M160 Router Major Hardware Components

Table 9 lists the major M160 router components and characteristics.

Table 9: M160 Router Major Hardware Components                    

Component	Quantity	Function	Redundant	Field- replaceable	Offline Button
CIP	1	Provides ports for external management, BITS interfaces, and alarm relay devices	-	Requires router shutdown	-
Cooling system	3 impellers and 1 fan tray (4 fans)	Cools router components	Yes	Hot-removable	-
Craft interface	1	Displays status and allows you to perform control functions	-	Hot-removable, hot-insertable	-
FPC	1-8	Connects PICs to other components and houses shared memory	-	Hot-removable, hot-insertable	Yes
Host module	1-2	Handles routing protocols and maintains routing tables	Yes	Hot-pluggable	-
MCS	1-2	Provides system control and monitoring	Yes	Hot-pluggable	Yes
PCG	2	Provides a 125-MHz system clock	Yes	Hot-pluggable	Yes
PICs	1-4 per FPC	Provides interfaces to various network media	-	Hot-removable, hot-insertable	Yes
Power supply (DC only)	2	Distributes needed voltages to components	Yes	Hot-removable, hot-insertable	-
Routing Engine	1-2	Manages routing protocols and maintains routing tables	Yes	Hot-pluggable	-
SFM	1-4	Provides packet switching, packet forwarding, and route lookup	Yes	Hot-removable, hot-insertable	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.