M5 and M10 Router Components

Table 5 lists the major M5 and M10 router components and characteristics.

Table 5: M5 and M10 Router Major Hardware Components                    

Component	Quantity	Function	Redundant	Field- Replaceable	Offline Button
Cooling system	1 fan tray (3 fans)	Cools router components	Yes	Hot-removable, hot-insertable	-
Craft interface	1	Displays the status and allows you to perform control functions	-	-	-
FEB	1	Connects PICs to other components and houses shared memory	-	Requires router shutdown	-
PIC	1-4 M5 routers 1-8 M10 routers	Provides interfaces to various network media	-	Hot-removable, hot-insertable	Yes
Power supply	2 AC or 2 DC	Distributes needed voltages to components	Yes	Hot-removable, hot-insertable	-
Routing Engine	1	Handles routing protocols and maintains routing tables	-	Requires router shutdown	-

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.