Maintaining The M320 Power Supplies - Juniper M320 Hardware Manual

M320 Multiservice Edge Router Hardware Guide

Maintaining the M320 Power Supplies

Purpose
Action
278
For optimum router performance, verify the condition of the power supplies.
On a regular basis:
The power supplies require an unobstructed airflow at both the front and rear of the
chassis. Periodically check the site to ensure that both the air intake at the bottom
front of the chassis and the exhaust from the power supply faceplates are unobstructed.
Periodically inspect the site to ensure that the grounding cable, DC power cables, and
AC power cords connected to the router are securely in place and that no moisture is
accumulating near the router. To review grounding and site wiring requirements for
the router, see "M320 Chassis Grounding Cable and Lug Specifications" on page 94
and M320 General Electrical Safety Guidelines and Electrical Codes.
Make sure that the DC power cables or AC power cords are arranged so that they do
not obstruct access to other router components.
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 input
Load
48.0 V input
48.0 V fan supply
8.0 V bias
5.0 V bias
PEM 1 status:
State
Temperature
DC input
Load
48.0 V input
48.0 V fan supply
8.0 V bias
5.0 V bias
PEM 2 status:
State
Temperature
DC input
Load
48.0 V input
48.0 V fan supply
8.0 V bias
5.0 V bias
PEM 3 status:
State
Temperature
DC input
Load
48.0 V input
48.0 V fan supply
show chassis environment pem
Online
OK
OK
Less than 20 percent
54701 mV
49165 mV
8505 mV
4991 mV
Online
OK
OK
Less than 20 percent
54219 mV
49002 mV
8485 mV
4996 mV
Online
OK
OK
Less than 20 percent
54701 mV
49165 mV
8505 mV
4991 mV
Online
OK
OK
Less than 20 percent
54219 mV
49002 mV
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