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GitLab

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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/c15147e9eea348f754409a02779c32974ab569c0">c15147e9</a></strong>

<div>

<span>by Richard Laager</span>

<i>at 2019-01-21T11:07:32Z</i>

</div>

<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Fix PPS documentation

The PPS documentation did not match the code.

The code is:

  if (typepps != NULL && fabs(sys_offset) < 0.4 &&

      (!typepps->is_pps_driver ||

      sys_prefer != NULL ||

      (typesystem == NULL && sys_minsane == 0))) {

Note that the sys_prefer and sys_minsane rules only apply to the driver

named pps, not to drivers with integrated PPS support.  PPS always needs

another source, but for integrated drivers, that source is the same

driver.

The documentation also said the PPS driver will be selected "if the PPS peer

is designated as a prefer peer", but that is not true; no such code exists.

</pre>

</li>

<li>

<strong><a href="https://gitlab.com/NTPsec/ntpsec/commit/9118e58e6061c40ff79fc0cc660b0d040784d066">9118e58e</a></strong>

<div>

<span>by Richard Laager</span>

<i>at 2019-01-21T11:07:32Z</i>

</div>

<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Fix the PPS threshold in the PPS docs

The threshold is 0.4 s, not 0.5 s.  The code and the other mentions of

this threshold are consistent.  This brings the one outlier in line.

</pre>

</li>

<li>

<strong><a href="https://gitlab.com/NTPsec/ntpsec/commit/f9f7af96de0cc4c2a87a45d53b02868cbf3d3074">f9f7af96</a></strong>

<div>

<span>by Richard Laager</span>

<i>at 2019-01-21T11:07:32Z</i>

</div>

<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Cleanup the PPS driver docs

- Link to the PPSAPI docs

- RFC 2783 is NOT an IETF Proposed Standard.  That phrase has a

  specific meaning in the IETF process.  RFC 2783 remains an

  Informational RFC.

- Change the RFC 2783 citation style to match the style from

  includes/ntpd-body.adoc.

- Fix the pps.html link title to match exactly that of the target

- Drop mentions of Tru64 (Alpha) and SunOS.  These are ancient.

</pre>

</li>

</ul>

<h4>3 changed files:</h4>

<ul>

<li class="file-stats">

<a href="#871bd7bc59917717c7a098d9ed7130fe99b30d65">

docs/driver_pps.adoc

</a>

</li>

<li class="file-stats">

<a href="#a8b6318536663803ef3ddb5e791597e8bb6df0b1">

docs/pps.adoc

</a>

</li>

<li class="file-stats">

<a href="#be0ecfbd2c406526cbefa8e883c4dd09e96154aa">

docs/prefer.adoc

</a>

</li>

</ul>

<h4>Changes:</h4>

<li id="871bd7bc59917717c7a098d9ed7130fe99b30d65">

<a href="https://gitlab.com/NTPsec/ntpsec/compare/ee8ff57b0467d4740ef3e24ba11b1cc9002cf76b...f9f7af96de0cc4c2a87a45d53b02868cbf3d3074#871bd7bc59917717c7a098d9ed7130fe99b30d65"><strong>docs/driver_pps.adoc</strong></a>

<hr>

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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="8" 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="8" 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">@@ -8,7 +8,7 @@ Name: pps</td>

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<td class="diff-line-num old_line" data-linenumber="8" 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="LC8" class="line" lang="plaintext">Reference ID: PPS</span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="9" 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="9" 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="LC9" class="line" lang="plaintext">Driver ID: PPS</span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="10" 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="10" 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="LC10" class="line" lang="plaintext">Serial or Parallel Port: /dev/pps__u__</span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="11" 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="11" 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="LC11" class="line" lang="plaintext">Requires: <span class="idiff left right">PPSAPI signal interface for PPS signal processing.</span></span>

</pre>

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<td class="diff-line-num new old_line" data-linenumber="12" 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="11" 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="LC11" class="line" lang="plaintext">Requires: <span class="idiff left right">link:kernpps.html[PPSAPI Interface for Precision Time Signals]</span></span>

</pre>

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<pre style="margin: 0;"> <span id="LC12" class="line" lang="plaintext"></span>

