ITU-T V-Series Recommendations
(last updated: 31-Oct-2000 10:01)
V Series: Data Communication Over the Telephone Network
Data Communication Over the Telephone Network - General
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V.1 (11/88)
Equivalence between binary notation symbols and the significant
conditions of a two-condition code.
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V.2 (11/88) (same as H.51)
Power levels for data transmission over telephone lines.
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V.4 (11/88)
General structure of signals of international alphabet No. 5 code for
character oriented data transmission over public telephone networks.
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V.7 (11/88)
Definitions of terms concerning data communication over the telephone
network.
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V.8 (05/99)
Procedures for starting sessions of data transmission over the general
switched telephone network.
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V.8 bis (09/98)
Procedure 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 Voice-Band Modems
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V.10 (03/93) (same as X.26)
Electrical characteristics for unbalanced double-current interchange
circuits operating at data signalling rates nominally up to 100 kbit/s.
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V.11 (10/96) (same as X.27)
Electrical characteristics for balanced double-current interchange
circuits operating at data signalling rates up to 10 Mbit/s.
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V.12 (08/95)
Electrical characteristics for balanced double-current interchange
circuits for interface with data signalling rates up to 52 Mbit/s.
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V.13 (03/93)
Simulated carrier control.
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V.14 (03/93) + Corr 1 (09/98)
Transmission of start-stop characters over synchronous bearer channels.
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V.15 (11/88)
Use of acoustic coupling for data transmission.
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V.16 (11/88)
Medical analogue data transmission modems.
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V.17 (02/91) + Corr 1 (09/98)
A 2-wire modem for facsimile applications with rates up to 14 400 bit/s.
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V.18 (02/98) + Appendix III (09/98) + Appendix IV (09/98)
Operational and interworking requirements for DCEs operating in the
text telephone mode.
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V.19 (11/88)
Modems for parallel data transmission using telephone signalling
frequencies.
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V.21 (11/88)
300 bits per second duplex modem standardized for use in the general
switched telephone network.
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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.
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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.
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V.23 (11/88)
600/1200-baud modem standardized for use in the general switched
telephone network.
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V.24 (02/00)
List of definitions for interchange circuits between data terminal
equipment (DTE) and data circuit-terminating equipment (DCE).
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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.
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V.25 bis (10/96)
Synchronous and asynchronous automatic dialling procedures on switched
networks.
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V.25 ter (07/97) + Annex A (08/96) + Supp (04/95)
Serial asynchronous automatic dialling and control.
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V.26 (11/88)
2400 bits per second modem standardized for use on 4-wire leased
telephone-type circuits.
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V.26 bis (11/88)
2400/1200 bits per second modem standardized for use in the general
switched telephone network.
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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.
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V.27 (11/88)
4800 bits per second modem with manual equalizer standardized for use on
leased telephone-type circuits.
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V.27 bis (11/88)
4800/2400 bits per second modem with automatic equalizer standardized
for use on leased telephone-type circuits.
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V.27 ter (11/88)
4800/2400 bits per second modem standardized for use in the general
switched telephone network.
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V.28 (03/93)
Electrical characteristics for unbalanced double-current interchange
circuits.
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V.29 (11/88)
9600 bits per second modem standardized for use on point-to-point 4-wire
leased telephone-type circuits.
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V.31 (11/88)
Electrical characteristics for single-current interchange circuits
controlled by contact closure.
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V.31 bis (11/88)
Electrical characteristics for single-current interchange circuits using
optocouplers.
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V.32 (03/93)
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.
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V.32 bis (02/91)
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.
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V.33 (11/88)
14 400 bits per second modem standardized for use on point-to-point
4-wire leased telephone-type circuits.
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V.34 (02/98) + Corr (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
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V.36 (11/88)
Modems for synchronous data transmission using 60-108 kHz group band
circuits.
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V.37 (11/88)
Synchronous data transmission at a data signalling rate higher than 72
kbit/s using 60-108 kHz group band circuits.
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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
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V.41 (11/88)
Code-independent error-control system.
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V.42 (10/96)
Error-correcting procedures for DCEs using asynchronous-to-synchronous
conversion.
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V.42 bis (01/90)
Data compression procedures for data circuit-terminating equipment (DCE)
using error correcting procedures.
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V.43 (02/98)
Data Flow Control.
Transmission Quality and Maintenance
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V.50 (11/88)
Standard limits for transmission quality of data transmission.
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V.51 (11/88) (same as M.729)
Organization of the maintenance of international telephone-type circuits
used for data transmission.
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V.52 (1988)
Characteristics of distortion and error-rate measuring apparatus for
data transmission.
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V.53 (11/88)
Limits for the maintenance of telephone-type circuits used for data
transmission.
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V.54 (11/88)
Loop test devices for modems.
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V.55 (11/88) (same as O.71)
Specification for an impulsive noise measuring instrument for
telephone-type circuits.
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V.56 (11/88)
Comparative tests of modems for use over telephone-type circuits.
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V.56 bis (08/95)
Network transmission model for evaluating modem performance over
2-wire voice grade connections.
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V.56 ter (08/96)
Test procedure for evaluation of 2-wire 4 kHz voiceband duplex modems.
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V.57 (1988)
Comprehensive data test set for high data signalling rates.
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V.58 (09/94)
Management information model for V-Series DCEs.
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V.61 (08/96)
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 14 400 bit/s, for use on the general
switched telephone network and on leased point-to-point 2-wire telephone
type circuits.
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V.70 (08/96)
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.
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V.75 (08/96) + Appendix II (02/98)
DSVD terminal control procedures.
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V.76 (08/96)
Generic multiplexer using V.42 LAPM-based procedures.
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V.80 (08/96)
In-band DCE control and synchronous data modes for asynchronous DTE.
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V.90 (09/98)
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.
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V.91 (05/99)
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.
Interworking with Other Networks
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V.100 (11/88)
Interconnection between public data networks (PDNs) and the public
switched telephone networks (PSTN).
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V.110 (02/00) (same as I.463)
Support by an ISDN of data terminal equipments with V-Series type
interfaces.
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V.120 (10/96) (same as I.465) + Corr 1 (05/99)
Support by an ISDN of data terminal equipment with V-Series type
interfaces with provision for statistical multiplexing.
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V.130 (08/95)
ISDN terminal adaptor framework.
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V.140 (02/98)
Procedures for Establishing Communication Between Two Multiprotocol
Audiovisual Terminals Using Digital Channels at a Multiple of 64 or 56
kbit/s.
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V.230 (11/88)
General data communications interface layer 1 specification.
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V.250 (05/99) + Supp 1 (09/98)
Serial Asynchronous Automatic Dialling and Control.
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V.251 (02/98)
Procedure for DTE-Controlled Call Negotiation.
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V.252 (02/98)
Procedure for Control of V.70 and H.324 Terminals by a DTE.
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V.253 (02/98)
Control of Voice-Related Functions in a DCE by an Asynchronous DTE.
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V.300 (07/99)
A 128 (144) kbit/s Data Circuit-Terminating Equipment Standardized for
Use on Digital Point-to-Point Leased Circuit.