r7 - 2014-12-22 - 07:05:07 - DavidTaylorYou are here: NTP >  Support Web > ConfiguringNTP > ConfiguringRefclocks > ConfiguringAtomRefclocks
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ntp-4.2.8p15 was released on 23 June 2020. It addresses 1 medium-severity security issue in ntpd, and provides 13 non-security bugfixes over 4.2.8p13.

Please see the NTP Security Notice for vulnerability and mitigation details.

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REFACTOR See ConfiguringAtomRefclocksDev for discussion of this topic.

6.1.1. Configuring ATOM (PPS) Refclocks

The ATOM refclock is built by default. Building is enabled/disabled by the option --enable-ATOM or --disable-ATOM in the 'configure' command line, for example: ./configure --enable-ATOM

The driver will look for the PPS signal on /dev/ppsX, where X is the unit number (0-4) on the server 127.127.22.X line in your ntp.conf file.

Note that some refclocks have builtin support for a PPS signal and do not currently use the ATOM driver. See bug_small.png Bug #557 and LoseThePerDriverPPSCode for more information.

Note that the current kernel-mode Windows PPS driver (serialPPS.sys download) does not support inverted polarity on the DCD line - it must be asserted (positive going) on the leading edge of the second.

Related Topics: AtomRefclockUsers

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