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Maintaining Cooling System Components

This section discusses the following topics:

Maintaining the Air Filter

A dirty air filter restricts airflow in the unit, reducing the ventilation of the chassis. The filter degrades over time. Periodically replace the filter in use, as well as spares. We recommend that you replace the filter every 6 months. For procedures to replace the air filter, see Replacing the Air Filter.

Caution: Always keep the air filter in place while the services gateway is operating. Because the fans are very powerful, they could pull small bits of wire or other materials into the device through the unfiltered air intake. This could damage the device components.

Use spare filters within one year of manufacture. Check the date of manufacture printed on the filter. Store spare air filters in a dark, cool, and dry place. Storing air filters at higher temperatures, or where they can be exposed to ultraviolet (UV) radiation, hydrocarbon emissions, or vapors from solvents, can significantly reduce their life.

Maintaining the Fan Tray

The fan tray contains multiple fans that work in unison to cool the services gateway components. If one fan fails, the host subsystem adjusts the speed of the remaining fans to maintain proper cooling. A red alarm is triggered when a fan fails, and a yellow alarm and red alarm is triggered when a fan tray is removed.

To display the status of the cooling system, issue the show chassis environment command. The output is similar to the following:


user@host> show chassis environment
Class Item                           Status     Measurement
Temp  PEM 0                          OK         35 degrees C / 95 degrees F
      PEM 1                          OK         35 degrees C / 95 degrees F
      PEM 2                          Absent
      PEM 3                          Absent
      Routing Engine 0               OK         35 degrees C / 95 degrees F
      Routing Engine 1               Absent
      CB 0 Intake                    OK         29 degrees C / 84 degrees F
      CB 0 Exhaust A                 OK         30 degrees C / 86 degrees F
      CB 0 Exhaust B                 OK         31 degrees C / 87 degrees F
      CB 0 ACBC                      OK         29 degrees C / 84 degrees F
      CB 0 SF A                      OK         37 degrees C / 98 degrees F
      CB 0 SF B                      OK         32 degrees C / 89 degrees F
      CB 1 Intake                    Absent
      CB 1 Exhaust A                 Absent
      CB 1 Exhaust B                 Absent
      CB 1 ACBC                      Absent
      CB 1 SF A                      Absent
      CB 1 SF B                      Absent
      FPC 0 Intake                   OK         33 degrees C / 91 degrees F
      FPC 0 Exhaust A                OK         29 degrees C / 84 degrees F
      FPC 0 Exhaust B                OK         32 degrees C / 89 degrees F
      FPC 0 pfe0/I3 TSensor          OK         29 degrees C / 84 degrees F
      FPC 0 pfe0/I3 Chip             OK         38 degrees C / 100 degrees F
      FPC 0 pfe1/I3 TSensor          OK         32 degrees C / 89 degrees F
      FPC 0 pfe1/I3 Chip             OK         37 degrees C / 98 degrees F
      FPC 0 pfe0/XLR TSensor         OK         35 degrees C / 95 degrees F
      FPC 0 pfe0/XLR Chip            OK         44 degrees C / 111 degrees F
      FPC 0 pfe1/XLR TSensor         OK         28 degrees C / 82 degrees F
      FPC 0 pfe1/XLR Chip            OK         43 degrees C / 109 degrees F
      FPC 0 IA TSensor               OK         35 degrees C / 95 degrees F
      FPC 0 IA Chip                  OK         38 degrees C / 100 degrees F
      FPC 0 Forbes 0 TSensor         OK         27 degrees C / 80 degrees F
      FPC 0 Forbes 0 Chip            OK         44 degrees C / 111 degrees F
      FPC 0 Forbes 1 TSensor         OK         29 degrees C / 84 degrees F
      FPC 0 Forbes 1 Chip            OK         43 degrees C / 109 degrees F
      FPC 2 Intake                   OK         29 degrees C / 84 degrees F
      FPC 2 Exhaust A                OK         35 degrees C / 95 degrees F
      FPC 2 Exhaust B                OK         37 degrees C / 98 degrees F
      FPC 2 I3 0 TSensor             OK         38 degrees C / 100 degrees F
      FPC 2 I3 0 Chip                OK         46 degrees C / 114 degrees F
      FPC 2 I3 1 TSensor             OK         37 degrees C / 98 degrees F
      FPC 2 I3 1 Chip                OK         39 degrees C / 102 degrees F
      FPC 2 I3 2 TSensor             OK         37 degrees C / 98 degrees F
      FPC 2 I3 2 Chip                OK         40 degrees C / 104 degrees F
      FPC 2 I3 3 TSensor             OK         34 degrees C / 93 degrees F
      FPC 2 I3 3 Chip                OK         36 degrees C / 96 degrees F
      FPC 2 IA 0 TSensor             OK         43 degrees C / 109 degrees F
      FPC 2 IA 0 Chip                OK         40 degrees C / 104 degrees F
      FPC 2 IA 1 TSensor             OK         38 degrees C / 100 degrees F
      FPC 2 IA 1 Chip                OK         42 degrees C / 107 degrees F
Fans  Top Rear Fan                   OK         Spinning at normal speed
      Bottom Rear Fan                OK         Spinning at normal speed
      Top Middle Fan                 OK         Spinning at normal speed
      Bottom Middle Fan              OK         Spinning at normal speed
      Top Front Fan                  OK         Spinning at normal speed
      Bottom Front Fan               OK         Spinning at normal speed

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