Chapter 1 Cisco XR 12404 Router Overview
Fan Tray Assembly
The status LEDs on the DC PEM provide information about the current operational status of the power supply. Table
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LED Label |
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Output OK |
| Green | PEM is powered on and operating normally. |
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Input OK |
| Green | DC power is present at the PEM input and |
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| within the specified limits. |
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Output Fail |
| Amber | Indicates a failure in the PEM. |
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Power Distribution
The backplane distributes power through the Cisco XR 12404 router and to all cards in the card cage. The PEM converts AC power source into
Power for the fan tray assembly is supplied directly from the backplane. An internal fan tray assembly controller card converts
Fan Tray Assembly
The Cisco XR 12404 router is equipped with a fan tray assembly located at the side of the chassis. The fan tray assembly maintains acceptable operating temperatures for the internal components by drawing cooling air across the card cage.
| Cisco XR 12404 Router Installation Guide |