Patent ID: 8447567

Claim:
A method of determining the performance of a digital subscriber line, the method comprising: i) generating, by a processor, a model for each of a plurality of data transmission parameters based on measurements taken from a plurality of digital subscriber lines, wherein each model models the relationship between a data transmission parameter as a function of the upstream line attenuation; ii) measuring the data transmission parameters and an upstream line attenuation associated with a test digital subscriber line; and for each of the measured data transmission parameters a) determining an expected value for the measured data transmission parameter corresponding to the measured upstream attenuation using the model associated with said measured data transmission parameter; and b) calculating a parameter performance indicator based on the difference between the expected value and the measured value for the measured data transmission parameter; and then iii) calculating a line performance indicator for the test digital subscriber line based on the sum of the parameter performance indicators for each of the measured data transmission parameters.