Chapter 3 Installing the Cisco ASR 903 Router
Installing the Power Supply
Installing the Power Supply
The Cisco ASR 903 Router router provides the choice of two different power supplies:
•DC
The DC power supply uses 3 position terminal
•AC
The AC power supply has an IEC
Each power supply provides a single primary input power connection. You can install dual power supplies for redundancy.
Warning Read the installation instructions before connecting the system to the power source. Statement 10
Note Products that have an AC power connection are required to have an external surge protective device (SPD) provided as part of the building installation to comply with the Telcordia
Caution Do not use interface module and power supply ejector handles to lift the chassis; using the handles to lift the chassis can deform or damage the handles.
The following sections describe the Cisco ASR 903 Router power supplies:
•Preventing Power Loss, page
•Power Connection Guidelines, page
•Installing the DC Power Supply, page
•Removing and Replacing the DC Power Supply, page
•Installing the AC power Supply, page
Preventing Power Loss
Use the following guidelines to prevent power loss to the router.
•To prevent loss of input power, ensure that the total maximum load on each circuit supplying the power supplies is within the current ratings of the wiring and breakers.
•In some systems, you can use an UPS to protect against power failures at your site. Avoid UPS types that use ferroresonant technology. These UPS types can become unstable with systems like the Cisco ASR 903 Router, which can have substantial current draw fluctuations due to bursty data traffic patterns.
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