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Data communication over the telephone network
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V.1

Equivalence between binary notation symbols and the significant conditions of a two-condition code  

V.2

Power levels for data transmission over telephone lines  

V.4

General structure of signals of International Alphabet No. 5 code for character oriented data transmission over public telephone networks  

V.5

[Withdrawn] Standardization of data signalling rates for synchronous data transmission in the general switched telephone network  
Deleted after its content became technically out of date

V.6

[Withdrawn] Standardization of data signalling rates for synchronous data transmission on leased telephone-type circuits  
Deleted after its content became technically out of date

V.7

Definitions of terms concerning data communication over the telephone network  

V.8

Procedures for starting sessions of data transmission over the public switched telephone network  

V.8bis

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  

V.10

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

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

Electrical characteristics for balanced double-current interchange circuits for interfaces with data signalling rates up to 52 Mbit/s  

V.13

Simulated carrier control  

V.14

Transmission of start-stop characters over synchronous bearer channels  

V.15

Use of acoustic coupling for data transmission  

V.16

Medical analogue data transmission modems  

V.17

A 2-wire modem for facsimile applications with rates up to 14 400 bit/s  

V.18

Operational and interworking requirements for DCEs operating in the text telephone mode  

V.19

Modems for parallel data transmission using telephone signalling frequencies  

V.20

[Withdrawn] Parallel data transmission modems standardized for universal use in the general switched telephone network  
Deleted after its content became technically out of date

V.21

300 bits per second duplex modem standardized for use in the general switched telephone network  

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  

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  

V.23

600/1200-baud modem standardized for use in the general switched telephone network  

V.24

List of definitions for interchange circuits between data terminal equipment (DTE) and data circuit-terminating equipment (DCE)  

V.25

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

Synchronous and asynchronous automatic dialling procedures on switched networks  

V.25ter

Serial asynchronous automatic dialling and control  
This Recommendation was renumbered as V.250 (02/98), and its Annex A as V.251 (02/98) without being republished.

V.26

2400 bits per second modem standardized for use on 4-wire leased telephone-type circuits  

V.26bis

2400/1200 bits per second modem standardized for use in the general switched telephone network  

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  

V.27

4800 bits per second modem with manual equalizer standardized for use on leased telephone-type circuits  

V.27bis

4800/2400 bits per second modem with automatic equalizer standardized for use on leased telephone-type circuits  

V.27ter

4800/2400 bits per second modem standardized for use in the general switched telephone network  

V.28

Electrical characteristics for unbalanced double-current interchange circuits  

V.29

9600 bits per second modem standardized for use on point-to-point 4-wire leased telephone-type circuits  

V.31

Electrical characteristics for single-current interchange circuits controlled by contact closure  

V.31bis

Electrical characteristics for single-current interchange circuits using optocouplers  

V.32

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.32bis

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

14 400 bits per second modem standardized for use on point-to-point 4-wire leased telephone-type circuits  

V.34

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  

V.35

[Withdrawn] Data transmission at 48 kbit/s using 60-108 kHz group band circuits  

V.36

Modems for synchronous data transmission using 60-108 kHz group band circuits  

V.37

Synchronous data transmission at a data signalling rate higher than 72 kbit/s using 60-108 kHz group band circuits  

V.38

A 48/56/64 kbit/s data circuit-terminating equipment standardized for use on digital point-to-point leased circuits  

V.40

[Withdrawn] Error indication with electromechanical equipment  
Deleted after its content became technically out of date

V.41

Code-independent error-control system  

V.42

Error-correcting procedures for DCEs using asynchronous-to-synchronous conversion  

V.42bis

Data compression procedures for data circuit-terminating equipment (DCE) using error correction procedures  

V.43

Data flow control  

V.44

Data compression procedures  

V.50

Standard limits for transmission quality of data transmission  

V.51

Organization of the maintenance of international telephone-type circuits used for data transmission  
This Recommendation is published under alias number M.729.

V.52

[Withdrawn] Characteristics of distortion and error-rate measuring apparatus for data transmission  
Replaced by ITU-T O.153

V.53

Limits for the maintenance of telephone-type circuits used for data transmission  

V.54

Loop test devices for modems  

V.55

Specification for an impulsive noise measuring instrument for telephone-type circuits  
This Recommendation is published under alias number O.71.

V.56

Comparative tests of modems for use over telephone-type circuits  

V.56bis

Network transmission model for evaluating modem performance over 2-wire voice grade connections  

V.56ter

Test procedure for evaluation of 2-wire 4 kHz voiceband duplex modems  
This Recommendation includes 2 diskettes containing the data files used for the voiceband duplex modems throughput tests.

V.57

[Withdrawn] Comprehensive data test set for high data signalling rates  
Replaced by ITU-T O.153

V.58

Management information model for V-Series DCEs  

V.59

Managed objects for diagnostic information of public switched telephone network connected V-series modem DCEs  

V.61

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 14 400 bit/s, for use on the General Switched Telephone Network and on leased point-to-point 2-wire telephone type circuits  

V.70

Procedures for the simultaneous transmission of data and digitally encoded voice signals over the GSTN, or over 2-wire leased point-to-point telephone type circuits  

V.75

DSVD terminal control procedures  

V.76

Generic multiplexer using V.42 LAPM-based procedures  

V.80

In-band DCE control and synchronous data modes for asynchronous DTE  

V.90

A digital modem and analogue modem pair for use on the Public Switched Telephone Network (PSTN) at data signalling rates of up to 56 000 bit/s downstream and up to 33 600 bit/s upstream  

V.91

A digital modem operating at data signalling rates of up to 64 000 bit/s for use on a 4-wire circuit switched connection and on leased point-to-point 4-wire digital circuits  

V.92

Enhancements to Recommendation V.90  

V.100

Interconnection between public data networks (PDNs) and the public switched telephone networks (PSTN)  

V.110

Support by an ISDN of data terminal equipments with V-series type interfaces  
This Recommendation is also included but not published in I Series under alias number I.463.

V.120

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

ISDN terminal adaptor framework  

V.140

Procedures for establishing communication between two multiprotocol audiovisual terminals using digital channels at a multiple of 64 or 56 kbit/s  

V.150.0

Modem-over-IP networks: Foundation  

V.150.1

Modem-over-IP networks: Procedures for the end-to-end connection of V-series DCEs  

V.151

Procedures for the end-to-end connection of analogue PSTN text telephones over an IP network utilizing text relay  

V.152

Procedures for supporting voice-band data over IP networks  

V.153

Interworking between ITU-T T.38 and ITU-T V.152 using IP peering for real-time facsimile services  

V.230

General data communications interface layer 1 specification  

V.250

Serial asynchronous automatic dialling and control  

V.Imp250

Implementor's Guide to V.250  

V.251

Procedure for DTE-controlled call negotiation  

V.252

Procedure for control of V.70 and H.324 terminals by a DTE  

V.253

Control of voice-related functions in a DCE by an asynchronous DTE  

V.254

Asynchronous serial command interface for assistive and multi-functional communication devices  

V.300

A 128 (144) kbit/s data circuit-terminating equipment standardized for use on digital point-to-point leased circuits  

 

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Updated : 2014-05-15