Juniper M Series User Manual

Table 6: M20 Router Major Hardware Components
Offline
Button
Field-
ReplaceableRedundantFunctionQuantityComponent
–Hot-removable,
hot-insertable
YesCools router components3 fan
trays and
1 rear
Routing
Engine
fan
Cooling system
–Hot-removable,
hot-insertable
–Displays the status and allows you to
perform control functions
1Craft interface
YesHot-removable,
hot-insertable
–Connects PICs to other components and
houses shared memory
1–4FPC
–Hot-removable,
hot-insertable
–Provides interfaces to various network
media
1–4 per
FPC
PIC
–Hot-removable,
hot-insertable
YesDistributes needed voltages to
components
2 AC or 2
DC
Power supply
YesHot-pluggableYesHandles routing protocols and maintains
routing tables
1–2Routing Engine
–Hot-pluggableYesPerforms router lookups, manages shared
memory, and transfers control packets
1–2SSB
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
M20 Internet Router Overview on page 10•
Copyright © 2012, Juniper Networks, Inc.12
M Series and T Series Routers Monitoring and Troubleshooting Guide

Juniper M Series Specifications

General

Brand	Juniper
Model	M Series
Category	Network Router
Language	English