5700MSC-IP
IP Network Grand Master Clock & Video Master Clock System
Revision 0.2 Page - 79
5.3.3.1. Synchronizing the System Oscillator to the Reference Immediately
This action will only be required when the frequency lock type has been set
to Slow. In Slow mode, the 5700MSC-IP
can only gradually adjust its
internal oscillator if it becomes unsynchronized to the frequency reference.
This can occur if the frequency reference is disconnected for a period of
time. The internal oscillator will drift slightly and upon reconnection a slight
difference will exist between the two.
The slow lock process can take a long time. To resolve this discrepancy
immediately, the user can initiate a manual jam of the frequency reference.
The word jam
here is used in the context that the timing and phase
measured on the reference will be jammed into the system oscillator forcing
it into synchronization. Thi
s can cause glitches on all outputs of the
5700MSC-IP and should be used with caution.
To perform a jam of the frequency reference, select the Jam Reference
menu item and press the SELECT button.
5.3.3.2. Synchronizing the System Time to the Reference Immediately
Performing a manual jam of the time reference will only be required when
the time lock type is set to User or Never. In User mode the 5700MSC-IP
will warn whenever system time does not agree with the time reference.
When the lock type is Never, the 5700MSC-IP will ignore the time reference
completely and not generate any warnings. Performing a manual jam with
this menu item is the only way to synchronize the system clock to the time
reference. The word Jam is
used in the context that the time and date
provided by the time reference will be jammed into the system time clock to
synchronize them.
Note that if the time reference is set to SNTP then this forces an immediate
SNTP synchronization.
To perform a jam of reference time/date into system time, select the Jam
Time menu item and press the SELECT button.
When performing a frequency or time reference jam, allow 10 seconds for any jam
warning messages to clear.
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