1. A method of operating a telecommunications network of the type having a plurality of subscribers connected to a switch through a plurality of subscriber lines, the method comprising: a) making a plurality of one-ended electrical measurements on a subscriber line; b) preparing a feature vector from the electrical measurements; c) applying the feature vector to a first neural network to predict upstream data rate of the subscriber line if used to provide high speed data services; d) applying the feature vector to a second neural network to predict the downstream data rate of the subscriber line if used to provide high speed data services; e) combining the output of the first neural network and the second neural network to predict a service level of the subscriber line; f) taking a business action related to the delivery of high speed data services based on the service level for the subscriber line.