DIGITAL ELECTRONIC EXCHANGE FOR DATA EXCHANGE

PURPOSE:To simplify the circuit constitution of a digital electronic exchange and to increase the data processing speed, by applying a frame constitution process for production of signals. CONSTITUTION:A digital electronic exchange for data exchange is provided with a data terminal unit 1, a data terminal interface device 2 and an electronic exchange main body 3. When the unit 1 transmits data d1-d7, a frame coupling circuit 2b of the device 2 adds the prescribed bits of a frame synchronizing signal S, the control signals C for the digital electronic exchange for data exchange and the terminal interface and a control signal T between data terminals to the data d1-d7. These signals S, C and T and data d1-d7 are set serial to each other and sent to a transmission circuit 2d and then to the main body 3. These signals S-T are separated from each other by a frame separating circuit 2c of the device 2, and only data d1-d7 are sent to the unit 1. Thus the circuit constitution is simplified for the digital electronic exchange and the data processing speed is increased.