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).
1PPS Phase Validation: Turn ON Smart Reference Monitoring. See "Reference
Monitoring: Phase" on page281.
4.
Click Submit.
3.5.2.1 Time Figure of Merit (TFOM)
The TFOM reflects the estimated error range values between the reference 1PPS (such as GPS
1PPS) and the System 1PPS which is being aligned to the 1PPS. The estimated error is referred
to as the 1PPS Phase error. TFOM values are ranges of these phase errors. The larger the
phase error estimate, the larger the TFOM value will be. For example, TFOM 3 is reported
when the estimated phase error is any value between 10 ns to less than 100 ns of the offset
between the selected 1PPS reference and the system’s 1PPS.
TFOM is SecureSync’s estimation of how accurately it is synchronized with its time and 1PPS
reference inputs, based on several factors, known as the EstimatedTime Error or ETE. The larger
the TFOM value, the less accurate SecureSync believes it is aligned with its 1PPS input that is
used to perform disciplining. If this estimated error is too large, it could adversely affect the per-
formance of oscillator disciplining. The available TFOM range is 1 through 15. You may refer
to the following for the TFOM to ETE conversions:
Table 3-5:
TFOM to ETE conversion
Reported TFOM Value Estimated Time Error (ETE)
1 <= 1 nsec
2 1 nsec < ETE <= 10 nsec
3 10 nsec < ETE <= 100 nsec
4 100 nsec < ETE <= 1 μsec
5 1 μsec < ETE <= 10 μsec
6 10 μsec < ETE <= 100 μsec
7 100 μsec < ETE <= 1 msec
8 1 msec < ETE <= 10 msec
9 10 msec < ETE <= 100 msec
10 100 msec < ETE <= 1 sec
11 1 sec < ETE <= 10 sec
12 10 sec < ETE <= 100 sec
13 100 sec < ETE <= 1000 sec
3.5 Managing the Oscillator
CHAPTER 3 • SecureSync User Reference Guide Rev. 26
217
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