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<h3>
Matt Selsky 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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<li>
<strong><a href="https://gitlab.com/NTPsec/ntpsec/commit/1d0de03e6d44cbfb52a0cdbd0e62512720cbcccc">1d0de03e</a></strong>
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<span>by Paul Theodoropoulos</span>
<i>at 2018-10-31T06:07:19Z</i>
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<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">NIST unit guideline conformance, minor wordsmithing, emdash for clarity.
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<h4>1 changed file:</h4>
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<a href="#88a0a760d9967db87e47ae6f8c2dfc94416f0b47">
docs/filter.txt
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<h4>Changes:</h4>
<li id="88a0a760d9967db87e47ae6f8c2dfc94416f0b47">
<a href="https://gitlab.com/NTPsec/ntpsec/commit/1d0de03e6d44cbfb52a0cdbd0e62512720cbcccc#88a0a760d9967db87e47ae6f8c2dfc94416f0b47"><strong>docs/filter.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">@@ -12,11 +12,11 @@ image::pic/flt5.gif["Wedge Scattergram",align="center"]</td>
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<pre style="margin: 0;"> <span id="LC12" class="line" lang="plaintext">Figure 1. Wedge Scattergram</span>
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<pre style="margin: 0;"> <span id="LC14" class="line" lang="plaintext">Figure 1 shows a typical _wedge scattergram_ plotting sample points of</span>
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<pre style="margin: 0;">-<span id="LC15" class="line" lang="plaintext">offset versus delay collected over a 24<span class="idiff left right">-hr</span> period. As the delay</span>
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<pre style="margin: 0;">+<span id="LC15" class="line" lang="plaintext">offset versus delay collected over a 24<span class="idiff left right"> h</span> period. As the delay</span>
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<pre style="margin: 0;"> <span id="LC16" class="line" lang="plaintext">increases, the offset variation increases, so the best samples are those</span>
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<pre style="margin: 0;"> <span id="LC17" class="line" lang="plaintext">at the lowest delay. There are two limb lines at slope ±0.5,</span>
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<pre style="margin: 0;"> <span id="LC18" class="line" lang="plaintext">representing the limits of sample variation. However, it is apparent</span>
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<pre style="margin: 0;">-<span id="LC19" class="line" lang="plaintext">that, if a way could be found to <span class="idiff left right">find</span> the sample of lowest delay, it</span>
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<pre style="margin: 0;">+<span id="LC19" class="line" lang="plaintext">that, if a way could be found to <span class="idiff left right">determine</span> the sample of lowest delay, it</span>
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<pre style="margin: 0;"> <span id="LC20" class="line" lang="plaintext">would have the least offset variation and would be the best candidate to</span>
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<pre style="margin: 0;"> <span id="LC21" class="line" lang="plaintext">synchronize the system clock.</span>
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<pre style="margin: 0;"> <span id="LC22" 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">@@ -78,7 +78,7 @@ image:pic/flt1.gif["Raw",align="left"] image:pic/flt2.gif["Filtered",align="righ</td>
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<pre style="margin: 0;"> <span id="LC78" class="line" lang="plaintext">Figure 2. Raw (left) and Filtered (right) Offsets</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">Figure 2 shows the performance of the algorithm for a typical Internet</span>
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<pre style="margin: 0;">-<span id="LC81" class="line" lang="plaintext">path over a 24<span class="idiff left right">-hr</span> period. The graph on the left shows the raw offsets</span>
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<td class="diff-line-num new new_line" data-linenumber="81" 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="LC81" class="line" lang="plaintext">path over a 24<span class="idiff left right"> h</span> period. The graph on the left shows the raw offsets</span>
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<pre style="margin: 0;"> <span id="LC82" class="line" lang="plaintext">produced by the on-wired protocol, while the figure on the right shows</span>
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<pre style="margin: 0;"> <span id="LC83" class="line" lang="plaintext">the filtered offsets produced by the clock filter algorithm. If we</span>
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<pre style="margin: 0;"> <span id="LC84" class="line" lang="plaintext">consider the series formed as the absolute value of the offset samples,</span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="93" 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="93" 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">@@ -93,7 +93,7 @@ sample with lower delay is available. This commonly occurs when an older</td>
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<pre style="margin: 0;"> <span id="LC93" class="line" lang="plaintext">selected sample is discarded from the shift register. The reason for</span>
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<pre style="margin: 0;"> <span id="LC94" class="line" lang="plaintext">this is to preserve causality; that is, time always moves forward, never</span>
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<pre style="margin: 0;"> <span id="LC95" class="line" lang="plaintext">backward. The result can be the loss of up to seven samples in the shift</span>
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<pre style="margin: 0;">-<span id="LC96" class="line" lang="plaintext">register, or <span class="idiff left right">more to the point,</span> the output sample rate can never be less</span>
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<pre style="margin: 0;">+<span id="LC96" class="line" lang="plaintext">register, or <span class="idiff left right">-- more to the point --</span> the output sample rate can never be less</span>
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<pre style="margin: 0;"> <span id="LC97" class="line" lang="plaintext">than one in eight input samples. The clock discipline algorithm is</span>
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<pre style="margin: 0;"> <span id="LC98" class="line" lang="plaintext">specifically designed to operate at this rate.</span>
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<pre style="margin: 0;"> <span id="LC99" class="line" lang="plaintext"></span>
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