Mx2008 Backplane Description - Juniper MX2008 Hardware Manual

Universal routing platform

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MX2008 Backplane Description

The MX2008 router consist of a signal backplane and a power backplane that connect PSMs and PDMs

to the chassis. The adapter cards are carrier cards used to house the MPCs. The MPCs install into the

bottom card-cage signal backplanes from the front of the chassis and mate to the signal backplane to

connect to the Enhanced Switch Fabric Boards (SFB2s) and the Routing and Control Boards (RCBs). The

backplane connects 10 line cards to 8 SFBs and 2 RCBs. The SFBs and RCBs are installed at the top of the

chassis from the front. The cooling system components also connect to the signal backplane. The PSMs

install into the power backplane, and the PDMs mate to the power backplane.

The backplanes performs the following major functions:

Data path—Data packets are transferred across the signal backplane between the MPCs through the

fabric ASICs on the SFBs.

Power distribution—The router PDMs relay power from the feeds to the input of the PSMs through the

power backplane. In addition, the output power from PSMs is distributed to the components of the

chassis (MPCs, SFBs, and RCBs), using the power backplane.

Control/management path—The backplanes provides management and control path connectivity among

the various system components.