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Cisco ASR 903 Router Hardware Installation Guide
OL-25178-05
Chapter3 Installing the Cisco ASR 903 Router
Installing the Power Supply
Note The Cisco ASR 903 Router power supplies are hot-swappable. If you have installed redundant power
supply modules, you can replace a single power supply without interrupting power to the router.
Caution To avoid erroneous failure messages, allow at least 2 minutes for the system to reinitialize after a power
supply has been removed or replaced.
Warning
When you install the unit, the ground connection must always be made first and disconnected last.
Statement 1046
Warning
Before performing any of the following procedures, ensure that power is removed from the DC circuit.
Statement 1003
Warning
Only trained and qualified personnel should be allowed to install, replace, or service this equipment.
Statement 1030
Warning
Installation of the equipment must comply with local and national electrical codes.
Statement 1074
Follow these steps to remove and replace the DC power supply on the CiscoASR 903 Router:
Step1 Before servicing the power supply, switch off the circuit breaker in your equipment area. As an
additional precaution, tape the circuit-breaker switch in the Off position.
Step2 Slip on the ESD-preventive wrist strap that was included in the accessory kit.
Step3 Switch the power supply circuit-breaker switch to the Off (O) position.
Step4 Pull the terminal block plug connector out of the terminal block head in the power supply.
Step5 Loosen the captive screws on the DC power supply.
Step6 Grasping the power supply handle with one hand, pull the power supply out from the chassis while
supporting it with the other hand.
Step7 Replace the DC power supply within 5 minutes. If the power supply bay is to remain empty, install a
blank filler plate (Cisco part number A900-PWR-BLANK) over the opening, and secure it with the
captive installation screws.
Installing the AC power Supply
The following sections describe how to install a AC power supply in the CiscoASR 903 Router:
•Installing the AC Power Supply Module, page 3-28
•Activating the AC Power Supply, page3-28