Cisco XR 12410 - Manual (Page 128)

Chapter 3 Installing the Cisco XR 12410 Router
Connecting Power to the Router
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Cisco XR 12410 and Cisco XR 12810 Router Installation Guide
OL-17441-01
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 PDU
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 PDU when making the measurement.
• A green (or green and yellow) cable typically indicate that it is a ground
cable.
Caution DC PEMs contains circuitry to trip the breaker on the PEM if the PEM 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 and the cable lugs used to attach the cables to
the router chassis are not available from Cisco Systems. They are available from
any commercial cable vendor. For more information on site power and source DC
cable requirements, see the
“Power Connection Guidelines” section on page 2-13 .
Warning To ensure that power remains off while you are performing this procedure, tape
the DC circuit breaker switch in the off (0) position.