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Cisco ASR 903 Router Hardware Installation Guide
OL-25178-04
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 power—19.2VDC to -72VDC
The DC power supply uses 3 position terminal block-style connector with positive latching/securing
and labeled connections for +24/48V, GRD, -24/48V. The terminal block connector is of suitable
size to carry the appropriate AWG wire size to handle the input current of the power supply. No
ON/OFF switch is provided.
• AC power—85VAC to 264VAC
The AC power supply has an IEC 320-type power receptacle and a 15 Amp service connector. You
can use standard right angle power cords with the AC power supply. The power supply includes a
power cord retainer. No ON/OFF switch is provided.
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 GR-1089 NEBS
standard for electromagnetic compatibility and safety.
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 3-17
• Power Connection Guidelines, page 3-18
• Installing the DC Power Supply, page 3-19
• Removing and Replacing the DC Power Supply, page 3-24
• Installing the AC power Supply, page 3-25
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.