Chapter 4 Troubleshooting the System
Managing the Cisco uBR7246 VXR Clock Card
Force Alternate Clock
To select the external timing source when the clock card is in holdover mode, use the cable clock force global configuration command. To disable the selection and return to the default, use the no form of this command.
cable clock force {primary secondary} no cable clock force
Setting the cable clock to primary forces the primary source to act as the clock reference. Setting the cable clock to secondary forces the secondary source to act as the clock reference.
The clock card automatically uses the primary external source, if available. If the primary source fails, the clock card enters holdover mode and after a few seconds, switches to the secondary external source. The clock card switches back to the primary source when it becomes available.
Note This command overrides the default behavior of the clock card, when the clock card is in holdover mode. If the clock card is not in holdover mode, this command is ignored. You cannot force the reference to a port if the clock card is in
Set Midplane TDM Clock as Primary Reference
To make the midplane TDM clock the primary timing reference for the clock card, use the cable clock
cable clock
Note Because the clock card automatically provides the timing reference to the midplane TDM clock, the midplane cannot in turn act as the reference for the clock card. This means that the cable clock
Caution Although the cable clock
Display Clock Values
To display clock reference status information for the clock card, use the show cable clock privileged EXEC command:
show cable clock
Cisco uBR7200 Series Universal Broadband Router Software Configuration Guide
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