Basic Principles of Digital Subscriber Sets

The introduction of digital exchanges into the local telephone network in the future will lead to the application of digital subscriber sets, where all speech and signal coding is carried out in the proximity of the telephone. In order to use the two-wire network the problems of digital transmission must be considered together with those of synchronization, signaling, speech conversion, and powering. This paper deals with the basic solutions and shows the concept for a first model of a digital subscriber set.