</pre>

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<pre style="margin: 0;"> <span id="LC13" class="line" lang="plaintext">== Description ==</span>

</pre>

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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="LC14" class="line" lang="plaintext"></span>

</pre>

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<td class="diff-line-num unfold js-unfold new_line" data-linenumber="30" 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">@@ -30,16 +30,16 @@ While this driver can discipline the time and frequency relative to the</td>

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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">PPS source, it cannot number the seconds. For this purpose an auxiliary</span>

</pre>

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<pre style="margin: 0;"> <span id="LC31" class="line" lang="plaintext">source is required; ordinarily a radio clock operated as a primary</span>

</pre>

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<pre style="margin: 0;"> <span id="LC32" class="line" lang="plaintext">reference (stratum 1) source; however, another NTP time server can be</span>

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<td class="diff-line-num old old_line" data-linenumber="33" 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="33" 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="LC33" class="line" lang="plaintext">used as well. For this purpose, the auxiliary source <span class="idiff left right">should</span> be specified</span>

</pre>

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<td class="diff-line-num new old_line" data-linenumber="34" 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="LC33" class="line" lang="plaintext">used as well. For this purpose, the auxiliary source <span class="idiff left right">must</span> be specified</span>

</pre>

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<pre style="margin: 0;"> <span id="LC34" class="line" lang="plaintext">as the prefer peer, as described in the link:prefer.html[Mitigation</span>

</pre>

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<pre style="margin: 0;"> <span id="LC35" class="line" lang="plaintext">Rules and the +prefer+ Keyword] page.</span>

</pre>

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

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<pre style="margin: 0;">-<span id="LC37" class="line" lang="plaintext">The driver requires the <span class="idiff left right">PPSAPI interface^1^, which is a proposed IETF</span></span>

</pre>

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<pre style="margin: 0;">-<span id="LC38" class="line" lang="plaintext"><span class="idiff left right">standard. The interface consists of the +timepps.h+ header file and</span></span>

</pre>

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<pre style="margin: 0;">-<span id="LC39" class="line" lang="plaintext"><span class="idiff left right">associated kernel support. Support for this interface is included in</span></span>

</pre>

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<td class="diff-line-num new_line old" data-linenumber="37" 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="LC40" class="line" lang="plaintext"><span class="idiff left right">current versions of Solaris, FreeBSD and Linux and proprietary versions</span></span>

</pre>

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<pre style="margin: 0;">-<span id="LC41" class="line" lang="plaintext"><span class="idiff left right">of Tru64 (Alpha) and SunOS. See the link:pps.html[Pulse-per-second</span></span>

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<pre style="margin: 0;">-<span id="LC42" class="line" lang="plaintext"><span class="idiff left right">(PPS) Signal Interfacing] page for </span>further information.</span>

</pre>

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<pre style="margin: 0;">+<span id="LC37" class="line" lang="plaintext">The driver requires the <span class="idiff left right">link:kernpps.html[PPSAPI interface], which is</span></span>

</pre>

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<pre style="margin: 0;">+<span id="LC38" class="line" lang="plaintext"><span class="idiff left right">documented in RFC 2783.  The interface consists of the +timepps.h+</span></span>

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<pre style="margin: 0;">+<span id="LC39" class="line" lang="plaintext"><span class="idiff left right">header file and associated kernel support. Support for this interface is</span></span>

</pre>

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<pre style="margin: 0;">+<span id="LC40" class="line" lang="plaintext"><span class="idiff left right">included in current versions of Solaris, FreeBSD, and Linux. See the</span></span>

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<pre style="margin: 0;">+<span id="LC41" class="line" lang="plaintext"><span class="idiff left right">link:pps.html[Pulse-Per-second (PPS) Signal Interfacing] page for</span></span>

</pre>

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

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

</pre>

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<td class="diff-line-num new_line" data-linenumber="44" 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="LC44" class="line" lang="plaintext">The PPS source can be connected via a serial or parallel port, depending</span>

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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">

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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">

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<pre style="margin: 0;"> <span id="LC45" class="line" lang="plaintext">on the hardware and operating system. A serial port can be dedicated to</span>

