Table 6: M20 Router Major Hardware Components - Juniper M Series Monitoring And Troubleshooting Manual

M Series and T Series Routers Monitoring and Troubleshooting Guide

Table 6: M20 Router Major Hardware Components

Component
Cooling system
Craft interface
FPC
PIC
Power supply
Routing Engine
SSB
Related
Documentation
12
Quantity Function
3 fan Cools router components
trays and
1 rear
Routing
Engine
fan
1 Displays the status and allows you to
perform control functions
1–4 Connects PICs to other components and
houses shared memory
1–4 per Provides interfaces to various network
FPC media
2 AC or 2 Distributes needed voltages to
DC components
1–2 Handles routing protocols and maintains
routing tables
1–2 Performs router lookups, manages shared
memory, and transfers control packets
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.
M20 Internet Router Overview on page 10
Field-
Redundant Replaceable
Yes Hot-removable,
hot-insertable
– Hot-removable,
hot-insertable
– Hot-removable,
hot-insertable
– Hot-removable,
hot-insertable
Yes Hot-removable,
hot-insertable
Yes Hot-pluggable
Yes Hot-pluggable
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Yes
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Yes
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