Maintaining The M120 Power Supplies - Juniper M120 Hardware Manual

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Maintaining the M120 Power Supplies

Purpose
Action
Copyright © 2018, Juniper Networks, Inc.
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
directions for the cleaning kit you use.
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
For optimum router performance, verify the condition of the power supplies.
Check the status of the power supplies by issuing the
command. The output is similar to the following:
user@host> show chassis environment pem
PEM 0 status:
State
Temperature
DC output
PEM 1 status:
State
Temperature
DC output
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
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
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
Interface Alarm Messages" on page
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
Chapter 31: Maintaining Components and Cables
Online
OK
OK
Online
OK
OK
and the STATUS OK LEDs on the power supply faceplates and
"Troubleshooting Using the Chassis and
284.
®
Fiber Cleaner. Follow the
show chassis environment pem
"M120 Power Supply
277