General (V.1 - V.8 bis) Interfaces and voice-band modems (V.10 - V.34) Wide-band modems (V.36 - V.38) Error control (V.41 - V.42 bis) Transmission quality and maintenance (V.50 - V.80) Interworking with other networks (V.100 - V.230)
Date of Update: 16 Dec 1996
List of ITU-T V-Series Recommendations in force
Series V Data communication over the telephone network
General
V.1 (12/72) Equivalence between binary notation symbols and the significant conditions of a two-condition code Blue Book Fascicle VIII.1
V.2 (11/80) Power levels for data transmission over telephone lines Blue Book Fascicle VIII.1
V.4 (11/88) General structure of signals of international alphabet No. 5 code for character oriented data transmission over public telephone networks Blue Book Fascicle VIII.1
V.7 (11/88) Definitions of terms concerning data communication over the telephone network Blue Book Fascicle VIII.1
V.8 (9/94) Procedures for starting sessions of data transmission over the general switched telephone network
V.8 bis (8/96) 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 general switched telephone network and on leased point-to-point telephone-type circuits
Interfaces and voiceband modems
V.10 (3/93) Electrical characteristics for unbalanced double-current interchange circuits operating at data signalling rates nominally up to 100 kbit/s This Recommendation is also included but not published in X series under alias number X.26.
V.11 (10/96) Electrical characteristics for balanced double-current interchange circuits operating at data signalling rates up to 10 Mbit/s This Recommendation is also included but not published in X series under alias number X.27.
V.12 (8/95) Electrical characteristics for balanced double-current interchange circuits for interfaces with data signalling rates up to 52 Mbit/s
V.13 (3/93) Simulated carrier control
V.14 (3/93) Transmission of start-stop characters over synchronous bearer channels
V.15 (10/84) Use of acoustic coupling for data transmission Blue Book Fascicle VIII.1
V.16 (10/76) Medical analogue data transmission modems Blue Book Fascicle VIII.1
V.17 (2/91) A 2-wire modem for facsimile applications with rates up to 14 400 bit/s
V.18 (10/96) Operational and interworking requirements for DCEs operating in the text telephone mode
V.19 (10/84) Modems for parallel data transmission using telephone signalling frequencies Blue Book Fascicle VIII.1
V.21 (10/84) 300 bits per second duplex modem standardized for use in the general switched telephone network Blue Book Fascicle VIII.1
V.22 (11/88) 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 Blue Book Fascicle VIII.1
V.22 bis (11/88) 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 Blue Book Fascicle VIII.1
V.23 (11/88) 600/1200-baud modem standardized for use in the general switched telephone network Blue Book Fascicle VIII.1
V.24 (10/96) List of definitions for interchange circuits between data terminal equipment (DTE) and data circuit-terminating equipment (DCE)
V.25 (10/96) Automatic answering equipment and general procedures for automatic calling equipment on the general switched telephone network including procedures for disabling of echo control devices for both manually and automatically established calls
V.25bis (10/96) Synchronous and asynchronous automatic dialling procedures on switched networks
V.25 ter (8/95) Serial asynchronous automatic dialling and control
V.25 ter An A (8/96) Procedure for DTE-controlled call negotiation
Supplement (4/95) Supplement to ITU-T Recommendation V.25 ter
V.26 (10/84) 2400 bits per second modem standardized for use on 4-wire leased telephone-type circuits Blue Book Fascicle VIII.1
V.26 bis (10/84) 2400/1200 bits per second modem standardized for use in the general switched telephone network Blue Book Fascicle VIII.1
V.26 ter (11/88) 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 Blue Book Fascicle VIII.1
V.27 (10/84) 4800 bits per second modem with manual equalizer standardized for use on leased telephone-type circuits Blue Book Fascicle VIII.1
V.27 bis (10/84) 4800/2400 bits per second modem with automatic equalizer standardized for use on leased telephone-type circuits Blue Book Fascicle VIII.1
V.27 ter (10/84) 4800/2400 bits per second modem standardized for use in the general switched telephone network Blue Book Fascicle VIII.1
