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Cisco 12404 Internet Router Installation and Configuration Guide
OL-11636-01
Chapter 1 Product Overview
Maintenance Bus
Figure 1-16
Chassis Cable Management Bracket
Maintenance Bus
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.
CONSOLID
ATED SWITCH F
ABRIC
CRITICAL
MA
JORMIN
OR
MBUS
FAIL
ENABLE
ALARM F
ABRIC
1
0
2
3
40C48/PO
S-SR-SC
TX
RX
ACTIVE
CARRIER
RX PKT
CLASS 1 LASER PR
ODUCT
LASERPRODUKT DER
KLASSE 1
PRODUIT LASER DE C
LASSE 1
PRODUCTO LASER DE CLASSE 1
CLEAN
CONNECT
OR
WITH ALCO
HOL
WIPES BEFO
RE
CONNECTIN
G
SLO
T-0
GIGABIT R
OUTE PR
OCESSOR
SLO
T-1
COLL
LINK
TX
RX
RJ-45
MII
RESET
AU
X
EJECT
CO
NS
OL
E
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todd.book Page 31 Tuesday, November 27, 2007 6:02 PM