Maintenance Bus - Cisco 12404 Installation And Configuration Manual

Chapter 1 Product Overview

Maintenance Bus

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Figure 1-16 Chassis Cable Management Bracket
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The Cisco 12404 Internet router maintenance bus and MBus modules manage all
of the maintenance functions of the system.
The MBus consists of two separate busses (providing MBus redundancy). Each
MBus is linked to all of the following.
Line cards
•
Route Processor
•
• CSF card
The MBus module located on each component, communicates over the MBus and
is powered by +5 VDC directly from the fabric card. The MBus performs the
functions of power-on/off control for each component, component (device)
discovery, code download, diagnostics, and environmental monitoring and
alarms.
Cisco 12404 Internet Router Installation and Configuration Guide
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Maintenance Bus

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