Regular PICs are housed in the FPCs installed in the front of the router, as shown in Figure 1.
A regular PIC is hot-removable and hot-insertable in the sense that its absence does not disrupt routing functions; however, you must completely remove its host FPC from the chassis before removing the PIC, which affects all PICs on the FPC.
Quad-wide PICs, such as the 4-port Gigabit Ethernet and OC48/STM16 SONET/SDH PICs, occupy an entire FPC slot and are hot-removable and hot-insertable, as described in Field-Replaceable Units (FRUs). The instructions for replacing a quad-wide PIC are the same as for an FPC. See Replacing an FPC.
To replace a regular PIC, perform the following procedures: