M10i Router Components

Table 5 lists the major M10i router components and characteristics.

Table 5: M10i Router Major Hardware Components                    

Component	Quantity	Function	Redundant	Field- Replaceable	Offline Button
CFEB	1 or 2	Provides route lookup, filtering, and switching on incoming data packets; directs outbound packets to the appropriate FPC for transmission to the network	Yes	Hot-pluggable	Yes
Cooling system	2 fan trays (8 fans)	Cools router components	Yes	Hot-removable, hot-insertable	-
FPC	2	House the PICs that connect the router to network media	-	Built-in	-
HCM	2	Works with a companion Routing Engine to provide control and monitoring functions for router components; displays alarm status; takes PICs online and offline		Hot-pluggable	-
PIC	1-8	Provides interfaces to various network media; receives incoming packets from the network and transmits outgoing packets to the network, performing framing and line-speed signaling for their media type; encapsulates outgoing packets received from the FPCs before transmitting them.	-	Hot-removable, hot-insertable	Yes (On the HCM)
Power supply	1-4 AC or DC	Distributes needed voltages to components	Yes	Hot-removable, hot-insertable	Yes
SFP		Fiber-optic transceivers that connect to PICs	-	Hot-removable, hot-insertable	-
Routing Engine	1 or 2	Runs the JUNOS software; 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	Yes	Hot-pluggable	Yes

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.