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T4000 FPC Description


FPCs are hot-removable and hot-insertable.

T4000 FPC Slots

Up to eight FPCs install vertically in the front of the router. The FPC slots are numbered FPC0 through FPC7, left to right. 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.

T4000 FPC Function

FPCs house the PICs that connect the T4000 Core Router to network media. The main function of an FPC is to connect the PICs installed in it to the other T4000 router components. The Packet Forwarding Engine receives incoming packets from the PICs installed on the FPC and forwards them through the switch planes to the appropriate destination port. In a maximum configuration with eight Type 5 FPCs installed, the Packet Forwarding Engines can forward up to 4000 million packets per second (Mpps) for all packet sizes. The T4000 Core Router provides up to 2000 gigabits per second (Gbps), full duplex switching (4000 Gbps of any-to-any, nonblocking, half-duplex switching).

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 FPCs continues uninterrupted during this process.

T4000 FPC Components

Each FPC consists of the following components:

  • FPC card carrier

  • One or two Packet Forwarding Engines

    • Each T1600-FPC4-ES has two Packet Forwarding Engines. Each Packet Forwarding Engine consists 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 T4000-FPC5-3D or T4000-FPC5-LSR has two Packet Forwarding Engines. Each Packet Forwarding Engine consists of a Packet Processing ASIC, Interface ASIC, and Switch Interface ASIC.

  • Processor Mezzanine Board (PMB), which includes a 1.2-GHz CPU, system controller, 4 GB of DDR3 RAM, and two 10/100/1000Mbps three-speed Ethernet interfaces

  • Two LEDs—OK and FAIL—located on the craft interface above the FPC, that display the status of the FPC

  • FPC online/offline button, located on the craft interface above the FPC

Identifying the FPCs

Check the label on the faceplate to identify the FPC. See Table 1.

Table 1: Identifying the FPCs Supported by the Router


Label on the FPC Faceplate

T1600 Enhanced Scaling FPC4


T4000 FPC5

  • T4000-FPC5-3D

  • T4000-FPC5-LSR

The enhanced scaling T1600-FPC4 is shown in Figure 1.

Figure 1: Enhanced Scaling T1600-FPC4
 Enhanced Scaling T1600-FPC4

The T4000 FPC5 (T4000-FPC5-3D and T4000-FPC5-LSR) is shown in Figure 2.

Figure 2: FPC5 Supported by the Router
FPC5 Supported
by the Router

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 3):

  • 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 3: FPC Edges
FPC Edges