Polarity detection system

A communication device comprising:

• a physical coding sublayer (PCS) module comprising:
• a descrambler that is configurable to synchronize with a scrambler of another communication device;
• and
• a polarity corrector that is configurable to reverse polarities of symbols transmitted to and received from the another communication device;
• and
• wherein the PCS module is configured to:
• receive a clock source from the another communication device for link initialization, receive, during a half-duplex link initialization stage, first training symbols having a first polarity and second training symbols having a second polarity, reverse the first polarity and the second polarity, synchronize, during the half-duplex stage, the descrambler to the scrambler of the another communication device based at least on the reversed first polarity associated with the first training symbols, and configure the polarity corrector to reverse the symbols subsequently transmitted to, and received from the another communication device.

A computer program product comprising instructions stored in a tangible computer-readable storage medium, the instructions comprising:

• instructions for receiving first training symbols via a first channel and second training symbols via a second channel during a half-duplex link initialization stage;
• instructions for determining, during the half-duplex link initialization stage, whether a first polarity associated with the first channel is reversed based at least on whether a descrambler can be locked using at least the first symbols;
• and
• instructions for reversing the first polarity of first symbols subsequently received, and transmitted, over the first channel and a second polarity of second symbols subsequently received, and transmitted, over the second channel when the first polarity associated with the first channel is reversed.