Cisco GSR12/60 - 12012 Router -AnyLAN, SONET/SDH Installation And Configuration Manual page 156

Connecting Power
Caution
servicing the source DC power cable you are attaching to the DC-input power supply is in
the OFF position. Also verify that the power switch on the DC-input power supply is OFF
(O). As an additional check, measure the voltages across the DC power cable leads you
intend to attach to the power supply. All readings should be zero volts.
Step 6
Warning
disconnected last.
Step 7
3-60 Cisco 12012 Gigabit Switch Router Installation and Configuration Guide
Before proceeding to the next step, verify that the source DC circuit breaker
Thread the source DC power cable leads up underneath the power supply handle.
Allow sufficient slack in the power cable for strain relief.
The color coding of the source DC power cable leads to the DC-input
Note
power supply depends on the color coding of the site DC power source.
Typically, green or green/yellow is used for ground. Since there is no color code
standard for the DC wiring, you must ensure that the proper polarity is connected
to the DC-input power supply. In some cases, the source DC cables might have
a (+) or a (–) label. This is a relatively safe indication of the cable polarity.
When installing the unit, the ground connection must always be made first and
Remove the nut and locking washer from each of the six power supply threaded
terminals on the front of the power supply. Attach the source DC power cable
lug to the power supply terminal in the following order (see Figure 3-29):
•
Ground to ground
•
Positive (+) to positive (+)
•
Negative (–) to negative (–).