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ITU-T V.2 Power levels for data transmission over telephone lines
ITU-T V.4 General structure of signals of international alphabet no. 5 code for character orientied data transmission over public telephone networks
ITU-T V.7 Definitions of terms concerning data communication over the telephone network
ITU-T V.19 Modems for parallel data transmission using telephone signalling frequencies
ITU-T V.21 300 Bits per second duplex modem standardized for use in the general switched telephone network
ITU-T V.22 1200 Bits per second duplex modem standardized for use in the general switched telephone network and on point-to-point 2-wire leased telephone-type circuits
ITU-T V.22bis 2400 Bits per second duplex modem using the frequency division technique standardized for use on the general switched telephone network and on point-to-point 2-wire leased telephone-type circuits
ITU-T V.23 600/1200-Baud modem standardized for use in the general switched telephone network
ITU-T V.26 2400-bits per second modem standardized for use on 4-wire leased telephone-type circuits
ITU-T V.26bis 2400/1200-bits per second modem standardized for use in the general switched telephone network