M40E Midplane Description; Chapter 2 M40E Hardware Components - Juniper M40E Hardware Manual

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M40e Midplane Description

Copyright © 2010, Juniper Networks, Inc.
All manuals and user guides at all-guides.com
CAUTION: Before removing or installing components of a router, attach an
ESD strap to an ESD point and place the other end of the strap around your
bare wrist. Failure to use an ESD strap can result in damage to the router.
WARNING: The router must be connected to earth ground during normal
operation.
For further safety information, see "General Safety Guidelines and Warnings
for M Series, MX Series, and T Series Routers" on page 229.
M40e Router Physical Specifications on page 269
Installing the M40e Chassis into the Rack on page 95
M40e Chassis Lifting Guidelines on page 235
The midplane is a panel located in the center of the chassis, running from side to side
and forming the rear of the FPC card cage (see Figure 4 on page 12). All router components
other than PICs plug directly into the midplane. The midplane contains an EEPROM that
stores the serial number and revision level of the midplane.
The midplane performs the functions:
Transfer of packets—The midplane accepts an incoming packet after it is processed
by an FPC, and transmits it to an SFM. The SFM performs switching and forwarding
functions and transfers outgoing packets back across the midplane to the FPCs for
transmission to the network.
Power distribution—The midplane distributes power to all router components from
the power supplies attached to it.
Signal connectivity—The midplane transports the signals exchanged by system
components for monitoring and control purposes.
Chapter 2: M40e Hardware Components
11