M120 Multiservice Edge Router Overview; Figure 7: Front View Of An M120 Router - Juniper M Series Monitoring And Troubleshooting Manual

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M120 Multiservice Edge Router Overview

Field-replaceable units (FRUs) are router components that can be replaced at the

customer site. Replacing FRUs requires minimal router downtime. There are three types

Hot-removable and hot-insertable—You can remove and replace the component

without powering down the router or interrupting the routing functions.

Hot-pluggable—You can remove the component without powering down the router,

but routing functions are interrupted until the replacement is installed.

Requires router shutdown—You must power down the router before removing the

M40e Multiservice Edge Router Overview on page 15

The M120 Multiservice Edge Router is a complete routing system that provides

SONET/SDH, ATM, Ethernet, and channelized interfaces for large networks and network

applications, such as those supported by Internet service providers (ISPs) and large

enterprise customers. Application-specific integrated circuits (ASICs), a definitive part

of the router design, enable the router to forward data at the high speeds demanded by

current network media. (See

Chapter 1: M Series Multiservice Edge Routers

Figure 7 on page