To clean the transceivers, use an appropriate fiber-cleaning device, such as RIFOCS
Fiber Optic Adaptor Cleaning Wands (part number 946). Follow the directions for the
cleaning kit you use.
After you have cleaned the transceiver on the fiber-optic PIC, make sure that the
connector tip of the fiber-optic cable is clean. Use only an approved alcohol-free
fiber-optic cable cleaning kit, such as the Opptex Cletop-S
®
Fiber Cleaner. Follow the
directions for the cleaning kit you use.
Related
Documentation
M120 PICs Description on page 57•
• Replacing an M120 PIC on page 223
• Replacing an M120 PIC Cable on page 228
• Troubleshooting M120 PICs on page 288
Maintaining the M120 Power Supplies
Purpose For optimum router performance, verify the condition of the power supplies.
Action Check the status of the power supplies by issuing the show chassis environment pem
command. The output is similar to the following:
•
user@host> show chassis environment pem
PEM 0 status:
State Online
Temperature OK
DC output OK
PEM 1 status:
State Online
Temperature OK
DC output OK
• Make sure that the power and grounding cables are arranged so that they do not
obstruct access to other router components.
• Routinely check the OK and the STATUS OK LEDs on the power supply faceplates and
the craft interface. If these output status LEDs are lit, the power supplies are functioning
normally. For more information about the power supply LEDs, see “M120 Power Supply
LEDs” on page 73.
• Check the red and yellow alarm LEDs on the craft interface. Power supply failure or
removal triggers an alarm that causes one or both of the LEDs to light. You can display
the associated error messages by issuing the following CLI command:
user@host> show chassis alarms
For a list of possible alarm messages, see “Troubleshooting Using the Chassis and
Interface Alarm Messages” on page 284.
• Periodically inspect the site to ensure that the grounding and power cables connected
to the router are securely in place and that there is no moisture accumulating near the
277Copyright © 2018, Juniper Networks, Inc.
Chapter 31: Maintaining Components and Cables
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