</pre>

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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="71" 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="71" 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">@@ -71,10 +71,8 @@ enable the kernel PPS discipline if necessary.</td>

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<pre style="margin: 0;"> <span id="LC71" class="line" lang="plaintext">This driver is enabled only under one of two conditions (a) a prefer</span>

</pre>

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<pre style="margin: 0;"> <span id="LC72" class="line" lang="plaintext">peer other than this driver is among the survivors of the mitigation</span>

</pre>

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<pre style="margin: 0;"> <span id="LC73" class="line" lang="plaintext">algorithms or (b) there are no survivors and the +minsane+ option of the</span>

</pre>

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<pre style="margin: 0;">-<span id="LC74" class="line" lang="plaintext">+tos+ command is 0. The prefer peer designates another source that can</span>

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<pre style="margin: 0;">-<span id="LC75" class="line" lang="plaintext">reliably number the seconds when available. However, if no sources are</span>

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<pre style="margin: 0;">-<span id="LC76" class="line" lang="plaintext">available, the system clock continues to be disciplined by the PPS</span>

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<pre style="margin: 0;">-<span id="LC77" class="line" lang="plaintext">driver on an indefinite basis.</span>

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<pre style="margin: 0;">+<span id="LC74" class="line" lang="plaintext">+tos+ command is 0. In typical usage, the prefer peer designates another</span>

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<pre style="margin: 0;">+<span id="LC75" class="line" lang="plaintext">source that can reliably number the seconds when available.</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">A scenario where the latter behavior can be most useful is a planetary</span>

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<pre style="margin: 0;"> <span id="LC78" class="line" lang="plaintext">orbiter fleet, for instance in the vicinity of Mars, where contact</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">@@ -175,10 +173,9 @@ link:refclock.html[Reference Clock Drivers]</td>

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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">== Reference ==</span>

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<pre style="margin: 0;"> <span id="LC175" class="line" lang="plaintext"></span>

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<pre style="margin: 0;">-<span id="LC178" class="line" lang="plaintext">1.  Mogul, J., D. Mills, J. Brittenson, J. Stone and U. Windl.</span>

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<pre style="margin: 0;">-<span id="LC179" class="line" lang="plaintext">Pulse-per-second API for Unix-like operating systems, version 1. Request</span>

</pre>

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<pre style="margin: 0;">-<span id="LC180" class="line" lang="plaintext">for Comments RFC 2783, Internet Engineering Task Force, March 2000, 31</span>

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<pre style="margin: 0;">-<span id="LC181" class="line" lang="plaintext">pp.</span>

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<pre style="margin: 0;">+<span id="LC176" class="line" lang="plaintext">RFC 2783::</span>

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<pre style="margin: 0;">+<span id="LC177" class="line" lang="plaintext">  Mogul, J., D. Mills, J. Brittenson, J. Stone and U. Windl, _Pulse-Per-Second</span>

</pre>

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<pre style="margin: 0;">+<span id="LC178" class="line" lang="plaintext">  API for Unix-like Operating Systems, Version 1.0_, RFC 2783</span>

</pre>

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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">== Author ==</span>

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<pre style="margin: 0;"> <span id="LC181" class="line" lang="plaintext"></span>

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<a href="https://gitlab.com/NTPsec/ntpsec/compare/ee8ff57b0467d4740ef3e24ba11b1cc9002cf76b...f9f7af96de0cc4c2a87a45d53b02868cbf3d3074#a8b6318536663803ef3ddb5e791597e8bb6df0b1"><strong>docs/pps.adoc</strong></a>

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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">@@ -87,7 +87,7 @@ supporting code automatically compiled. Regardles of mechanism, the PPS signal</td>

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<pre style="margin: 0;"> <span id="LC87" class="line" lang="plaintext">must be present and within nominal jitter and wander tolerances. Additionally,</span>

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<pre style="margin: 0;"> <span id="LC88" class="line" lang="plaintext">the prefer peer must be a truechimer; that is, survive the sanity checks and</span>

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<pre style="margin: 0;"> <span id="LC89" 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="LC90" class="line" lang="plaintext">to the prefer peer must be within ±0.<span class="idiff left right">5</span> s. The kernel maintains a</span>

