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6 Message Reference
82
Description:
This message is issued by the board to indicate events within the on-board
clocking circuitry.
Parameter Description:
Event ID
This field specifies the event that caused the indication to be generated:
event_id Description
1
PLL entered hold-over mode
Issued by boards acting as primary or secondary clock master when its
nominated clock reference becomes unavailable. The phase-locked-loop
starts operating in “hold-over” mode, continuing to generate an on-board
clock at the same frequency as the last valid reference signal.
2
PLL left hold-over mode
The nominated clock reference for a primary or secondary master board has
become available and the is now being used as the input to the board’s clock
circuitry.
3
CT bus clock set A fail
The CT bus clock set A signals are not being correctly driven.
4
CT bus clock set A recover
The CT bus clock set A signals are being driven.
5 CT bus clock set B fail
The CT bus clock set B signals are not being correctly driven.
6
CT bus clock set B recover
The CT bus clock set B signals are being driven.
7
Master clock changeover
The board issuing this indication has automatically changed from secondary
master to primary master role for the clock set it was configured to drive.