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Upgrading the Rear Fan Tray in a T640 Router Before Integrating the Router into a Routing Matrix

 

To replace the rear fan tray:

  1. Attach an electrostatic discharge (ESD) grounding strap to your bare wrist, and connect the strap to one of the ESD points on the chassis.
  2. Replace the rear fan tray with the model required for a converted T640 router. Use the standard replacement procedure described in the T640 Core Router Hardware Guide. To display the status of the fans in the router, issue the show chassis environment command. The output is similar to the following:
    user@host> show chassis environment
    Caution

    To maintain proper cooling, do not operate the T640 router with the rear fan tray removed for more than 1 minute.