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Field-Replaceable Units (FRUs)

Field-replaceable units (FRUs) are router components that can be replaced at the customer site. Replacing most FRUs requires minimal router downtime. The router uses the following types of FRUs:

Hot-removable and hot-insertable FRUs—You can remove and replace these components without powering down the router or disrupting the routing functions.
Hot-pluggable FRUs—You can remove and replace these components without powering down the router, but the routing functions of the system are interrupted when the component is removed.

Table 4 lists the FRUs for the M160 router.

Table 4: Field-Replaceable Units

Hot-Removable and Hot-Insertable FRUs	Hot-Pluggable FRUs	FRUs That Require Powering Down the Router
Air filter Fan tray (located behind the cable management system) Flexible PIC Concentrator (FPC) Physical Interface Card (PIC) Power supply Small form factor pluggable (SFP)	Miscellaneous Control Subsystem (MCS) Packet Forwarding Engine Clock Generator (PCG) Routing Engine Switching and Forwarding Module (SFM)	Circuit breaker box Connector Interface Panel (CIP)

Hot-Removable and Hot-Insertable FRUs

Hot-Pluggable FRUs

FRUs That Require Powering Down the Router

Air filter

Fan tray (located behind the cable management system)

Flexible PIC Concentrator (FPC)

Physical Interface Card (PIC)

Power supply

Small form factor pluggable (SFP)

Miscellaneous Control Subsystem (MCS)

Packet Forwarding Engine Clock Generator (PCG)

Routing Engine

Switching and Forwarding Module (SFM)

Circuit breaker box

Connector Interface Panel (CIP)

For FRU replacement instructions, see Replacing Hardware Components.

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