Maximum TFOM for Sync: When TFOM (Time Figure of Merit, see below) 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 holdover, 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 page193. For additional information on holdover, see "What is
"Holdover Timeout"?" on page191.
Phase Error Limit: [Default=0 (disables the feature)]. See "About the "Phase Error
Limit"" on the previous page.
Restart Tracking: Check this box, and click Submit if you want to manually restart
disciplining tracking.
This option causes the disciplining algorithm to stop tracking the input reference
and start over (as if it was just acquired). This can be useful if there is a large
phase offset between reference 1PPS and system 1PPS, as it may occur when
going back into sync to the external reference after a long holdover. A Restart
Tracking will re-align the system 1PPS with the reference 1PPS very quickly, but
may cause the 1PPS output to jump.
Recalibrate: In rare cases, existing calibration data may no longer be suitable to
calibrate the oscillator. This function will delete the existing calibration data, and
begin a new calibration process (not applicable for low phase-noise Rubidium
oscillators).
4.
Click Submit.
3.5.3 Monitoring the Oscillator
The Oscillator Management screen provides current and history status information on dis
ciplining state and accuracy.
To access the Oscillator Management screen:
198
CHAPTER 3 • SecureSync User Reference Guide Rev. 23
3.5 Managing the Oscillator
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