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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 DC Power Supply
The following sections describe how to install a DC power supply in the Cisco ASR 903 Router:
• Installing the DC Power Supply Module, page 3-19
• Installing the Terminal Block, page 3-20
• Activating the DC Power Supply, page 3-23
Note This equipment is suitable for installation in Network Telecommunications Facilities and locations
where the NEC applies.
Note This equipment is suitable for installations utilizing the Common Bonding Network (CBN).
Note The grounding architecture of this product is DC-Isolated (DC-I) for DC-powered products.
DC-powered products have a nominal operating DC voltage of 48 VDC.
Installing the DC Power Supply Module
Perform the following procedure to install the power supply module:
Step 1 Ensure that the system (earth) ground connection has been made. For ground connection installation
instructions, see the “Installing the Chassis Ground Connection” section on page 3-5.
Step 2 If necessary, remove the blank power supply filler plate from the chassis power supply bay opening by
loosening the captive installation screws.
Step 3 Verify that power to the DC circuit connected to the power supply you are installing is off. To ensure that
power has been removed from the DC circuits, locate the circuit breakers for the DC circuits, switch the
circuit breakers to the OFF position, and tape the circuit-breaker switches in the OFF position.
Step 4 Grasp the power supply handle with one hand. Place your other hand underneath the power supply, as
shown in Figure 3-16. Slide the power supply into the power supply bay. Make sure that the power
supply is fully seated in the bay.