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
of FRUs:
•
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
component.
Related
Documentation
M40e Multiservice Edge Router Overview on page 15•
M120 Multiservice Edge Router Overview
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 Figure 7 on page 17.)
Figure 7: Front View of an M120 Router
17Copyright © 2012, Juniper Networks, Inc.
Chapter 1: M Series Multiservice Edge Routers
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