Typically the MaxTFOMrequires no adjustment, but in some instances it may be advisable to
decrease MaxTFOM so that TFOM can potentially exceed it: For example, by lowering the
MaxTFOM to “5” it is now possible for TFOM to be always higher than the MaxTFOM value:
Assuming the MaxTFOM is set to 5 and the TFOM happens to go to a 6, i.e. TFOM is now
exceeding MaxTFOM. This condition will cause a 1PPS out of specification alarm to be asser
ted and the oscillator disciplining will change in order to speed-up the alignment of the sys
tem 1PPS to the selected reference (causing it to take less time getting closer into alignment with
the reference):
This will cause the TFOM to start to decrease faster. Once TFOM no longer exceeds MaxTFOM
because the System 1PPS is now much closer to the reference 1PPS, the disciplining slows back
down again as the system 1PPS continues to be brought into alignment with the selected 1PPS
input.
3.5.2.2 About the "Phase Error Limit"
Setting a limit (valid for +/-) for the phase error between external 1PPS reference and system
1PPS will cause the disciplining tracking to restart automatically (after a few minutes delay), if
the limit is exceeded, in order to quickly re-align the system 1PPS with a reference.
If you are using a Host Reference as a primary or backup reference, for improved per
formance it is recommended to set the phase error limit for NTP to a suggested value of
100000 ns (= 1 second). Adjust this value as needed, based on your accuracy requirements.
3.5.2.3 Configuring the Oscillator
To configure the oscillator:
1.
To configure the oscillator settings, navigate to MANAGEMENT > OTHER: Disciplining.
2.
Click the GEAR icon at the top of the Status panel. The Oscillators Settings window will
display:
3.
Populate the fields:
3.5 Managing the Oscillator
CHAPTER 3 • SecureSync User Reference Guide Rev. 23
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