Figure 3: Rear View of a Fully Configured DC-Powered M120 Router Chassis
For chassis serial number information , see “Displaying M120 Router Components and
Serial Numbers” on page 297.
Related
Documentation
M120 Router Physical Specifications on page 82•
• General Safety Warnings for Juniper Networks Devices on page 314
• General Safety Guidelines for Juniper Networks Devices on page 313
• M120 Chassis Lifting Guidelines on page 321
M120 Midplane Description
The midplane is located in the center of the chassis and forms the rear of the FPC card
cage (see Figure 4 on page 10). The FPCs install into the midplane from the front of the
chassis, and the FEBs, Routing Engines, power supplies, 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 between an FPC and
its associated FEB, and between the FEBs via the fabric ASICs on the CB.
9Copyright © 2018, Juniper Networks, Inc.
Chapter 3: Chassis Components and Descriptions
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