Juniper M Series Monitoring And Troubleshooting Manual page 64

M Series and T Series Routers Monitoring and Troubleshooting Guide
Table 9: M120 Router Major Hardware Components (continued)
Component
Cooling system
Craft interface
FPCs
CFPC
PICs
Power supply
Routing Engine
20
Quantity Function
2 front Cools router components
fan trays,
2 rear fan
trays (4
fans)
Front air
filter
1 Displays status and allows you to perform
control functions
1–4 Connect PICs to other components and
houses shared memory
1–2 Combination of a PIC and an FPC; contains
the interface circuitry and the FPC as a
single assembly
1–4 per Provide interfaces to various network
FPC 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
2 AC or 2 Distributes needed voltages to
DC components
1–2 Runs 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
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.
Field-
Redundant replaceable
Yes Hot-removable,
hot-insertable
– Hot-removable,
hot-insertable
– Hot-removable,
hot-insertable
Hot-removable,
hot-insertable
– Hot-removable,
hot-insertable
Yes Hot-removable,
hot-insertable
Yes Hot-pluggable
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