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Cisco ASR 9001 and Cisco ASR 9001-S Routers Hardware Installation Guide
OL-26701-02
Chapter 3 Installing Modules and Cables in the Chassis
Connecting Power to the Router
Connecting Power to a DC-Powered Router
This section contains the procedures to connect the DC source power cables to a DC-powered router.
The color coding of source DC power cable leads depends on the color coding of the site DC power
source. Because there is no color code standard for source DC wiring, you must be sure that power
source cables are connected to the power module with the proper positive (+) and negative (–) polarity:
• In some cases, the source DC cable leads might have a positive (+) or a negative (–) label. This is a
relatively safe indication of the polarity, but you must verify the polarity by measuring the voltage
between the DC cable leads. Be sure that the positive (+) and negative (–) cable leads match the
positive (+) and negative (–) labels on the power module when making the measurement.
• Green (or green and yellow) cable typically indicates that it is a ground cable.
Caution DC power modules contain circuitry to trip the breaker on the power module if the power module detects
a reverse polarity condition. No damage would occur from reverse polarity, but you should correct a
reverse-polarity condition immediately.
Note The length of the cables depends on the location of your router in relation to the source of DC power.
These cables are not available from Cisco Systems. They are available from external commercial cable
vendors. For more information on site power and source DC cable requirements, see the “Power
Connection Guidelines” section on page 1-12.
Note To ensure that power remains off while you are performing this procedure, tape the DC circuit breaker
switch in the off (0) position.
Use this procedure to connect the DC source power cables to a DC power module:
Step 1 Verify that the power switch is set to the OFF position.
Step 2 Connect the DC power cables in the following order (see Figure 3-12):
a. Ground cables first.
b. Positive cables next.
c. Negative cable last.
Step 3 Repeat Step 2 for the other power modules installed in the chassis.
Warning
To prevent injury and damage to the equipment, always attach the ground and source DC power cable
to power module terminals in the following order: (1) ground to ground, (2) positive (+) to positive (+),
(3) negative (–) to negative (–).
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