V.28 (3/93) Electrical characteristics for unbalanced double-current interchange circuits
V.29 (11/88) 9600 bits per second modem standardized for use on point-to-point 4-wire leased telephone-type circuits Blue Book Fascicle VIII.1
V.31 (12/72) Electrical characteristics for single-current interchange circuits controlled by contact closure Blue Book Fascicle VIII.1
V.31 bis (10/84) Electrical characteristics for single-current interchange circuits using optocouplers Blue Book Fascicle VIII.1
V.32 (3/93) A family of 2-wire, duplex modems operating at data signalling rates of up to 9600 bit/s for use on the general switched telephone network and on leased telephone-type circuits
V.32 bis (2/91) A duplex modem operating at data signalling rates of up to 14 400 bit/s for use on the general switched telephone network and on leased point-to-point 2-wire telephone-type circuits
V.33 (11/88) 14 400 bits per second modem standardized for use on point-to-point 4-wire leased telephone-type circuits Blue Book Fascicle VIII.1
V.34 (10/96) A modem operating at data signalling rates of up to 33 600 bit/s for use on the general switched telephone network and on leased point-to-point 2-wire telephone-type circuits
Wideband modems
V.36 (11/88) Modems for synchronous data transmission using 60-108 kHz group band circuits Blue Book Fascicle VIII.1
V.37 (11/88) Synchronous data transmission at a data signalling rate higher than 72 kbit/s using 60-108 kHz group band circuits Blue Book Fascicle VIII.1
V.38 (10/96) A 48/56/64 kbit/s data circuit terminating equipment standardized for use on digital point-to-point leased circuits
Error control
V.41 (12/72) Code-independent error-control system Blue Book Fascicle VIII.1
V.42 (10/96) Error-correcting procedures for DCEs using asynchronous-to-synchronous conversion
V.42 bis (1/90) Data compression procedures for data circuit- terminating equipment (DCE) using error correction procedures
Transmission quality and maintenance
V.50 (10/68) Standard limits for transmission quality of data transmission Blue Book Fascicle VIII.1
V.51 (11/88) Organization of the maintenance of international public switched telephone circuits used for data transmission This Recommendation is published under alias number M.729.
V.53 (10/68) Limits for the maintenance of telephone-type circuits used for data transmission Blue Book Fascicle VIII.1
V.54 (11/88) Loop test devices for modems Blue Book Fascicle VIII.1
V.55 (11/88) Impulsive noise measuring equipment for telephone-type circuits This Recommendation is published under alias number O.71.
V.56 (11/88) Comparative tests of modems for use over telephone-type circuits Blue Book Fascicle VIII.1
V.56 bis (8/95) Network transmission model for evaluating modem performance over 2-wire voice grade connections
V.56 ter (8/96) Test procedure for evaluation of 2-wire 4 kHz voiceband duplex modems
V.58 (9/94) Management information model for V-Series DCEs
V.61 (8/96) A simultaneous voice plus data modem, operating at a voice plus data signalling rate of 4800 bit/s, with optional automatic switching to data-only signalling rates of up to 14400 bit/s, for use on the General Switched Telephone Network and on leased point-to-point 2-wire telephone type circuits
V.70 (8/96) Procedures for the simultaneous transmission of data and digitally encoded voice signals over the GSTN, or over a 2-wire leased point-to-point telephone type circuits
V.75 (8/96) DSVD terminal control procedures
V.76 (8/96) Generic multiplexer using V.42 LAPM-based procedures
V.80 (8/96) In-band DCE control and synchronous data modes for asynchronous DTE
Interworking with other networks
V.100 (10/84) Interconnection between public data networks (PDNs) and the public switched telephone networks (PSTN) Blue Book Fascicle VIII.1
V.110 (10/96) Support of data terminal equipments with V-series type interfaces by an integrated services digital network This Recommendation is also included but not published in I series under alias number I.463.
V.120 (10/96) Support by an ISDN of data terminal equipment with V-series type interfaces with provision for statistical multiplexing This Recommendation is also included but not published in I series under alias number I.465.
V.130 (8/95) ISDN terminal adaptor framework
V.230 (11/88) General data communications interface layer 1 specification Blue Book Fascicle VIII.1