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Switching Plane Architecture for a Routing Matrix with a TX Matrix Plus Router


The routing matrix switch fabric consists of five data switching planes. One of the five data switching planes acts as a backup spare to the remaining data switching planes. Each data switching plane consists of one or two F13 SIBs, four F2S SIBs in the TX Matrix Plus router, and one SIB in each line-card chassis connected to the F13 SIB.

The F13 SIBs in the TX Matrix Plus router connect through high-speed optical links within switching plane cables to the LCC SIBs located in the same switching plane.

Table 1: SIBs Supported for Each Routing Matrix Configuration

Routing Matrix Configuration

TX Matrix Plus F13 SIBs

Line-Card Chassis (LCC) SIBs













Each F13 SIB in the switching plane connects thorough the midplane to the four F2 SIBs in the switching plane. Table 2 shows these connections.

Table 2: Connections Between F13 SIBs and F2 SIBs


F13 SIB Slot

F2 SIB Slot


Slot 0 and slot 1

Slot 0/0

Slot 0/2

Slot 0/4

Slot 0/6


Slot 3 and slot 4

Slot 1/0

Slot 1/2

Slot 1/4

Slot 1/6


Slot 6 and slot 7

Slot 2/0

Slot 2/2

Slot 2/4

Slot 2/6


Slot 8 and slot 9

Slot 3/0

Slot 3/2

Slot 3/4

Slot 3/6


Slot 11 and slot 12

Slot 4/0

Slot 4/2

Slot 4/4

Slot 4/6

Figure 1 illustrates the switch fabric architecture.

Figure 1: Routing Matrix Switch Fabric Architecture
Routing Matrix Switch Fabric

The switch fabric uses ASICs to perform high-speed packet forwarding between the LCCs in the routing matrix. The switch fabric allows high-priority traffic from any Packet Forwarding Engine to an egress Packet Forwarding Engine to be given preferential treatment over low-priority traffic from any other Packet Forwarding Engine.

  1. A packet that enters an interface on a PIC in an LCC and is destined for another LCC in the routing matrix is first forwarded to a Packet Forwarding Engine on the source LCC.
  2. The packet is then forwarded through the Packet Forwarding Engine from the source LCC through the switch fabric on the TX Matrix Plus router, to the target LCC.
  3. The Packet Forwarding Engine on the target LCC forwards the packet to the destination PIC and interface.