Figure 10: Midplane - Juniper T4000 Hardware Manual

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chassis, and the SIBs, Routing Engines, and control boards and SCGs 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,

CB, and other system components for monitoring and control of the system.

Figure 10: Midplane

FPC card cage

Chapter 3: Chassis Components and Description