Abstract: A method for detecting an open circuit on a cable for 1GBASE-T and/or 10GBASE-T Ethernet communications includes transmitting one or more autonegotiation signals during an attempt to identify an open cable. The autonegotiation signals are sent from an autonegotiation-capable Ethernet transceiver connected to a cable with a twisted pair. The method includes receiving one or more waveforms from the cable, analyzing the received one or more waveforms, and transmitting an open cable alert in response to determining that the received one or more waveforms are indicative of a reflected autonegotiation signal.

Abstract: A method for tunning high speed link parameters for cables with a transceiver at each end includes 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 with a transceiver connected to each end of the cable. Establishing the link includes establishing a communication link over the cable between the first computing device and the second computing device. The method includes receiving an eye pattern quality message from the second computing device using a device discovery protocol. The eye pattern quality message includes quality information of a received waveform corresponding to the transmitted eye pattern bit sequence. The method includes 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.