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Troubleshooting the TX Matrix Cooling System

 

Problem:

Description:

The following conditions automatically cause the fans to run at full speed and also trigger the indicated alarm:

  • A fan fails (red alarm).

  • One of the fan trays is removed (yellow alarm).

  • The TX Matrix router temperature exceeds the “temperature warm” threshold (yellow alarm).

  • The temperature of the TX Matrix router exceeds the maximum (“temperature hot”) threshold (red alarm and automatic shutdown of the power supplies).

Solution

To troubleshoot the fans:

  • 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 scc

    For information about the alarms, see Table 1.

    To display the status of the fans in the TX Matrix router, issue the show chassis environment scc command. The output is similar to the following:

    user@host> show chassis environment scc
  • 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.

The text in the column labeled ”LCD Message” appears in the display of the craft interface. The text in the column labeled “CLI Message” appears in the output from the show chassis alarms command.

Table 1: TX Matrix Chassis Alarm Messages for the Cooling System

Component

Alarm Type

LCD Message

CLI Message

Alarm Condition

Recovery

Fans

Red

Fan Failure

fan-name Failure

A fan has failed.

Replace the fan tray.

Fans Missing

Too many fans missing or failing

A fan tray is missing or too many fan trays have failed.

Reinstall the fan tray in the chassis.

Yellow

Fan Removed

fan-name Removed

A fan tray has been removed.

Reinstall the fan tray in the chassis.

Temperature sensors

Red

Temperature Hot

Temperature Hot

The chassis temperature exceeded the hot temperature threshold. If this condition persists, the router shuts down.

  • Verify that the room temperature is within acceptable limits.

  • Verify that there is sufficient airflow.

  • Verify that the cooling system in the chassis are operating properly.

Sensor Failure

Temperature sensor failure

A temperature sensor failed.

Contact JTAC.

Yellow

Temperature Warm

Temperature Warm

The chassis temperature exceeded the warm temperature threshold.

  • Verify that the room temperature is within acceptable limits.

  • Verify that there is sufficient airflow.

  • Verify that the cooling system in the chassis are operating properly.