Cisco Gigabit Switch Router 12008 Installation And Configuration Manual page 306

Adding, Removing, or Replacing a DC-Input Power Supply
7-26
Cisco 12008 Gigabit Switch Router Installation and Configuration Guide
Note The circuit breaker alarm terminal block enables you to attach an external
monitoring facility to the power supply to detect when the power supply circuit
breaker trips during an electrical event, such as an overvoltage condition in the
power supply.
The functions and uses of the circuit breaker alarm terminal block are described
in detail in the subsection entitled "Circuit Breaker Alarm Terminal Block" in
Chapter 1.