To connect the router to external clocking devices, connect a cable with RJ-45 connectors
to each external clock input port:
1. Attach an electrostatic discharge (ESD) grounding trap on your bare wrist, and connect
the strap to one of the ESD points on the chassis.
2. Plug one end of the RJ-45 cable into the internal clock port on the craft interface.
3. Plug the other end of the RJ-45 cable into the T1 or E1 external clocking device.
4. Verify that the LEDs for the external clock inputs are lit steadily green.
5. Configure the port. See the synchronization statement for M Series and T Series in the
Junos OS Administration Library.
6. Issue the show chassis synchronization command to check the status of the port.
user@host> show chassis synchronization
Clock Synchronization Status :
Clock module on CB 0
Current state : master
Current clock state : internal
Selected for : 13 days, 23 hours, 15 minutes, 17 seconds
Selected since : 2012-10-29 18:28:35 EDT
Deviation (in ppm) : +0.00
Last deviation (in ppm): +0.00
Clock Synchronization Status :
Clock module on CB 1
Current state : backup
Current clock state : locked to master CB
Selected for : 13 days, 23 hours, 14 minutes, 23 seconds
Selected since : 2012-10-29 18:29:29 EDT
Related
Documentation
M120 Control Board (CB) Description on page 47•
• M120 External Clock Interface Ports on the Craft Interface on page 16
Connecting PIC Cables to the M120 Router
After installing the router into the rack as described in “Installing the M120 Router Using
a Mechanical Lift” on page 125 or “Installing the M120 Router Without Using a Mechanical
Lift” on page 139, complete the installation by connecting management and alarm devices,
PICs, and power cables.
Now connect PICs to the network by plugging in network cables. To connect cable to the
PICs (see Figure 57 on page 166, which shows a fiber-optic PIC):
Copyright © 2018, Juniper Networks, Inc.164
M120 Multiservice Edge Router Hardware Guide
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