Cisco Systems XR 12406 manual Power-on and Power-off Control, Device Discovery, Code Download

Chapter 1 Cisco XR 12406 Router Overview

Line Cards

Power-on and Power-off Control

Each MBus module directly controls the DC-DC converters on the component on which it is mounted, based on commands the component receives from its on-board EPROM and from the route processor. Each MBus module is tied directly to DC voltage from the alarm card.

When power is applied to the router, all MBus modules immediately power on. The MBus modules on the route processor and CSC immediately turn on the DC-DC converter, powering up the respective card. The line card MBus module waits to power on the line card until it receives a command from the route processor.

Device Discovery

The route processor uses the MBus to detect the system configuration. The route processor sends a message over the MBus requesting identity information from all installed devices. The responses provide component type, as well as slot numbers for the line cards, CSCs, SFCs, and alarm cards.

Code Download

A portion of the line card operating software can be downloaded from the route processor to the line card over the MBus. Because the MBus is relatively slow compared to the switch fabric, only enough code is downloaded to the line card for it to access the switch fabric and complete the download process.

Diagnostics

The diagnostic software image is downloaded from the route processor to the line card during the test sequence.

	Cisco XR 12406 Router Installation Guide
OL-13831-01		1-27