ISO/TR 7477:1985

Describes various arrangements for interconnection of Data Terminal Equipment (DTE), without intermediate Data Circuit-terminating Equipment, concerning electrical, mechanical, and functional characteristics. Applies to DTEs with interface circuits standardized in CCITT Recommendation V.24 for data transmission over telephone networks or with interface circuits standardized in CCITT Recommendation X.24 for transmission over public data networks. Applies primarily to DTEs employing the balanced electrical characteristics of CCITT Recommendation V.11 (X.27) for data signalling rates up to 10 Mbit/s.