Technical Documentation
Related Documentation
T640 FPC Description
Up to eight Flexible PIC Concentrators (FPCs) install vertically in the front of the T640 Core Router (see Figure 1). The FPC slots are numbered left to right from FPC0 to FPC7. 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 one or two Packet Forwarding Engines. The Packet Forwarding Engines receive incoming packets from the PICs installed on the FPC and forward them through the switch planes to the appropriate destination port. Each FPC contains data memory that is managed by the Queuing and Memory Interface ASICs.
FPCs are hot-removable and hot-insertable, as described in T640 Field-Replaceable Units. 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 continues uninterrupted during this process. For FPC replacement instructions, see Replacing a T640 FPC.
Each FPC consists of the following components:
- FPC card carrier.
- One or two Packet Forwarding Engines, consisting of Layer 2/Layer 3 Packet Processing ASICs, Switch Interface ASICs, T-series Internet Processor ASICs, and a Memory Mezzanine Board (MMB) which includes the Queuing and Memory Interface ASICs. Each Type 1, Type 2, and Type 4 FPC has one Packet Forwarding Engine, and each Type 3 FPC has two Packet Forwarding Engines.
- Processor Mezzanine Board (PMB), which includes a 300-MHz CPU, system controller, 256 MB of SDRAM, and two Fast Ethernet interfaces.
- Two LEDs, located on the craft interface above the FPC, that display the status of the FPC. For more information about the FPC LEDs, see T640 Craft Interface FPC LEDs and Online/Offline Buttons.
- FPC online/offline button, located on the craft interface above the FPC.
Figure 1: FPC Installed in a T640 Chassis
FPC Terminology
Regardless of whether you are holding an FPC vertically or horizontally, this document uses the same terms for all four edges of the FPC (see Figure 2):
- Faceplate—Edge of the FPC that has slots into which you insert the PICs
- Connector edge—Edge opposite the faceplate; this edge has the connectors that attach to the midplane
- Top edge—Edge at the top of the FPC when it is vertical
- Bottom edge—Edge at the bottom of the FPC when it is vertical
Figure 2: FPC Edges
Identifying T640 FPCs
Check the label on the faceplate to identify the FPC. For FPCs without a label on the faceplate, check the location of a PIC's offline button and how the PIC is secured to the FPC. See Table 1.
Table 1: Identifying the FPCs Supported by the T640 Router
FPC | Label on the FPC Faceplate | Location of PIC Offline Button | Method of Securing the PIC to the FPC |
|---|---|---|---|
Enhanced FPC1 | E FPC1 | Slightly beneath the faceplate of the PIC | Two captive screws |
Enhanced II FPC1 | E-II FPC1 | Slightly beneath the faceplate of the PIC | Two captive screws |
Enhanced Scaling FPC1 | T640-FPC1-ES | Slightly beneath the faceplate of the PIC | Two captive screws |
FPC2 | None | Inside an opening directly on the faceplate of each PIC | Two captive screws |
Enhanced FPC2 | E FPC2 | Inside an opening directly on the faceplate of each PIC | Two captive screws |
Enhanced II FPC2 | E-II FPC2 | Inside an opening directly on the faceplate of each PIC | Two captive screws |
Enhanced Scaling FPC2 | T640-FPC2-ES | Inside an opening directly on the faceplate of each PIC | Two captive screws |
FPC3 | None | Inside an opening directly on the faceplate of each PIC | Plastic ejector handle at the top of the PIC faceplate; captive screw at the bottom of the PIC faceplate |
Enhanced FPC3 | E FPC3 | Inside an opening directly on the faceplate of each PIC | Two plastic ejector handles at the top and bottom of the PIC faceplate |
Enhanced II FPC3 | E-11 FPC3 | Inside an opening directly on the faceplate of each PIC | Two plastic ejector handles at the top and bottom of the PIC faceplate |
Enhanced Scaling FPC3 | T640-FPC3-ES | Inside an opening directly on the faceplate of each PIC | Two plastic ejector handles at the top and bottom of the PIC faceplate |
T640 Enhanced Scaling FPC4 | FPC4 | Inside an opening directly on the faceplate of each PIC | Two plastic ejector handles at the top and bottom of the PIC faceplate |
T640 Enhanced Scaling FPC4-1P | T640-FPC4–1P-ES | Inside an opening directly on the faceplate of each PIC | Two plastic ejector handles at the top and bottom of the PIC faceplate |
The T640 router supports the Enhanced Scaling FPC1, as shown in Figure 3.
Figure 3: Enhanced Scaling FPC1 Supported by the T640 Router
The T640 router supports the standard FPC2 and FPC3, as shown in Figure 4.
Figure 4: Standard FPC2 and FPC3 Supported by the T640 Router
The T640 router supports the Enhanced II FPC1, FPC2 and FPC3, as shown in Figure 5.
Figure 5: Enhanced II FPC1, FPC2, and FPC3 Supported by the T640 Router
The T640 router supports the Enhanced Scaling FPC2, as shown in Figure 6.
Figure 6: Enhanced Scaling FPC2 Supported by the T640 Router
The T640 router supports the Enhanced Scaling FPC3, as shown in Figure 7.
Figure 7: Enhanced Scaling FPC3 Supported by the T640 Router
The T640 router supports the Enhanced Scaling FPC4, as shown in Figure 8.
Figure 8: Enhanced Scaling FPC4 Supported by the T640 Router
The T640 router supports the T640 Enhanced Scaling FPC4-1P, as shown in Figure 9.
Figure 9: T640 Enhanced Scaling FPC4-1P Supported by the T640 Router
