Cisco GSR12/60 - 12012 Router -AnyLAN, SONET/SDH Installation And Configuration Manual page 59

The DC-input power supply has the following features (see Figure 1-9):
•
Operates from a DC source voltage of –40.5 to –75 VDC and requires a dedicated 60A
service.
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A handle. Provides a grip point for removing and replacing the power supply.
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A captive jackscrew. Seats and unseats the power supply in the backplane power supply
connector and secures the power supply to the power supply bay.
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A power switch. Turns the power supply on and off and controls a latch that secures the
power supply in the power supply bay. Turning the power switch on (|) engages the
latch; turning the power switch off (O) releases the latch.
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Two LEDs on the power supply faceplate. The LEDs indicate the following:
— A green input OK LED indicates that the source DC voltage is within the
operational range of –40.5 to –75 VDC. The LED is on anytime the power supply
is connected to source DC and the power supply power switch is on.
— A red output fail LED indicates that one or both of the power supply output voltages
(+5 and –48 VDC) is out of tolerance. The LED will flash on and off for five
seconds as a test of the LED when the power supply is first turned on.
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Six threaded terminals—two each for negative (source DC), positive (source DC
return), and ground. A hardwired source DC power cable is required from the site DC
power source to the DC-input power supply. The DC power cable leads should be 4
American Wiring Gauge (AWG) high strand count wire. The lugs for connecting power
cable leads to the power supply should be dual-hole, M6 terminal lugs with .625-inch
(15.86-mm) centers.
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An external circuit breaker alarm. Indicates when a DC-input power supply circuit
breaker has tripped. A terminal block with three connectors is mounted on the left side
of the power supply for this external alarm.
Physical and Functional Overviews
Product Overview 1-31