Table 9: M120 Router Major Hardware Components (continued)
Offline
Button
Field-
replaceableRedundantFunctionQuantityComponent
–Hot-removable,
hot-insertable
YesCools router components2 front
fan trays,
2 rear fan
trays (4
fans)
Front air
filter
Cooling system
–Hot-removable,
hot-insertable
–Displays status and allows you to perform
control functions
1Craft interface
YesHot-removable,
hot-insertable
–Connect PICs to other components and
houses shared memory
1–4FPCs
Hot-removable,
hot-insertable
Combination of a PIC and an FPC; contains
the interface circuitry and the FPC as a
single assembly
1–2CFPC
YesHot-removable,
hot-insertable
–Provide interfaces to various network
media; receive incoming packets from the
network and transmit outgoing packets to
the network, performing framing and
line-speed signaling for their media type;
encapsulate outgoing packets received by
the FPCs before transmitting them
1–4 per
FPC
PICs
–Hot-removable,
hot-insertable
YesDistributes needed voltages to
components
2 AC or 2
DC
Power supply
–Hot-pluggableYesRuns Junos OS ; maintains the routing
tables, manages the routing protocols
used on the router, controls the router’s
interfaces, controls some chassis
components, and provides the interface
for system management and user access
to the router
1–2Routing Engine
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.
Copyright © 2012, Juniper Networks, Inc.20
M Series and T Series Routers Monitoring and Troubleshooting Guide
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