1
Doc. No.
Copyright © 1996
Cisco Systems, Inc.
All rights reserved.
Replacing the Chassis Interface (CI) Board
in the Cisco 7500 Series Chassis
78-1810-02
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:
•
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
Warning
Before working on a system that has an on/off switch, turn OFF the power and unplug
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.
