Figure 6: T640 Midplane - Juniper T640 Hardware Manual

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T640 Core Router Hardware Guide

install into the midplane from the rear of the chassis. The power supplies and cooling

system components also connect to the midplane.

The midplane performs the following major functions:

Data path—Data packets are transferred across the midplane from the Packet

Forwarding Engine on the originating FPC to the SIBs, and from the SIBs across the

midplane to the Packet Forwarding Engine on the destination FPC.

Power distribution—The router power supplies are connected to the midplane, which

distributes power to all the router components.

Signal path—The midplane provides the signal path to the FPCs, SIBs, Routing Engines,

and control boards, and other system components for monitoring and control of the

Figure 6: T640 Midplane

FPC card cage

For chassis serial number information , see

Using the CLI" on page

"Locating T640 Component Serial Numbers