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<h3>
Gary E. Miller 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>
<li>
<strong><a href="https://gitlab.com/NTPsec/ntpsec/commit/65dfba7363e932f9014c2f43b7889c50b38645da">65dfba73</a></strong>
<div>
<span>by Paul Theodoropoulos</span>
<i>at 2018-10-16T19:33:01Z</i>
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<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Wording fixes, NIST guideline conformance.
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<h4>1 changed file:</h4>
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<a href="#fcf8dc34e47fb7e5661290a83914bbc18258dc7e">
docs/driver_gpsd.txt
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<h4>Changes:</h4>
<li id="fcf8dc34e47fb7e5661290a83914bbc18258dc7e">
<a href="https://gitlab.com/NTPsec/ntpsec/commit/65dfba7363e932f9014c2f43b7889c50b38645da#fcf8dc34e47fb7e5661290a83914bbc18258dc7e"><strong>docs/driver_gpsd.txt</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">@@ -30,9 +30,9 @@ clock instance.)</td>
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<pre style="margin: 0;"> <span id="LC31" class="line" lang="plaintext">This driver does not expect _GPSD_ to be running or the clock device to</span>
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<pre style="margin: 0;"> <span id="LC32" class="line" lang="plaintext">be present _a priori_; it will try to re-establish a lost or hitherto</span>
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<pre style="margin: 0;">-<span id="LC33" class="line" lang="plaintext">unsuccessful connection and will wait for device to come up in _GPSD._</span>
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<pre style="margin: 0;">+<span id="LC33" class="line" lang="plaintext">unsuccessful connection and will wait for <span class="idiff left right">the </span>device to come up in _GPSD._</span>
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<pre style="margin: 0;"> <span id="LC34" class="line" lang="plaintext">There is an initial 10 seconds delay between a connection loss or failed</span>
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<pre style="margin: 0;">-<span id="LC35" class="line" lang="plaintext">attempt and the next reconnect attempt; this <span class="idiff left right">makes sure</span> that there is no</span>
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<pre style="margin: 0;">+<span id="LC35" class="line" lang="plaintext">attempt and the next reconnect attempt; this <span class="idiff left right">ensures</span> that there is no</span>
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<pre style="margin: 0;"> <span id="LC36" class="line" lang="plaintext">thrashing on the network layer. If the connection fails again, an</span>
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<pre style="margin: 0;"> <span id="LC37" class="line" lang="plaintext">exponential back off is used with an upper limit of approximately 10</span>
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<pre style="margin: 0;"> <span id="LC38" class="line" lang="plaintext">minutes.</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">@@ -58,9 +58,9 @@ were used to obtain it.</td>
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<pre style="margin: 0;"> <span id="LC58" class="line" lang="plaintext">The _GPSD_ driver uses the same device name as the NMEA driver, namely</span>
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<pre style="margin: 0;"> <span id="LC59" class="line" lang="plaintext">+/dev/gpsu+. There is a simple reason for that: While the NMEA driver</span>
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<pre style="margin: 0;"> <span id="LC60" class="line" lang="plaintext">and the _GPSD_ driver can be active at the same time *for different</span>
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<pre style="margin: 0;">-<span id="LC61" class="line" lang="plaintext">devices*, they cannot access the same device at <span class="idiff left right">a</span> time. Having the same</span>
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<pre style="margin: 0;">-<span id="LC62" class="line" lang="plaintext">name helps <span class="idiff left right">on that. It also eases migration from using NMEA directly to</span></span>
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<pre style="margin: 0;">-<span id="LC63" class="line" lang="plaintext"><span class="idiff left right">using _GPSD_, as no new links etc</span> need to be created.</span>
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<pre style="margin: 0;">+<span id="LC61" class="line" lang="plaintext">devices*, they cannot access the same device at <span class="idiff left right">the same</span> time. Having the same</span>
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<pre style="margin: 0;">+<span id="LC62" class="line" lang="plaintext">name helps <span class="idiff left right">prevent that collision. It also eases migration from using NMEA</span></span>
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<pre style="margin: 0;">+<span id="LC63" class="line" lang="plaintext"><span class="idiff left right">directly to using _GPSD_, as no new links etc.</span> need to be created.</span>
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<pre style="margin: 0;"> <span id="LC64" class="line" lang="plaintext"></span>
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<pre style="margin: 0;"> <span id="LC65" class="line" lang="plaintext">_GPSD_ is normally started with the device name to access; it can also</span>
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<pre style="margin: 0;"> <span id="LC66" class="line" lang="plaintext">be instructed by hot-plug scripts to add or remove devices from its</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">@@ -77,7 +77,7 @@ change in the future.</td>
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<pre style="margin: 0;"> <span id="LC77" class="line" lang="plaintext"></span>
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<pre style="margin: 0;"> <span id="LC78" class="line" lang="plaintext">== The \'mode' word ==</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">A few operation modes can be selected with the mode word.</span>
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<pre style="margin: 0;">+<span id="LC80" class="line" lang="plaintext">A few operation<span class="idiff left right">al</span> modes can be selected with the mode word.</span>
