Cisco ASR 903 Hardware Installation Guide

Installing DC Power Supply Unit (A900-PWR550-D)
Perform the following procedure to install the terminal block.
Step 1
Locate the terminal block plug.
Step 2
Use a wire-stripping tool to strip the ends of each of the two wires coming from the DC-input power source to 0.27 inch
(6.6 mm) ± 0.02 inch (0.5 mm) and the wire for grounding. Do not strip more than 0.29 inch (7.4 mm) of insulation from
the wire. Stripping more than the recommended amount of wire can leave behind exposed wire from the terminal block
plug after installation.
Step 3
Identify the ground, positive, and negative feed positions for the terminal block connection. The recommended wiring
sequence is (see the figure below ):
a) Ground lead wire (left)
b) Negative (-) lead wire (middle)
c) Positive (+) lead wire (right)
Figure 63: DC Power Supply with Lead Wires
Positive (+) lead wire3Ground lead wire1
——Negative (–) lead wire
2
Step 4
Insert the exposed wire of one of the three DC-input power source wires into the terminal block plug. Make sure that
you cannot see any wire lead. Only wire with insulation should extend from the terminal block.
Do not overtorque the plug captive screws of the terminal block. The recommended maximum torque is from
4.425 in.-lb (.5 N-m) to 5.310 in-lb (.6 N-m).
Caution
Cisco ASR 903 Aggregation Services Router Hardware Installation Guide
105
Installing the Cisco ASR 903 Router
Installing the DC Power Supply

Cisco ASR 903 Specifications

General

Brand	Cisco
Model	ASR 903
Category	Network Router
Language	English