Monitoring The Oscillator - Spectracom VelaSync 1232 User Manual

3.4 Managing the Oscillator
Reported TFOM Value
8
9
10
11
12
13
14
15
Example
TFOM is a value between 1 and 15. TFOM can never exceed the default MaxTFOM value
of 15.
Typically the MaxTFOM requires no adjustment, but in some instances it may be advis-
able 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
to be asserted and the oscillator disciplining will change in order to speed-up the
alignment of the system 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
disciplining slows back down again as the system 1PPS continues to be brought into
alignment with the selected 1PPS input.
3.4.2

Monitoring the Oscillator

The Oscillator Management screen provides current and history status information on
disciplining state and accuracy.
To access the
156
Estimated Time Error (ETE)
1 msec < ETE <= 10 msec
10 msec < ETE <= 100 msec
100 msec < ETE <= 1 sec
1 sec < ETE <= 10 sec
10 sec < ETE <= 100 sec
100 sec < ETE <= 1000 sec
1000 sec < ETE <= 10000 sec
ETE > 10000 sec
System 1PPS
Oscillator Management
1PPS out of specification
is now much closer to the
screen:
CHAPTER 3 • VelaSync User's Manual Rev. 3
alarm
reference 1PPS, the