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<pre style="margin: 0;"> <span id="LC81" class="line" lang="plaintext"></span>
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<pre style="margin: 0;"> <span id="LC82" class="line" lang="plaintext">[cols="10%d,10%,80%a",options="header"]</span>
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<pre style="margin: 0;"> <span id="LC83" 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">@@ -103,9 +103,9 @@ PPS drops out. This mode is a possible choice for receivers that provide</td>
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<pre style="margin: 0;"> <span id="LC103" class="line" lang="plaintext">a PPS signal most of the time but have an unstable serial timing that</span>
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<pre style="margin: 0;"> <span id="LC104" class="line" lang="plaintext">cannot be fudge-compensated.</span>
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<pre style="margin: 0;"> <span id="LC105" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">-<span id="LC106" class="line" lang="plaintext">        | 2       |Automatic mode. Tries to operate in strict mode unless it fails to process valid samples for some time, currently 120s. Then</span>
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<pre style="margin: 0;">+<span id="LC106" class="line" lang="plaintext">        | 2       |Automatic mode. Tries to operate in strict mode unless it fails to process valid samples for some time, currently 120<span class="idiff left right"> </span>s. Then</span>
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<pre style="margin: 0;"> <span id="LC107" class="line" lang="plaintext">it reverts to IBT-only operation until the PPS is stable again for</span>
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<pre style="margin: 0;">-<span id="LC108" class="line" lang="plaintext">40s, when strict mode is engaged again.</span>
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<pre style="margin: 0;">+<span id="LC108" class="line" lang="plaintext">40<span class="idiff left right"> </span>s, when strict mode is engaged again.</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">*Important Notice: This is an experimental feature!*</span>
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<pre style="margin: 0;"> <span id="LC111" 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">@@ -145,8 +145,8 @@ The secondary unit employs the usual precautions before feeding clock</td>
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<pre style="margin: 0;"> <span id="LC145" class="line" lang="plaintext">samples:</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="LC147" class="line" lang="plaintext">* The system must be already in a synchronised state.</span>
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<pre style="margin: 0;">-<span id="LC148" class="line" lang="plaintext">* The system offset must be less than 400ms absolute.</span>
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<pre style="margin: 0;">-<span id="LC149" class="line" lang="plaintext">* The phase adjustment from the PPS signal must also be less than 400ms</span>
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<pre style="margin: 0;">+<span id="LC148" class="line" lang="plaintext">* The system offset must be less than 400<span class="idiff left right"> </span>ms absolute.</span>
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<pre style="margin: 0;">+<span id="LC149" class="line" lang="plaintext">* The phase adjustment from the PPS signal must also be less than 400<span class="idiff left right"> </span>ms</span>
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<pre style="margin: 0;"> <span id="LC150" class="line" lang="plaintext">absolute.</span>
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<pre style="margin: 0;"> <span id="LC151" class="line" lang="plaintext"></span>
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<pre style="margin: 0;"> <span id="LC152" class="line" lang="plaintext">If option +flag1+ is set for the secondary unit, the unit asserts</span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="239" 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="239" 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">@@ -239,8 +239,8 @@ clock units. This avoids double transmission over two sockets and</td>
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<pre style="margin: 0;"> <span id="LC239" class="line" lang="plaintext">decoding the same data twice, but the primary unit is always needed as a</span>
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<pre style="margin: 0;"> <span id="LC240" class="line" lang="plaintext">downside of this approach.</span>
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<pre style="margin: 0;"> <span id="LC241" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">-<span id="LC242" class="line" lang="plaintext">[[fn2]]link:#fn2bl[^2^)]The clock driver suppresses the processing <span class="idiff left right">PPS records</span></span>
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<pre style="margin: 0;">-<span id="LC243" class="line" lang="plaintext">when the TPV/TIME data indicates the receiver has no fix. It can also</span>
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<pre style="margin: 0;">+<span id="LC242" class="line" lang="plaintext">[[fn2]]link:#fn2bl[^2^)]The clock driver suppresses the processing <span class="idiff left right">of PPS</span></span>
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<pre style="margin: 0;">+<span id="LC243" class="line" lang="plaintext"><span class="idiff left right">records </span>when the TPV/TIME data indicates the receiver has no fix. It can also</span>
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<pre style="margin: 0;"> <span id="LC244" class="line" lang="plaintext">deal with situations where the PPS signal is not delivered to _GPSD_.</span>
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<pre style="margin: 0;"> <span id="LC245" class="line" lang="plaintext">But once it is available, it is also processed and used to create</span>
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<pre style="margin: 0;"> <span id="LC246" class="line" lang="plaintext">samples. If a receiver cannot be trusted for the precision of its PPS</span>
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