Juniper M Series Monitoring And Troubleshooting Manual page 351

Action
Sample Output
Meaning
Copyright © 2012, Juniper Networks, Inc.
To check the airflow, use the following command:
user@host> show chassis environment
user@m40-host> show chassis environment
Class Item
Power Power Supply A
Power Supply B
[...Output truncated...]
Fans Top Impeller
Bottom Impeller
Rear Fan 1
Rear Fan 2
Rear Fan 3
[...Output truncated...]
The command output displays the power supply status and the cooling system status.
When monitoring the power supplies, look at both the power supply status and the
cooling system status. If the cooling system temperature is above a certain level, the
power supplies are automatically cut off.
To check the power supply temperature on M40e and M160 routers, use the following
command:
user@host> show chassis environment pem
user@host> show chassis environment pem
PEM 0 status:
State
Temperature
DC input
DC output
Load
Voltage:
48.0 V input
48.0 V fan supply
5.0 V bias
8.0 V bias
PEM 1 status:
State
Temperature
DC input
DC output
Load
Voltage:
48.0 V input
48.0 V fan supply
5.0 V bias
8.0 V bias
The command output displays the temperature of the air flowing past the power supplies
(PEMs). The status is either
To check the status of a specific power supply, indicate the slot number. For example,
type
show chassis environment pem slot
Status Measurement
OK
Absent
OK Spinning at normal speed
OK Spinning at normal speed
OK Spinning at normal speed
OK Spinning at normal speed
OK Spinning at normal speed
Online
OK
OK
OK
Less than 20 percent
69028 mV
48839 mV
5013 mV
8253 mV
Online
OK
OK
OK
Less than 20 percent
69307 mV
49170 mV
4991 mV
8263 mV
OK or Failed .
, where can be either
slot
Chapter 10: Monitoring Power Supplies
or .
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