1.
Navigate to MANAGEMENT > OTHER: Disciplining.
2.
Click the GEAR icon at the top of the Status panel. The Oscillators Settings win-
dow will display:
3.
Populate the fields:
Maximum TFOM for Sync: When TFOM (Time Figure of Merit, see also
"Time Figure of Merit (TFOM)" on the next page) is greater than Max
TFOM, disciplining will still be attempted against the selected reference to
improve the TFOM. If the condition persists, the system will transition to hold-
over, and eventually out of sync. When disciplining is performed such that
TFOM is no longer greater than max TFOM, the system will transition back
into sync.
Holdover Timeout(s): The default is 7200 s (= 2 hours).
For more information on holdover timeouts, see "Typical Holdover lengths in
seconds" on page196. For additional information on holdover, see "What is
"Holdover Timeout"?" on page194.
Phase Error Limit: [Default=0 (disables this feature)]. Setting a Limit (valid
for +/-) for the Phase Error between an external 1PPS reference and the Sys-
tem 1PPS will cause the disciplining tracking to restart automatically (after a
few minutes delay) if that limit is exceeded. This will help to quickly re-align
the System 1PPS with a reference.
When using a Host Reference as a primary or backup reference, for improved
performance it is recommended to set the phase error limit for NTP to a sug-
gested value of 100000 ns (= 1 µ second). Adjust this value as needed, based
on your accuracy requirements.
3.4 Managing the Oscillator
CHAPTER 3 • VersaSync User Manual Rev. 7.0
199
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