Mx2020 Rack-Mounting Hardware; Mx2020 Backplane Description - Juniper MX2020 Hardware Manual

MX2020 Rack-Mounting Hardware

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MX2020 Backplane Description

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Copyright © 2013, Juniper Networks, Inc.
The rack-mounting hardware for the MX2020 router includes:
The large adjustable mounting shelf for mounting in four-post racks or cabinets
Front-mounting flanges on the front of the chassis for front-mounting in a four-post
rack or cabinet
Mounting screws
NOTE: There must be a minimum of 45U of usable rack space when installing
the MX2020 router into a 45U rack.
MX2020 Chassis Description on page 12
MX2020 Backplane Description on page 19
Installing the MX2020 Mounting Hardware for a Four-Post Rack or Cabinet on page 81
Backplanes are located toward the rear of the chassis and form the rear of the card cage.
They consist of one upper signal and power backplane located at the top of the chassis,
and one lower signal and power backplane located at the bottom of the chassis. The
Switch Fabric Boards (SFBs) connect both upper and lower backplanes. The adapter
cards (ADCs) are carrier cards used to house the MPCs. The MPCs install into the top
and bottom card cage backplanes from the front of the chassis and mate to the signal
backplanes. The SFBs and CB-REs install into the middle from the front of the chassis.
The PSMs, and PDMs install into the top and bottom power backplanes from the rear of
the chassis. The cooling system components also connect to the top and bottom
backplanes.
The backplane performs the following major functions:
Data path—Data packets are transferred across the 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 midplane. In addition, the output power from PSMs is
distributed to the components of the chassis (MPCs, SFBs, and CB-REs), using the
power backplane.
Control/Management path—The backplane provides management and control path
connectivity among the various system components.
MX2020 Router Overview on page 3
MX2020 Chassis Description on page 12
Chapter 2: MX2020 Hardware Components
19