Reduced pair Ethernet transmission system

1. A system for reduced pair Ethernet transmission, the system comprising:

an interleaver that is operable to:

receive sets of four code symbols from a physical channel sub-layer (PCS) encoder, wherein each code symbol of each set of four code symbols is associated with one of four channels and each set of four code symbols corresponds to one of a plurality of data items encoded by the PCS encoder; and

interleave the sets of four code symbols to generate a plurality of interleaved code symbols;

a serializer that is operable to serialize the plurality of interleaved code symbols to generate a plurality of interleaved and serialized code symbols; and

a transmitter that is operable to transmit the plurality of interleaved and serialized code symbols over an Ethernet medium comprising a single twisted pair of wires.

2. The system of claim 1 , wherein the transmitter is further operable to transmit the plurality of interleaved and serialized code symbols as a plurality of five-level Pulse Amplitude Modulated signals over the Ethernet medium comprising the single twisted pair of wires.

3. The system of claim 1 , wherein each code symbol of at least one of the sets of four code symbols is associated with a different channel of the four channels.

4. The system of claim 1 , wherein the physical channel sub-layer (PCS) encoder comprises a trellis coded modulation (TCM) encoder.

5. The system of claim 1 , wherein the interleaver comprises a convolutional interleaver.

6. The system of claim 1 , wherein the transmitter comprises a physical medium dependent (PMD) transmitter.

7. The system of claim 1 , further comprising:

a receiver that is operable to receive the plurality of interleaved and serialized code symbols over the Ethernet medium comprising the single twisted pair of wires;

a deserializer and a deinterleaver that are operable to deserialize and deinterleave the plurality of interleaved and serialized code symbols; and

a decoder that is operable to determine, for at least one of the plurality of deinterleaved and deserialized code symbols, a first channel of the four channels that is associated with the at least one of the plurality of interleaved and serialized code symbols and decode the plurality of deinterleaved and deserialized code symbols based on the first channel of the four channels that is determined to be associated with the at least one of the plurality of interleaved and serialized code symbols to recover at least one of the sets of four code symbols.

8. The system of claim 7 , wherein the decoder is further operable to determine the first channel of the four channels that is associated with the at least one of the plurality of deinterleaved and deserialized code symbols by determining that the at least one of the plurality of deinterleaved and deserialized code symbols satisfies a first coding rule associated with the first channel of the four channels.

9. The system of claim 8 , wherein the decoder is further operable to:

determine, for another one of the plurality of deinterleaved and deserialized code symbols, a second channel of the four channels that is associated with the another one of the plurality of deinterleaved and deserialized code symbols by determining that the another one of the plurality of deinterleaved and deserialized code symbols satisfies a second coding rule associated with the second channel of the four channels; and

determine an interleaver depth parameter based on the second channel of the four channels determined to be associated with the another of the plurality of deinterleaved and deserialized code symbols and the first channel of the four channels determined to be associated with the at least one of the plurality of deinterleaved and deserialized code symbols.

10. The system of claim 9 , wherein the deserializer and the deinterleaver are further operable to deserialize and deinterleave the plurality of interleaved and serialized code symbols based on the interleaver depth parameter.

11. The system of claim 7 , wherein the receiver comprises a physical medium dependent (PMD) receiver.

12. The system of claim 7 , wherein the deserializer and deinterleaver are further operable to provide the at least one of the sets of four code symbols to a trellis coded modulation (TCM) decoder.

13. The system of claim 7 , wherein the deinterleaver comprises a convolutional deinterleaver.

14. A method for reduced pair Ethernet transmission, the method comprising:

receiving sets of four code symbols from a physical channel sub-layer (PCS) encoder, wherein each code symbol of each set of four code symbols is associated with one of four channels and each set of four code symbols corresponds to one of a plurality of data items encoded by the PCS encoder;

interleaving and serializing the sets of four code symbols to generate a plurality of interleaved and serialized code symbols;

transmitting the plurality of interleaved and serialized code symbols over an Ethernet medium comprising a single twisted pair of wires;

receiving the plurality of interleaved and serialized code symbols over the Ethernet medium comprising the single twisted pair of wires;

deserializing and deinterleaving the plurality of interleaved and serialized code symbols;

determining, for at least one of the plurality of deinterleaved and deserialized code symbols, a first channel that is associated with the at least one of the plurality of interleaved and serialized code symbols based at least on an equation associated with the first channel that is satisfied by the at least one of the plurality of interleaved and serialized code symbols; and

decoding the plurality of deinterleaved and deserialized code symbols based on the first channel determined to be associated with the at least one of the plurality of deinterleaved and deserialized code symbols.

15. The method of claim 14 , wherein the transmitting the plurality of interleaved and serialized code symbols over the Ethernet medium comprising the single twisted pair of wires further comprises transmitting the plurality of interleaved and serialized code symbols as a plurality of five-level Pulse Amplitude Modulated signals over the Ethernet medium comprising the single twisted pair of wires.

16. The method of claim 14 , wherein each code symbol of at least one of the sets of four code symbols is associated with a different channel of the four channels.

17. The method of claim 14 , wherein the determining, for at least one of the plurality of deinterleaved and deserialized code symbols, a first channel that is associated with the at least one of the plurality of interleaved and serialized code symbols further comprises:

determining the first channel of the four channels that is associated with the at least one of the plurality of deinterleaved and deserialized code symbols by determining that the at least one of the plurality of deinterleaved and deserialized code symbols satisfies a first coding rule associated with the first channel of the four channels.

18. The method of claim 17 , further comprising:

determining, for another one of the plurality of deinterleaved and deserialized code symbols, a second channel of the four channels that is associated with the another one of the plurality of deinterleaved and deserialized code symbols by determining that the another one of the plurality of deinterleaved and deserialized code symbols satisfies a second coding rule associated with the second channel of the four channels; and

determining an interleaver depth parameter based on the second channel of the four channels determined to be associated with the another of the plurality of deinterleaved and deserialized code symbols and the first channel of the four channels determined to be associated with the at least one of the plurality of deinterleaved and deserialized code symbols.

19. The method of claim 18 , wherein the deserializing and deinterleaving the plurality of interleaved and serialized code symbols further comprises:

deserializing and deinterleaving the plurality of interleaved and serialized code symbols based on the interleaver depth parameter.

20. A non-transitory machine-readable medium embodying instructions that, when executed by a machine, allow the machine to perform a method for reduced pair Ethernet transmission, the method comprising:

receiving a plurality of interleaved and serialized code symbols over an Ethernet medium comprising a single twisted pair of wires, the plurality of interleaved and serialized code symbols corresponding to sets of four code symbols that are each associated with one of a plurality of data items encoded by a physical channel sub-layer (PCS) encoder;

deserializing and deinterleaving the plurality of interleaved and serialized code symbols;

determining, for at least one of the plurality of deinterleaved and deserialized code symbols, a first channel that is associated with the at least one of the plurality of interleaved and serialized code symbols based at least on an equation that is associated with the first channel; and

decoding the plurality of deinterleaved and deserialized code symbols based on the first channel determined to be associated with the at least one of the plurality of deinterleaved and deserialized code symbols.