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Figure 2
Cisco 12012 DC-Input Power Supply
Source DC terminals
Circuit breaker
alarm terminal
block
Handle
Power switch
Captive jackscrew
DC power
cable bracket
Electrical and control line connections between the power supply and the Cisco 12012 backplane are
made through a connector located at the back of the power supply. A three-lead terminal block
mounted on the power supply faceplate provides connection points for an external circuit breaker
alarm circuit. The source DC power cable attaches to the power supply through three pairs of
threaded terminals (negative (–), positive (+), and ground) located on the power supply faceplate.
Table 1 lists the DC-input power supply power specifications.
Table 1
DC-Input Power Supply Power Specifications
Specification
Nominal Value
DC input voltage
–48/–60 VDC
Source DC service
60amp (A)
requirement
DC output voltages
+5.2 and –48 VDC
1. VDC = volts direct current.
Cisco 12012 Gigabit Switch Router DC-Input Power Supply Replacement Instructions
Input OK LED
Output fail LED
Acceptable Value Ranges
1
–40.5 to –56 VDC (United States)
–58 to –75 VDC (International)
–
+5.35 to +5.0 VDC
–75 to –40.5 VDC
Product Overview
3