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Troubleshooting the TX Matrix Plus Cooling System

 

Problem:

Description:

The following alarms, LEDs, and other indications indicate a problem with the cooling system:

  • An alarm occurred as shown in Table 1.

  • A FAIL LED for a fan tray on the craft interface is lit red.

  • An OK LED for a fan tray on the craft interface is not lit.

  • One or more fan trays is operating at an increased speed.

  • The power supplies were automatically shut down because the temperature of the TX Matrix Plus router exceeded the maximum (“temperature hot”) threshold.

Solution

To troubleshoot the cooling system:

  1. Look at the LEDs on the craft interface. The following LEDs indicate a problem:
    • Fail LED for a fan tray is lit red.

    • Red alarm LED on the craft interface is lit.

  2. 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.
  3. 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.
  4. Use the show chassis fan command to verify that the status of each fan is OK and that each of the fans are Spinning at normal speed. Fan Tray 0 and Fan Tray 1 refer to the fans in the upper and lower front fan trays, and Fan Tray 2 through Fan Tray 6 refer to fans in the rear fan trays.
    user@host> show chassis fan
  5. Use the show chassis environment sfc 0 command to verify that the status of each component is OK.
    user@host> show chassis environment sfc 0
  6. Use the show chassis temperature-thresholds to show the temperature thresholds for various components.
    user@host> show chassis temperature-thresholds
  7. Issue the show chassis alarms sfc 0 command to get information about the source of an alarm condition:
    user@host> show chassis alarms sfc 0
    • Temperature hot:

      • PEM OK LED on one or both of the power supplies is not lit—Verify that the power supply fans are operating.

      • FAULT LED on one or both of the power supplies is lit—Verify that the power supply fans are operating.

      • If both power supplies fail, the system temperature might have exceeded the threshold, causing the system to shut down. If the TX Matrix Plus router temperature exceeds the acceptable maximum, the TXP-CB turns off the power supplies.

    • Fan Failure—If the other fans are functioning normally, a fan is probably faulty and you need to replace the fan tray.

For information about the alarms, see Table 1.

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 Plus 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.