Determining the signal quality of an electrical interconnect

A network device may include PHY circuitry comprising transmit (Tx) and receive (Rx) circuitry configured to be coupled to a respective channel to communicate with an external device using an Ethernet communications protocol, and test circuitry configured to: designate a through channel and at least one crosstalk channel from among the channels; determine, in the time domain, an approximate available signal voltage of a first response signal, wherein the first response signal is in response to a test signal applied to the through channel; determine a first noise profile of the first response signal; determine a second noise profile of a second response signal, wherein the second response signal is in response to the test signal applied on a crosstalk channel and measured on the through channel; and determine a signal-to-noise ratio of the through channel based on, at least in part, the available signal voltage and the noise profiles.