Juniper Core Router T Series Hardware Manual page 326

T320 Core Router Hardware Guide
Solution
Component Alarm Type
Fans Red
Yellow
Temperature sensors Red
Yellow
298
The following alarms and LEDs indicate a problem when:
A fan fails (red alarm).
One of the fan trays is removed (yellow alarm).
The router temperature exceeds the "temperature warm" threshold (yellow alarm).
The temperature of the router exceeds the maximum ("temperature hot") threshold
(red alarm and automatic shutdown of the power supplies).
To troubleshoot the fans, follow these guidelines:
If the red alarm LED on the craft interface lights, find the source of the problem by
looking at the display on the craft interface. The number of alarm conditions, as well
as the source of each alarm, appears on the screen.
Use the CLI to check the status of the fans. For example, you can issue the following
command to get information about the source of an alarm condition:
user@host> show chassis alarms
Place your hand near the exhaust vents at the rear of the chassis to determine whether
the fans are pushing air out of the chassis.
If the DC OK LED on one or both of the power supplies is not lit, check the power supply
fans to see if they are operating.
If all power supplies have failed, the system temperature might have exceeded the
threshold, causing the system to shut down.
If the display on the craft interface lists only one fan failure and the other fans are
functioning normally, the fan is probably faulty and you need to replace the fan tray,
as described in "Replacing a T320 Fan Tray" on page
LCD Display Message
Fan Failure
Fans Missing
Fan Removed
Temperature Hot
Sensor Failure
Temperature Warm
199.
CLI Message
fan-name Failure
Too many fans missing or failing
fan-name Removed
Temperature Hot
Temperature sensor failure
Temperature Warm
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