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Outgoing I/O Manager ASIC

When the result cell is received by the I/O Manager ASIC, it is placed into a queue to await transmission on the physical media. The specific queue used by the ASIC is determined by the forwarding class associated with the data packet. The configuration of the queue itself helps determine the service the packet receives while in this queued state. This functionality guarantees that certain packets will be serviced and transmitted before other packets. In addition, the queue settings and the packet’s loss priority setting determine which packets might be dropped from the network during periods of congestion.

In addition to queuing the packet, the outgoing I/O Manager ASIC is responsible for ensuring that CoS bits in the packet’s header are correctly set before it is transmitted. This rewrite function helps the next downstream router perform its CoS function in the network.

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