M120 Forwarding Engine Boards (Febs) Overview; M120 Forwarding Engine Boards (Febs) Description; Feb Components; Figure 9: M120 Feb - Juniper Networks Hardware Manual

M120 Multiservice Edge Router Hardware Guide

M120 Forwarding Engine Boards (FEBs) Overview

M120 Forwarding Engine Boards (FEBs) Description

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M120 Forwarding Engine Boards (FEBs) Description on page 16
M120 Forwarding Engine Boards (FEBs) LEDs on page 17
The M120 router provides redundant Forwarding Engine Boards (FEBs). The FPC (the
board that hosts the PICs) is separate from the FEB (the board that handles the packets).
FEBs provide route lookup and forwarding functions from FPCs and CFPCs. FPCs and
CFPCs are located on the front of the chassis, and provide power and management to
the PICs through the midplane. The midplane relays signals to the FEB (inserted from
the rear of the chassis, which processes the packets.
The midplane architecture allows any FEB to carry traffic for any FPC. You can configure
the mapping of FPCs to FEBs. If a FEB fails, a backup FEB can quickly take over packet
forwarding.

Figure 9: M120 FEB

FEB Components

Each FEB consists of the following components:
I-chip ASIC, which provides multiple paths for PFE to PIC communication.
H2S—Bridge between HSLA and one SPI4 interface.
A crossbar switch that provides connection between the FEB WAN links and the FPC
WAN links.
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