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Cisco ASR 9001 and Cisco ASR 9001-S Routers Hardware Installation Guide
Chapter3 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 DCwiring, 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 reverse voltage protection circuitry to prevent damage to the module if it
detects a reverse polarity condition. No damage should 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 Power Connection
Guidelines, page 1-12.
Note To ensure that power remains off while you are performing this procedure, follow proper lockout /tagout
procedures as defined by your company in accordance with local and national laws.
Use this procedure to connect the DC source power cables to a DC power module:
Step1 Verify that the power switch is set to the OFF position.
Step2 Connect the DC power cables in the following order (Figure3-14):
a. Positive cables first.
b. Negative cable last.
Step3 Repeat Step 2 for the other power modules installed in the chassis.
Caution 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 (–).