Connecting the M320 Router to an External Clocking Device
The M320 router contains two external clock input (EXTERNAL CLOCK INPUTS) ports on each control board (CB)
labeled A or B.
To connect the router to external clocking devices, connect a cable with RJ-45 connectors to each external clock input port:
- Attach an electrostatic discharge (ESD) grounding trap on your bare wrist, and connect the strap to one of the ESD points on the chassis.
- Plug one end of the RJ-45 cable into the external clock input ports on the front of the CB.
- Plug the other end of the RJ-45 cable into the E1 or T1 external clocking device.
- Verify that the LEDs for the external clock inputs are lit steadily green.
- Repeat the cabling procedures as needed for the other CB.
- Configure the port. See the synchronization statement for M Series and T Series in the Junos OS Administration Library.
- Issue the show chassis synchronization command
to check the status of the port.
user@host> show chassis synchronizationClock Synchronization Status : Clock module on CB 0 Current state : master Current clock state : internal Selected for : 4 days, 11 hours, 9 minutes, 26 seconds Selected since : 2012-11-08 02:37:37 PST Deviation (in ppm) : +0.00 Last deviation (in ppm): +0.01 Clock Synchronization Status : Clock module on CB 1 Current state : backup Current clock state : locked to master CB Selected for : 10 days, 9 hours, 34 minutes, 28 seconds Selected since : 2012-11-02 05:12:35 PDT