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The ITU-T V-Series Recommendations on Data communication over the telephone network specify the protocols that govern approved modem communication standards and interfaces. ''Note:'' the ''bis'' and ''ter'' suffixes are ITU-T standard designators of successive iterations of a standard (''bis'' and ''ter'' are derived from the Latin for "twice" and "thrice"). == General standards == ''Applies to V.1–V.9'' *V.1 is an ITU-T recommendation, entitled ''Equivalence between binary notation symbols and the significant conditions of a two-condition code.'' *V.2 is an ITU-T recommendation, approved in November 1988, titled ''Power levels for data transmission over telephone lines.'' *V.4 is an ITU-T recommendation, approved in November 1988, titled ''General structure of signals of International Alphabet No. 5 code for character oriented data transmission over public telephone networks.'' *V.5 was an ITU-T recommendation, approved in November 1988, titled ''Standardization of data signalling rates for synchronous data transmission in the general switched telephone network.'' It has been withdrawn since. *V.6 was an ITU-T recommendation, approved in November 1988, titled ''Standardization of data signalling rates for synchronous data transmission on leased telephone-type circuits.'' It has been withdrawn since. *V.7 is an ITU-T recommendation, approved in November 1988, titled ''Definitions of terms concerning data communication over the telephone network.'' *V.8 is an ITU-T recommendation, first approved in September 1994, titled ''Procedures for starting sessions of data transmission over the public switched telephone network.'' It has been superseded three times. The current version was approved in November 2000. *V.8bis is an ITU-T recommendation, first approved in August 1996, titled ''Procedures for the identification and selection of common modes of operation between data circuit-terminating equipments (DCEs) and between data terminal equipments (DTEs) over the public switched telephone network and on leased point-to-point telephone-type circuits.'' It has been superseded twice. The current version was approved in November 2000. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「List of ITU-T V-series recommendations」の詳細全文を読む スポンサード リンク
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