Connecting Power To A Dc-Powered Router - Cisco ASR 9001 Hardware Installation Manual

Connecting Power to a DC-Powered 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
• Green (or green and yellow) cable typically indicates that it is a ground cable.
DC power modules contain reverse voltage protection circuitry to prevent damage to the module if it
Caution
detects a reverse polarity condition. No damage should occur from reverse polarity, but you should correct
a reverse-polarity condition immediately.
The length of the cables depends on the location of your router in relation to the source of DC power.
Note
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
Guidelines, on page
To ensure that power remains off while you are performing this procedure, follow proper lockout /tagout
Note
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:
Procedure
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 the figure below):
1 Positive cables first.
2 Negative cable last.
Step 3 Repeat Step 2 for the other power modules installed in the chassis.
Cisco ASR 9001 and Cisco ASR 9001-S Routers Hardware Installation Guide
82
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.
13.
Installing Modules and Cables in the Chassis
Power Connection