="margin: 0">+<span id="LC121" class="line" lang="plaintext"> it's pivot date. There is generally no way to determine what a given</span>
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<pre style="margin: 0">+<span id="LC122" class="line" lang="plaintext"> GPS receiver's pivot date is, or to determine that it has failed in</span>
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<pre style="margin: 0">+<span id="LC123" class="line" lang="plaintext"> this manner.</span>
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<pre style="margin: 0">+<span id="LC124" class="line" lang="plaintext"></span>
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<pre style="margin: 0">+<span id="LC125" class="line" lang="plaintext"> It is recommended that any critical Stratum 1 NTP server that uses</span>
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<pre style="margin: 0">+<span id="LC126" class="line" lang="plaintext"> a GPS receiver as a refclock not use one that is more than 9 years</span>
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<pre style="margin: 0">+<span id="LC127" class="line" lang="plaintext"> old, and to have a peer or nopeer relationship with other NTP</span>
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<pre style="margin: 0">+<span id="LC128" class="line" lang="plaintext"> servers, so as to detect when the GPS time is no longer sane.</span>
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<pre style="margin: 0">+<span id="LC129" class="line" lang="plaintext"></span>
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<pre style="margin: 0"> <span id="LC130" class="line" lang="plaintext">[[holdover]] holdover::</span>
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<pre style="margin: 0"> <span id="LC131" class="line" lang="plaintext"> In connection with a <<GPSDO>> or <<time radio>> that may lose</span>
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<pre style="margin: 0"> <span id="LC132" class="line" lang="plaintext"> signal from its time source, holdover is its ability to continue</span>
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