Orolia Spectracom VelaSync 1232, User Manual

Page: 166 / 268

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 facing 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 151 . For additional information on holdover, see "What is
"Holdover Timeout"?" on page 149 .
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.
154
CHAPTER
3
•
VelaSync 1232 User Manual Rev. 4
3.4 Managing the Oscillator