Hardware Component Overview
FPC Types
The router supports two types of FPC, shown in Figure6:
FPC1 (standard or enhanced)—Supports PICs including single-port
OC-12/STM-4 and Gigabit Ethernet.
FPC2 (standard or enhanced)—Supports higher-speedPICs including
OC-48/STM-16 and Tunnelservices.
You can install any combination of FPC types together on the router.
FPCs are hot-removableand hot-insertable, as described in Field-Replaceable Units
(FRUs) on page 4. When you remove or install an FPC, packet forwardinghalts
forabout200mswhilethePacketForwardingEngineadjuststothechangein
the amount of memory available in the pool located on and sharedby all FPCs.
When you install an FPC intoa functioning router, the Routing Engine downloads
the FPC software,the FPC runs its diagnostics, and the PICs housed on the FPC
are enabled. Forwarding continuesuninterrupted during this process. For FPC
replacement instructions,see “Replacing an FPC” on page 169.
Enhanced FPCs have I/O Manager ASICs capable of enhancedquality of
service, and 2 MB of SSRAM.Enhanced FPCs can be identified through
theCLI,orbyastickeronthefaceplate.
The PICs that installon bothtypes of FPC are also hot-removable and hot-insertable.
For more information,see “Physical Interface Cards (PICs)” on page 13.
Packet Forwarding Engine 17