Replacing the Chassis Interface (CI) Board
in the Cisco 7500 Series Chassis
Product Number: MAS-7500CI=
This document contains instructions for replacing the chassis interface (CI) board in the Cisco 7500
series routers: Cisco 7505, Cisco 7507, and Cisco 7513. The CI mounts directly to the front side of
the backplane inside each chassis and provides the environmental monitoring (ENVM) and power
supply monitoring functions for the Cisco 7500 series routers. The CI isolates the CPU and system
software from chassis-speciﬁc variations. The CI attaches directly to the system backplane and is
considered to be a ﬁeld-replaceable unit (FRU).
Following are the functions of the CI:
the power cord. (For a translation of this safety warning, refer to the section "Translated Safety
Warnings" on page 32.)
To prevent injury, you must turn off all system power before opening the chassis to access the CI.
The system backplane, which is exposed when the front panels are removed, carries dangerous
current levels. Opening the chassis exposes the power distribution wiring on the backplane. If the
power is not shut down, the high current present on the backplane becomes a hazard. Also, removing
the cover compromises the electromagnetic interference (EMI) integrity of the system. Before
opening the chassis, read the section "Safety Guidelines" on page 2.
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Cisco Systems, Inc.
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Reports backplane type
Reports arbiter type
Monitors power supply status
Monitors fan/blower status
Monitors temperature sensors on the RSP1
Provides router power up/down control
Provides power supply power-down control
Provides temperature output for fan speed control
Monitors power supply currents
Before working on a system that has an on/off switch, turn OFF the power and unplug