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ITU-T V.26bis 2400/1200-bits per second modem standardized for use in the general switched telephone network
ITU-T V.26ter 2400 bits per second duplex modem using the echo cancellation technique standardized for use on the general switched telephone network and on point-to-point 2-wire leased telephone-type circuits
ITU-T V.27 4800 bits per second modem with manual equalizer standardized for use on leased telephone-type circuits
ITU-T V.27bis 4800/2400 bits per second modem with automatic equalizer standardized for use on leased telephone-type circuits
ITU-T V.27ter 4800/2400 bits per second modem standardized for use in the general switched telephone network
ITU-T V.29 9600 bits per second modem standardized for use on point-to-point 4-wire leased telephone-type circuits
ITU-T V.31 Electrical characteristics for single-current interchange circuits controlled by contact closure
ITU-T V.31bis Electrical characteristics for single-current interchange circuits using optocouplers
ITU-T V.33 14400 bits per second modem standardized for use on point-to-point 4-wire leased telephone-type circuits
ITU-T V.36 Modems for synchronous data transmission using 60-108 kHz group band circuits
ITU-T V.37 Synchronous data transmission at a data signalling rate higher than 72 kbit/s using 60-108 kHz group band circuits
ITU-T V.41 Code-independent error-control system