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Regarding MAC in Full Duplex Ethernet

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Guru59

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Hello all,

below is the statement from Cisco Ethernet document which says Full duplex is simultaneous operation.

"Full Duplex operation is an optional MAC capability that allows MAC to transmit and receive frames simultaneously "

I have a doubt regarding this that MAC that is designed to have full duplex functionality must be able to Tx and Rx at the same time.

How is this possible.

I mean if the Tx of MAC1 is connected to Rx of MAC2 and vice versa also how will the host of the either MAC is going to tackle Tx messages and Rx messages simultaneously.

Let us take an eg : MAC1 Trasmits message at 10th sec and it continues till 15th sec (total trasmission time is 5 sec) and MAC2 starts transmitting at 14th sec which means MAC1 which is Transmitting must also take message from 14th sec.

how is this achieved.

Thanks
 

The Tx and Rx path are separate and independent of each other (except for the pause frame response logic). Also, the logic after the MAC (user's logic) should also be split up into separate and independent Tx and Rx path. There, the entire MAC device can tx/rx data simultaneous.

- Hung
 

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