Upgrading the Rear Fan Tray in a T640 Router Before Integrating the Router into a Routing Matrix
To replace the rear fan tray:
- Attach an electrostatic discharge (ESD) grounding strap to your bare wrist, and connect the strap to one of the ESD points on the chassis.
- 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... Rear Tray Top fan OK Spinning at normal speed Rear Tray Second fan OK Spinning at normal speed Rear Tray Third fan OK Spinning at normal speed Rear Tray Fourth fan OK Spinning at normal speed Rear Tray Fifth fan OK Spinning at normal speed Rear Tray Sixth fan OK Spinning at normal speed Rear Tray Seventh fan OK Spinning at normal speed Rear Tray Bottom fan OK Spinning at normal speed ...
Caution: To maintain proper cooling, do not operate the T640 router with the rear fan tray removed for more than 1 minute.
