Figure 4: Midplane - Juniper M320 Hardware Manual

M320 Router Hardware Guide
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chassis, and the SIBs, Routing Engines, and CBs 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 4: Midplane

For chassis serial number information , see "Locating M320 Component Serial Numbers
Using the CLI" on page 273.
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