transmitting, in response to establishing a link, an eye pattern bit sequence from a first computing device to a second computing device over a cable comprising a transceiver connected to each end of the cable, wherein establishing the link comprises establishing a communication link over the cable between the first computing device and the second computing device;

receiving an eye pattern quality message from the second computing device using a device discovery protocol, the eye pattern quality message comprising quality information of a received waveform corresponding to the transmitted eye pattern bit sequence;

adjusting transmission parameters for transmission over the cable in response to the quality information; and

retransmitting the eye pattern bit sequence using the adjusted transmission parameters.