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r2 - 2004-12-17 - 07:34:00 - HarlanStennYou are here: NTP >  Support Web > OtherDocumentation > NTPRelatedDefinitions
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ntp-4.2.8p13 was released on 07 March 2019. It addresses 1 medium-severity security issue in ntpd, and provides 17 non-security bugfixes and 1 other improvements over 4.2.8p12.

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12.2. NTP-related definitions

Many of the following come from the RFCs.

Jitter
short-term variations in frequency with components greater than 10 Hz. The estimated time error of the peer clock measured as an exponential average of RMS time differences.

Root Delay
the total roundtrip delay to the primary reference source at the root of the synchronization subnet.

Root Dispersion
the maximum error relative to the primary reference source at the root of the synchronization subnet. Only positive values greater than zero are possible.

Wander
long-term variations in frequency with components greater than 10 Hz

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