• Downloads
• M120 Flexible PIC Concentrators (FPCs) Description    

• Related Topics
• Maintaining M120 FPCs and CFPCs
• M120 FPC Terminology
• Troubleshooting M120 FPCs and CFPCs
• Replacing an M120 FPC

M120 Flexible PIC Concentrators (FPCs) Description

The Flexible PIC Concentrators (FPCs) provide the infrastructure to power and control PICs and to translate packets to and from each PIC into a standard interface that the FEB processes.

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 1). The FPC slots are numbered left to right from FPC2 to FPC5. Depending on the FPC type, an FPC has either one or four slots into which a PIC can be installed (see FPCs Supported by the M120 Router for more information). 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.

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.

FPCs are hot-removable and hot-insertable, as described in M120 Field-Replaceable Units (FRUs). 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. For FPC replacement instructions, see Replacing an M120 FPC.

Figure 1: FPC and CFPCs Installed in an M120 Router Chassis

FPCs Supported by the M120 Router

The M120 router supports the following types of FPCs:

• FPC1—Rated at 4 gigabits per second (Gbps) full duplex; supports up to four PICs
• FPC2—Rated at 10 Gbps full duplex; supports up to four PICs
• FPC3—Rated at 10 Gbps full duplex; supports one PIC, including higher-speed PICs

You can install any combination of these FPC types in the M120 router.

The M120 router supports the FPCs listed in Table 1.

Table 1: FPCs Supported by the M120 Router

FPC Type	FPC Name	FPC Model Number	Maximum Number of PICs Supported per FPC	Maximum Throughput per FPC	First JUNOS Release
1	FPC1	M120-FPC1	4	4 Gbps	8.0R2
2	FPC2	M120-FPC2	4	10 Gbps	8.0R2
3	FPC3	M120-FPC3	1	10 Gbps	8.0R2

Faceplates on FPCs for the M120 router are labeled with the FPC type (FPC1, FPC2, or FPC3). The faceplates on the CFPCs are labeled with their CFPC type, Ethernet 10GBASE XFP or OC192.

Figure 2 shows the three types of FPCs that the M120 router supports.

Figure 2: FPC1, FPC2, and FPC3 for the M120 Router

FPC Components

Each FPC consists of the following components:

• FPC card carrier, which includes the PIC slots.
• HSL2 conversion FPGA, a bridge between the HSL2 interface and the interface required by the types of supported PICs (either BD8, BD32 or HSL1).
• HSL2 crossbar connection to the FEBs.
• PIC CPU complex.
• Physical PIC connectors.
• Midplane connectors and power circuitry.
• Processor subsystem, which includes a 667-MHz CPU, system controller, 128 MB of SDRAM, and two Fast Ethernet links to the Control Board.
• An LED, located on the craft interface above the FPC, that displays the status of the FPC. For more information on the FPC LEDs, see FPC LEDs on the M120 Craft Interface.
• FPC online/offline button, located on the craft interface above the FPC.