Method for testing a communication channel

摘要

A method of evaluating the characteristics of a subscriber loop associated with a customer modem comprises the steps of receiving line probing data from the modem and analyzing the line probing data to determine the circuit characteristics of the subscriber loop which relate to communication rate performance. The method generates a gain slope value as a function of the line probing data which is indicative of the length of the subscriber loop. The method also generates a loaded slope value as a function of the line probing data which is indicative of an inductive load on the subscriber loop. The method also generates an A/D value as a function of the line probing data which is indicative of an analog-to-digital and digital-to-analog conversion on the subscriber loop. The method then outputs an expected communication rate for the subscriber loop as a function of the gain slope, loaded slope, and A/D values, thereby providing a circuit analysis of the customer subscriber loop.