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ITU-T V.21 300 Bits per second duplex modem standardized for use in the general switched telephone network
ITU-T V.19 Modems for parallel data transmission using telephone signalling frequencies
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
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