Patent ID: 9197288
Filing Date: 2015-11-24
Classification: H04B

Abstract:
1. A network device, comprising: physical layer (PHY) circuitry comprising transmit circuitry (Tx) and receive circuitry (Rx), wherein the Tx and Rx circuitry are configured to be coupled to a respective channel to communicate with an external device via the channels, wherein the network device configured to communicate with the 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 an approximate peak amplitude, S, of a first response signal that is measured on the through channel and generated in response to a test signal on the through channel; modify the first response signal with at least one signal filter to generate a first modified signal; determine a noise region of the first modified signal; generate a first probability density function (PDF) of at least a portion of the noise region of the first modified signal; determine a second response signal that is measured on the through channel and generated in response to the test signal on a crosstalk channel; modify the second response signal with the at least one signal filter to generate a second modified signal; generate a second PDF of at least a portion of the second modified signal; combine the first and second PDFs to generate a total noise PDF of the through channel; and determine a signal-to-noise ratio of the through channel based on, at least in part, S and the total noise PDF.