Patent ID: 7991046
Filing Date: 2011-08-02
Classification: G01R,H04B,H04L

Abstract:
1. A method of determining jitter from a communication channel between test equipment and a connection for a device under test (DUT), the method comprising: connecting a sampling device to the communication channel in lieu of connecting the DUT to the communication channel, the sampling device being connected to the communication channel at a point where the DUT would connect to the communication channel; using the sampling device to sample test data in the communication channel at the point where the DUT would connect to the communication channel, wherein the test data travels through the communication channel at a fist rate, wherein the test data is sampled at a second rate that is less than the first rate, and wherein test data is output by test equipment to the point where the DUT would connect to the communication channel, jitter being introduced into the test data by passage of the test data through the communication channel and appearing at the point where the DUT would connect to the communication channel; determining a first amount of jitter in the sampled data relative to the test data; and determining a second amount of jitter at the point where the DUT would connect to the communication channel, the second amount of jitter comprising the jitter introduced by the passage of the test data through the communication channel.