Cisco Systems Cisco 12008 manual System Specifications

System Specifications

The MBus modules on other installed components then power up on command from the master MBus agent on the GRP.

•Device discovery—The GRP determines the system configuration by means of the MBus facility.

A message is sent from the master GRP MBus agent, requesting that all installed components identify themselves. Each return response includes slot number, card type, and component type.

•Downloading software—A line card ROM monitor is loaded into Flash ROM on the card during the manufacturing process. This image, which can be field upgraded, if necessary, boots software to the line card by means of the MBus facility.

Because the MBus is slow relative to the switch fabric, only enough code is initially downloaded to the line card to enable it to access the router’s switch fabric.

This initial code includes a line card fabric downloader that functions as a secondary bootstrap program to quickly complete the downloading of the Cisco IOS image to the line card by means of the router’s high-speed switch fabric.

•Diagnostics—The MBus facility enables field diagnostics to be run on the GRP and the line cards, whether the router is in service (running diagnostics on an individual card without taking the router offline) or out of service (taking the entire router down to run diagnostics).

•Environmental monitoring and alarm functions—The environmental monitoring functions of the MBus system include the following:

—Voltage and temperature monitoring for the router’s installed components

—Fan failure sensing for the card cage fan tray and the power supply fan tray

System Specifications

Table 1-8 lists the physical specifications of the Cisco 12008.

Table 1-9 outlines the electrical specifications of the AC-input power supply; Table 1-10 outlines similar specifications for the DC-input power supply.

Table 1-11 lists the environmental specifications of the Cisco 12008.

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