DATA INTERFACE FOR TELEPHONE SYSTEM

A data interface for use in a communication system, comprised of a CPU module connected to a central controller of the communication system and a plurality of data terminals associated with respective subscriber sets of the communication system. The CPU module communicates with the central controller in response to user initiated requests at the respective data terminals, and executes telephone special features in association with the respective sets, such as dial-by-name, etc. The CPU module can also be connected to a personal computer; for interfacing the data terminals therewith on a time sharing basis. Furthermore, the CPU module functions as a data switch for implementing electronic mail between the data terminals within the communication system. A communications module incorporating modems and TelexTM interfaces can be connected to the CPU module for establishing communication between the data terminals and one or more outside telephone lines via the communication system.