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Flexible PIC Concentrators (FPCs) house the PICs that connect the router to network media (for information about PICs, see Physical Interface Cards (PICs)). Up to eight FPCs install vertically into the backplane from the front of the chassis.

Physical Interface Cards (PICs) physically connect the router to network media. They are housed in Flexible PIC Concentrators (FPCs); for more information about FPCs, see Flexible PIC Concentrators (FPCs). (Quad-wide PICs, such as the 4-port Gigabit Ethernet and OC48/STM16 SONET/SDH PICs, are an exception. Such PICs occupy an entire FPC slot in the chassis and insert directly into the slot rather than into an FPC card carrier.)