Cisco Systems manual Fan Tray and Blower Assembly Overview, 30 7500 Series Chassis Interface

Chapter 1 Cisco 7500 Series Product Overview

Fan Tray and Blower Assembly Overview

Figure 1-30 7500 Series Chassis Interface

Standoff screw holes

Chassis interface

Standoff screw holes

H2877

The CI isolates the CPU and system software from chassis-specific variations, and is attached directly to the front (noninterface processor side) of the system backplane.

The functions of the CI are as follows:

•Report backplane type and arbiter type

•Monitor power supply and fan and blower status

•Monitor the temperature sensors on the RSP

•Provide router power up/down control and power supply power-down control

Note In the Cisco 7513 and Cisco 7513-MX, a hard shutdown is achieved by disabling the power source. In the Cisco 7576, both routers share the same power source. In the Cisco 7576, when one router senses a problem requiring a hard shutdown, the RSP and all interface processors installed in that router (only) are powered off. In the first 14 temperature cycles, the RSP and interface processors are powered back on once the temperature of the system falls below a certain temperature setpoint. At the fifteenth temperature cycle, this temperature setpoint is changed to a very low value, preventing the affected router from powering back up.

This achieves a hard shutdown of one router without affecting the other router. The RSP and interface processors will remain disabled until the power is manually recycled. This allows you to choose a suitable time to recycle the power when it will not adversely affect your users.

For CI maintenance information, see “Removing and Replacing the Chassis Interface in the Cisco 7505” section on page 5-11,“Removing and Replacing the Chassis Interface in the Cisco 7507 and Cisco 7507-MX” section on page 6-12, and “Removing and Replacing the Chassis Interface in the Cisco 7513, Cisco 7513-MX, and Cisco 7576” section on page 7-14. (For all Cisco 7500 series routers, a spare CI ships as Product Number MAS-7500CI=.)

Fan Tray and Blower Assembly Overview

Blower and fan tray assemblies cool the interior of the Cisco 7505 router chassis. It may be difficult to determine whether or not the fans or blowers are operating in noisy, air-conditioned rooms. If you determine that they are not operating, contact a customer service representative immediately. There are no installation adjustments that you should make if the fan or blower assembly does not function properly at initial startup.

	Cisco 7500 Series Installation and Configuration Guide
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