公开(公告)号：US09197288B2

公开(公告)日：2015-11-24

申请号：US13994191

申请日：2013-03-08

Applicant: Intel Corporation

Inventor： Richard Mellitz ,  Adee Ran

IPC: H04B3/32 ,  H04B3/46 ,  H04B3/487

CPC classification number: H04B3/487 ,  H04B3/46

Abstract: One embodiment provides a network device that includes 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. The test circuitry is 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 in response to the test signal applied on the through channel; 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 approximate available signal voltage and the first and second noise profiles.

Abstract translation: 一个实施例提供一种网络设备，其包括包括发射电路（Tx）和接收电路（Rx）的PHY电路，其中Tx和Rx电路被配置为耦合到相应的信道以经由信道与外部设备通信，其中， 网络设备，被配置为使用以太网通信协议与外部设备进行通信; 和测试电路。 测试电路被配置为：从通道中指定通道和至少一个串扰通道; 在时域中确定第一响应信号的近似可用信号电压，其中所述第一响应信号响应于施加到所述通道的测试信号; 响应于施加在通道上的测试信号，确定第一响应信号的第一噪声分布; 确定第二响应信号的第二噪声分布，其中所述第二响应信号响应于施加在串扰信道上并在所述通道上测量的所述测试信号; 并且至少部分地基于近似可用信号电压和第一和第二噪声分布来确定通道的信噪比。