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Connecting Power to a DC-Powered Router
Step 5
Close the cable wrap to secure the AC power cord plug to the power module receptacle.
Step 6
Plug the other end of the AC power cord into the AC source receptacle.
Step 7
Proceed to
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.
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
page
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:
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.
Cisco ASR 9901, ASR 9001, and ASR 9001-S Routers Hardware Installation Guide
96
Powering on the Router, on page
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.
17.
Installing Modules and Cables in the Chassis
98.
Power Connection Guidelines, on
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