About The "Phase Error Limit; Configuring The Oscillator - Spectracom SecureSync 1200 User Reference Manual

Typically the MaxTFOM requires 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
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.
2.
3.
CHAPTER •
3 SecureSync User Reference Guide Rev. 23
oscillator disciplining will change
To configure the oscillator settings, navigate to MANAGEMENT > OTHER: Disciplining .
Click the GEAR icon at the top of the Status panel. The Oscillators Settings window will
display:
Populate the fields:
3.5 Managing the Oscillator
in order to speed-up the alignment of the sys
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