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The P580/P882 has two backplane connections or ports for each media module. These ports connect the media modules to the backplane Cross Bar Switch Fabric, which in turn connects all modules to all other modules and ports. These ports are referred to as "Switch Fabric Ports". There are two Switch Fabric ports per media module slot (slots 2 through 7, or slots 2-17) and one fabric port for the Supervisor slot (slot 1) (Figure�48).Each 80-series media module can use up to two fabric ports in the slot, the number of Forwarding Engines to fabric ports varies with the media module. There is anywhere from one to four Forwarding Engines per fabric port for each 80-series media module (Table�37).
The number of Forwarding Engines are distributed among the ports for 80-series modules. The 80-series 10/100 Mbps media modules are distributed with 12 10/100 ports for each Forwarding engine. For example, the 48 port 10/100 media module has four Forwarding Engines. The first 12 (1-12) ports are on the first Forwarding Engine, the second 12 (13-24) are on the second Forwarding Engine, which in turn use one fabric port, the third and fourth grouping of 12 ports each have a Forwarding Engine and use the second fabric port. The Forwarding Engines are distributed on a one to one basis for the 80-series Gigabit media modules. For example the 8 port 1000 TX, the first four ports have four Forwarding Engines, one for each Gigabit port (1-4), and uses one fabric port, the other four ports (5-8) also have four Forwarding Engines, which use the second fabric port.
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