Spectracom VelaSync 1225, Руководство пользователя

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1.
Navigate to MANAGEMENT > OTHER: Disciplining .
2.
The Oscillator Management screen will display. It consists of two panels:
The Oscillator Status Panel
This panel provides comprehensive information on the current status of VelaSync's tim-
ing state.
Oscillator Type : Type of oscillator installed in the unit.
Disciplining State : State of oscillator control and disciplining; indicates whether or
not the internal oscillator is currently being disciplined (steered to an input ref-
erence). The states are: "Warm up", "Calibration", "Tracking Setup", "Lock
State", "Freerun", and "Fault".
1PPS Phase Error : A tracking measurement [scaled time, in ns, or ms] of the
internal 1PPSs' phase error with respect to the selected input reference. Long
holdover periods or an input reference with excessive jitter will cause the phase
error to be high. The oscillator disciplining control will gradually reduce the phase
error over time. Alternatively, restarting the tracking manually (see "Restart
Tracking" under
"Configuring the Oscillator" on page 153 ), or automatically via a
pre-set Phase Error Limit, will quickly reduce the phase error.
10 MHz Frequency Error : An internal estimated calculation (in Hertz) of the
internal oscillator's frequency error, based on the phase accuracy error at the
beginning and end of a frequency measurement window (the length of this win-
4.7 Quality Management
CHAPTER
4
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VelaSync User's Manual Rev. 3 193