Figure 5: Fpc And Cfpcs Installed In An M120 Router Chassis - Juniper Networks Hardware Manual

M120 Multiservice Edge Router Hardware Guide
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Each FPC contains a translator, a crossbar connection to the FEBs, power subsystem,
and the physical PIC connectors. The assembly contains a translation component that
converts between the midplane signals and the signals required by the types of supported
PICs. The translator fully terminates the PIC side connection, providing local flow control,
buffering, and electrical conversion.
The FPCs interface with the following router system components: the PEMs, CBs, FEBs,
and PICs.
The FPC slots on the router allow four PICs in Type 1 or Type 2 FPCs and one PIC in a
Type 3 FPC to share power circuits and a CPU. Up to four FPCs install vertically in the
front of the router (see Figure 5 on page 10). The FPC slots are numbered left to right
from to . Depending on the FPC type, an FPC has either one or four slots into
FPC2 FPC5
which a PIC can be installed. An FPC can be installed into any FPC slot on the router,
regardless of which PICs it contains.
If a slot is not occupied by an FPC, an FPC blank panel must be installed to shield the
empty slot and to allow cooling air to circulate properly through the router.
FPCs are hot-removable and hot-insertable, as described in "M120 Field-Replaceable
Units (FRUs)" on page 127. When you install an FPC into a functioning router, the Routing
Engine downloads the FPC software, the FPC runs its diagnostics, and the PICs housed
on the FPC, are enabled. Forwarding on other FPC slots continues uninterrupted during
this process.

Figure 5: FPC and CFPCs Installed in an M120 Router Chassis

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