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<pre style="margin: 0;">+<span id="LC90" class="line" lang="plaintext">to the prefer peer must be within ±0.<span class="idiff left right">4</span> s. The kernel maintains a</span>

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<pre style="margin: 0;"> <span id="LC91" class="line" lang="plaintext">watchdog timer for the PPS signal; if the signal has not been heard or</span>

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<pre style="margin: 0;"> <span id="LC92" class="line" lang="plaintext">is out of tolerance for more than some interval, currently two minutes,</span>

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<pre style="margin: 0;"> <span id="LC93" class="line" lang="plaintext">the kernel discipline is disabled and operation continues as if it were</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">@@ -137,12 +137,14 @@ orphan parents as if synchronized to a server at the orphan stratum.</td>

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<pre style="margin: 0;"> <span id="LC137" class="line" lang="plaintext">Note that, as described on the link:orphan.html[Orphan Mode] page, all</span>

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<pre style="margin: 0;"> <span id="LC138" class="line" lang="plaintext">orphan children will select the same orphan parent for synchronization.</span>

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<pre style="margin: 0;"> <span id="LC139" class="line" lang="plaintext">3.  When a device driver has been configured for pulse-per-second (PPS)</span>

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<pre style="margin: 0;">-<span id="LC140" class="line" lang="plaintext">signals and PPS signals are being received, it is designated the _PPS</span>

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<pre style="margin: 0;">-<span id="LC141" class="line" lang="plaintext">driver._ Note that the Pulse-per-Second driver is often used</span>

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<pre style="margin: 0;">-<span id="LC142" class="line" lang="plaintext">as a PPS driver, but any driver can be configure as a PPS driver if the</span>

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<pre style="margin: 0;">-<span id="LC143" class="line" lang="plaintext">hardware facilities are available. The PPS driver provides precision</span>

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<pre style="margin: 0;">-<span id="LC144" class="line" lang="plaintext">clock discipline only within ±0.4 s, so it is always associated with</span>

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<pre style="margin: 0;">-<span id="LC145" class="line" lang="plaintext">another source or sources that provide the seconds numbering function.</span>

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<pre style="margin: 0;">+<span id="LC140" class="line" lang="plaintext">signals and PPS signals are being received, it is designated _a_ PPS</span>

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<pre style="margin: 0;">+<span id="LC141" class="line" lang="plaintext">driver. Note that _the_ link:driver_pps.html[driver named "pps"] is</span>

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<pre style="margin: 0;">+<span id="LC142" class="line" lang="plaintext">often used as a PPS driver, but any driver can be configured as a PPS</span>

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<pre style="margin: 0;">+<span id="LC143" class="line" lang="plaintext">driver if the hardware facilities are available and the driver supports</span>

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<td class="diff-line-num new new_line" data-linenumber="144" 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="LC144" class="line" lang="plaintext">PPS functionality. PPS provides precision clock discipline only within</span>

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<pre style="margin: 0;">+<span id="LC145" class="line" lang="plaintext">±0.4 s, so it is always associated with another source or sources (in</span>

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<pre style="margin: 0;">+<span id="LC146" class="line" lang="plaintext">the same driver or a separate driver) that provide the seconds numbering</span>

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<pre style="margin: 0;">+<span id="LC147" class="line" lang="plaintext">function.</span>

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<pre style="margin: 0;"> <span id="LC148" class="line" lang="plaintext">4.  When the Undisciplined Local Clock driver is configured, it</span>

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<pre style="margin: 0;"> <span id="LC149" class="line" lang="plaintext">is designated the _local driver_. It can be used either as a backup</span>

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<pre style="margin: 0;"> <span id="LC150" class="line" lang="plaintext">source (stratum greater than zero) should all sources fail, or as the</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">@@ -233,12 +235,13 @@ peer and its offset and jitter are inherited by the corresponding system</td>

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<pre style="margin: 0;"> <span id="LC235" class="line" lang="plaintext">variables. Otherwise, the combine algorithm computes these variables</span>

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<pre style="margin: 0;"> <span id="LC236" class="line" lang="plaintext">from the survivor population.</span>

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<pre style="margin: 0;"> <span id="LC237" class="line" lang="plaintext">3.  If there is a PPS driver and the system clock offset at this point</span>

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<pre style="margin: 0;">-<span id="LC236" class="line" lang="plaintext">is less than 0.4 s, and if there is a prefer peer among the survivors or</span>

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<pre style="margin: 0;">-<span id="LC237" class="line" lang="plaintext">if the PPS peer is designated as a prefer peer, the PPS driver becomes</span>

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<pre style="margin: 0;">-<span id="LC238" class="line" lang="plaintext">the system peer and its offset and jitter are inherited by the system</span>

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<pre style="margin: 0;">-<span id="LC239" class="line" lang="plaintext">variables, thus overriding any variables already computed. Note that a</span>

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<pre style="margin: 0;">-<span id="LC240" class="line" lang="plaintext">PPS driver is present only if PPS signals are actually being received</span>

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<pre style="margin: 0;">-<span id="LC241" class="line" lang="plaintext">and enabled by the associated driver.</span>

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<pre style="margin: 0;">+<span id="LC238" class="line" lang="plaintext">is less than 0.4 s, that PPS driver becomes the system peer and its</span>

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<pre style="margin: 0;">+<span id="LC239" class="line" lang="plaintext">offset and jitter are inherited by the system variables, thus overriding</span>

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<pre style="margin: 0;">+<span id="LC240" class="line" lang="plaintext">any values already computed. However, if the PPS driver is specifically</span>

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<pre style="margin: 0;">+<span id="LC241" class="line" lang="plaintext">the link:driver_pps.html[driver named "pps"], which must be used with</span>

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<pre style="margin: 0;">+<span id="LC242" class="line" lang="plaintext">another driver, then there must be a prefer peer among the survivors, as</span>

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<pre style="margin: 0;">+<span id="LC243" class="line" lang="plaintext">the +prefer+ keyword is used to identify the source associated with the</span>

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<pre style="margin: 0;">+<span id="LC244" class="line" lang="plaintext">PPS input. For an exception, see the +minsane+ option below.</span>

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<pre style="margin: 0;"> <span id="LC245" class="line" lang="plaintext"></span>

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<pre style="margin: 0;"> <span id="LC246" class="line" lang="plaintext">If none of the above is the case, the data are disregarded and the</span>

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<pre style="margin: 0;"> <span id="LC247" class="line" lang="plaintext">system variables remain as they are.</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">@@ -268,8 +271,11 @@ Whether or not the GPS driver disables the PPS signal when the timecode</td>

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<pre style="margin: 0;"> <span id="LC271" class="line" lang="plaintext">becomes unreliable is at the discretion of the driver. Ordinarily, the</span>

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<pre style="margin: 0;"> <span id="LC272" class="line" lang="plaintext">PPS signal is disabled in this case; however, when the GPS receiver has</span>

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<pre style="margin: 0;"> <span id="LC273" class="line" lang="plaintext">a precision holdover oscillator, the driver may elect to continue PPS</span>

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<pre style="margin: 0;">-<span id="LC271" class="line" lang="plaintext">discipline. In this case, +minsane+ can be set to zero so the PPS</span>

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<pre style="margin: 0;">-<span id="LC272" class="line" lang="plaintext">signal continues to discipline the system clock.</span>

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<pre style="margin: 0;">+<span id="LC274" class="line" lang="plaintext">discipline.</span>

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<pre style="margin: 0;">+<span id="LC275" class="line" lang="plaintext"></span>

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<pre style="margin: 0;">+<span id="LC276" class="line" lang="plaintext">To achieve the same result when using the link:driver_pps.html[separate</span>

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<pre style="margin: 0;">+<span id="LC277" class="line" lang="plaintext">"pps" driver], +minsane+ can be set to zero so the PPS signal disciplines</span>

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<pre style="margin: 0;">+<span id="LC278" class="line" lang="plaintext">the system clock in the absense of other sources.</span>

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<pre style="margin: 0;"> <span id="LC279" class="line" lang="plaintext"></span>

</pre>

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274

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<pre style="margin: 0;"> <span id="LC280" class="line" lang="plaintext">'''''</span>

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

</pre>

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