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Cisco 7401ASR Installation and Configuration Guide
OL-5419-01 B0
Chapter2 Rack-Mounting, Tabletop Installation, and Cabling
Connecting Power
Connecting DC-Input Power
Note The color coding of the DC-input power supply leads depends on the color coding of the DC power
source at your site. Make certain the lead color coding you choose for the DC-input power supply
matches lead color coding used at the DC power source.
Warning
When you install the unit, the ground connection must always be made first and disconnected last.
Warning
Before completing any of the following steps, and to prevent short-circuit or shock hazards, ensure
that power is removed from the DC circuit. To ensure that all power is OFF, locate the circuit breaker
on the panel board that services the DC circuit, switch the circuit breaker to the OFF position, and
tape the switch handle of the circuit breaker in the OFF position.
Connect a DC-input power supply as follows:
Step1 At the front of the router, check that the power switch is in the off (O) position.
Step2 Ensure that no current is flowing through the DC power supply leads. To ensure that all power is OFF,
locate the circuit breaker on the panel board that services the DC circuit, switch the circuit breaker to
the OFF position, and tape the switch handle of the circuit breaker in the OFF position.
Step3 Using a wire stripper, strip approximately 0.55 inch (14 mm) f rom t h e –V and +V leads.
Figure2-18 Attaching the Leads to the DC Plug and the DC Plug to the
DC Connector
Step4 Insert the –V and +V leads into the DC plug that ships with the Cisco 7401A SR router. The plug allows
you to unplug the DC wires from the power supply without having to unscrew the leads.
a. Orient the plug (1) to the connector (4) as shown in Figure2-18. The plug inserts only one way.
Notice the symbols, + A – , embossed on the connector (3). Use the symbols and the orientation of
the plug to guide you when inserting the leads into the plug.
1DC plug 4Single DC power connector
2Lead 5Dual DC power connector
3+ and – embossed on connector
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