Symmetricom XLi IEEE 1588 - Manual (Page 141)

XLi IEEE 1588 Clock 133
997-01510-03, Rev. C, 12/12/2006
2
5
1
S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S S
Request the PTP Slave Synchronization Threshold
Use the following command to review the PTP-allowed slave synchronization threshold in microseconds.
The PTP slave uses the synchronization threshold to determine if it is locked to the PTP master. The XLi
system clock’s frequency steering function also uses the synchronization threshold to determine if it is
locked to its reference clock. To get the PTP slave sync threshold, use the following format:
F131 B<N> SST<CR>
For example, enter:
F131 B4 SST
Response (example):
F131 B4 SST 5 microsec<CR><LF>
Set the PTP Slave Synchronization Threshold
The following command sets the PTP Slave Synchronization Threshold of a 1588 card. This value can
only be set when the 1588 card is configured as a PTP slave. To set the PTP Slave Synchronization
Threshold, use the following format:
F131 B<N><SP>SST<SP><TM>
where:
For example, enter:
F131 B4 SST 5
Response (one of the following lines):
OK - Slave Sync Threshold has been received and applied by the PTP Option Card
ERROR - PTP Clock is not a slave, cannot set SST.
Note: The PTP slave sync threshold are saved in XLi NVRAM so they can be used to initialize the PTP
option card with the allowed slave sync threshold at XLi power-up.
F = ASCII character F
131 = unit function number
<SP> = space
B = ASCII letter to denote Option Bay number follows
<N> = Option Bay Number, 1 through 4.
SST = specify PTP Slave Sync Threshold command
<TM> = Slave Sync Threshold, 5 or 1000 (microseconds)