START-STOP SYNCHRONIZING TYPE DATA COMMUNICATION SYSTEM

PURPOSE:To obtain a long distance and to economize a system by using a terminal equipment by transforming a long space signal to plural framing infor mation to transmit a digital high speed data transmission line and reproducing the long space signal from the plural framing error information in an incoming call side. CONSTITUTION:Speed transformers 3, 4 having a transmission speed transform ing means 30 by defining plural framing errors to be the framing error informa tion, transforming and transmitting a data transmission speed at the time of receiving the long space signal of the plural frames and a receiving speed transforming means 31 for repeatedly transmitting the frame including the framing error information as the space signal, transmitting a mark signal accord ing to the receiving of normal frameing information and reproducing the space signal are respectively connected to a center 1 and the terminal equipment 2 through low speed data transmission lines 6, 7. Both the speed transformers 3, 4 are connected by the digital high speed data transmission line 5. Thereby, the long distance and the economization of a communication system can be realized.