System Timing
Page 296 7750 SR OS Basic System Configuration Guide
Forcing a Specific Reference
You can force the system synchronous timing output to use a specific reference.
Note: The debug sync-if-timing force-reference command should only be used to test and debug
problems. Network synchronization problems may appear if network elements are left with this
manual override setting. Once the system timing reference input has been forced, it may be cleared
using the no force-reference command.
When the command is executed, the current system synchronous timing output is immediately
referenced from the specified reference input. If the command forces the BITS input, then both
CPMs will select their local BITS input ports; otherwise, the standby CPM locks to the output of
the active CPM clock.
Note: The 7750 SR-c12 does not have the ability for the standby to look to the active. In this
chassis, the force command is activated on both the active and standby CPM and each locks to the
specified reference.
If the specified input is not available (shutdown), or in a disqualified state, the timing output will
enter a holdover state based on the previous input reference.
On a CPM activity switch, the force command is cleared and normal reference selection is
determined.
Debug configurations are not saved between reboots.
CLI Syntax: debug>sync-if-timing
force-reference {ref1 | ref2 | bits}
Example
: debug>sync-if-timing# force-reference
To Next Page
Need help?
General
