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22 <li class="inline"><a href="#clockhop">3. Anti-Clockhop Algorithm</a></li>
31 …hase one discovers the available <em>sources</em> and mobilizes an association for each source fou…
32 <p> Phase two selects the <em> candidates</em> from among the sources by excluding those sources …
37 <h4 id="clockhop">3. Anti-Clockhop Algorithm</h4>
38 …-clockhop algorithm is intended for cases where multiple servers are available on a fast LAN with…
39 …or list sorted by increasing root distance. The algorithm initializes the -<em>clockhop threshol…
40 <p>The anti-clockhop algorithm is called immediately after the combine algorithm. If there was no o…
42 …and mitigation rules involved depends on how the various synchronization sources are classified. T…
44 … driver associations</i> of one kind or another. In general, one or more sources of either type w…
45 …<li>If all sources have been lost and one or more hosts on a common DMZ network have specified t…
46 …-per-second (PPS) signals and PPS signals are being received, it is designated the <i>PPS driver.<…
47 …atum greater than zero) should all sources fail, or as the primary source (stratum zero) whether o…
48 …modem driver</i>. It is used either as a backup source, should all other sources fail, or as the …
51 …le sources of different types. When used with the <tt>server</tt> or <tt>peer</tt> commands, the <…
60 the combined backup sources continue to discipline the system clock.</p>
62 …the others are discarded. For this purpose the metric is defined as the four-octet IPv4 address or…
80 …described in previous sections. The <tt>flag</tt> option enables the PPS signal for the selected d…
81 <p>A common scenario is a GPS driver with a serial timecode and PPS signal. The
82 PPS signal is disabled until the system clock has been set by some means, not
84 signal, the GPS driver is designated the PPS driver and the PPS signal disciplines
85 the system clock. If the serial timecode becomes unreliable, or if the PPS signal is
87 becomes unreachable and is replaced by other sources.</p>
88 <p>Whether or not the GPS driver disables the PPS signal when the timecode becomes unreliable is
89 …signal is disabled in this case; however, when the GPS receiver has a precision holdover oscillato…