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"v.huh?"  v.stuff explained.

By: Bradford W. Liedel

   The following chart references all the v-dot's, what they are, when they were set as a standard, and what they do.  The information is drawn from ITU's website at http://www.itu.int/itudoc/itu-t/rec/v/index.html

56k Protocols

Protocol Date Set as Standard Description
k56flex Never set as a standard A protocol designed for the "56k standards war" by Rockwell Semiconductors and Lucent Technologies.
x2 Never set as a standard A protocol designed for the "56k standards war" by USRobotics (now 3COM).
v.90 09/98 The protocol that was set as standard for achieving connection speeds up to 56,000bps for use with general switched telephone networks and leased point to point two wire telephone circuits

Coding, Symbol Rate, and Power Level Description Protocols for Modems

Protocol Date Set as Standard Description
v.1 11/88 Equivalence between binary notation symbols and the significant conditions of a two-condition code
v.2 11/88 Power levels for data transmission over telephone lines
v.4 11/88 General structure of signals of International Alphabet No. 5 code for character oriented data transmission over public telephone networks
v.7 11/88 Definitions of terms concerning data communication over the telephone network
v.8 05/99 Procedures for starting sessions of data transmission over the public switched telephone network
v.8bis 09/98 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 ......

Interface/Modulation Standards over Voice Frequency Telephone Lines for Modems (Pt.1)

Protocol Date Set as Standard Description
v.10 03/93 Electrical characteristics for unbalanced double-current interchange circuits operating at data signalling rates nominally up to 100 kbit/s
v.11 10/96 Electrical characteristics for balanced double-current interchange circuits operating at data signalling rates up to 10 Mbit/s
v.12 08/95 Electrical characteristics for balanced double-current interchange circuits for interfaces with data signalling rates up to 52 Mbit/s
v.13 03/93 Simulated carrier control
v.14 03/93 Transmission of start-stop characters over synchronous bearer channels
v.14 Corr.1 09/98 Transmission of start-stop characters over synchronous bearer channels - Corrigendum 1
v.15 11/88 Use of acoustic coupling for data transmission
v.16 11/88 Medical analogue data transmission modems
v.17 02/91 A 2-wire modem for facsimile applications with rates up to 14 400 bit/s
v.17 Corr.1 09/98 A 2-wire modem for facsimile applications with rates up to 14 400 bit/s - Corrigendum 1
v.18 02/98 Recommendation V.18 (02/98) - Operational and interworking requirements for DCEs operating in the text telephone mode
v.18 App.3 09/98 Connection procedures for terminals including V.18 functionality
v.18 App.4 09/98 Specification of V.18 implementation tests
v.19 11/88 Modems for parallel data transmission using telephone signalling frequencies
v.21 11/88 300 bits per second duplex modem standardized for use in the general switched telephone network
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
v.22bis 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
v.23 11/88 600/1200-baud modem standardized for use in the general switched telephone network
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 ...

Interface/Modulation Standards over Voice Frequency Telephone Lines for Modems (Pt.2)

Protocol Date Set as Standard Description
v.25bis 10/96 Synchronous and asynchronous automatic dailling procedures on switched networks
v.25ter 07/97 Serial asynchronous automatic dialling and control
v.25ter An A 08/96 Annex A: Procedure for DTE-controlled call negotiation
v.25ter Supp. 04/95 Serial asynchronous automatic dialling and control
v.26 11/88 2400 bits per second modem standardized for use on 4-wire leased telephone-type circuits
v.26bis 11/88 2400/1200 bits per second modem standardized for use in the general switched telephone network
v.26ter 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
v.27 11/88 4800 bits per second modem with manual equalizer standardized for use on leased telephone-type circuits
v.27bis 11/88 4800/2400 bits per second modem with automatic equalizer standardized for use on leased telephone-type circuits
v.27ter 11/88 4800/2400 bits per second modem standardized for use in the general switched telephone network
v.28 03/93 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
v.31 11/88 Electrical characteristics for single-current interchange circuits controlled by contact closure
v.31bis 11/88 Electrical characteristics for single-current interchange circuits using optocouplers
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
v.32bis 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 circuit
v.33 11/88 14 400 bits per second modem standardized for use on point-to-point 4-wire leased telephone-type circuits
v.34 02/98 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.34 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 Modem Signal Convention Standards

Protocol Date Set as Standard Description
v.36 11/88 Modems for synchronous data transmission using 60-108 kHz group band circuits
v.37 11/88 Synchronous data transmission at a data signalling rate higher than 72 kbit/s using 60-108 kHz group band circuits
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 Convention Standards

Protocol Date Set as Standard Description
v.41 11/88 Code-independent error-control system
v.42 10/96 Error-correcting procedures for DCEs using asynchronous-to-synchronous conversion
v.42bis 01/90 Data compression procedures for data circuit terminating equipment (DCE) using error correction procedures
v.43 02/98 Data flow control

Noise Measurement and Testing Methods Specifications

Protocol Date Set as Standard Description
v.50 11/88 Standard limits for transmission quality of data transmission
v.51 11/88 Oroganization of the maintenance of international telephone-type circuits used for data transmission
v.53 11/88 Limits for the maintenance of telephone-type circuits used for data transmission
v.54 11/88 Loop test devices for modems
v.55 11/88 Specification for an impulsive noise measuring instrument for telephone-type circuits
v.56 11/88 Comparative tests of modems for use over telephone-type circuits
v.56bis 08/95 Network transmission model for evaluating modem performance over 2-wire voice grade connections
v.56ter 08/96 Test patterns for evaluation of 2-wire 4-kHz voiceband duplex modems
v.58 09/94 Management information model for V-Series DCEs
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 ...
v.70 08/96 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 08/96 DSVD terminal control procedures
v.75 App.2 02/98 DSVD terminal control procedures: Session establishment using V.75/H.245 procedures
v.76 08/96 Generic multiplexer using V.42 LAPM-based procedures
v.80 08/96 In-band DCE control and synchronous data modes for asynchronous DTE
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
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

Internetworking Specifications (Includes ISDN)

Protocol Date Set as Standard Description
v.100 11/88 Interconnection between public data networks (PDNs) and the public switched telephone networks (PSTN)
v.110 10/96 Support by an ISDN of data terminal equipments with V-Series type interfaces
v.120 10/96 Support by an ISDN of data terminal equipment with V-series type interfaces with provision for statistical multiplexing
v.120 Corr.1 05/99 Support by an ISDN of data terminal equipment with V-series type interfaces with provision for statistical multiplexing
v.130 08/95 ISDN terminal adaptor framework
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
v.230 11/88 General data communications interface layer 1 specification
v.250 05/99 Serial asynchronous automatic dialling and control
v.250 Supp.1 09/98 Serial asynchronous automatic dialling and control - Supplement 1: Various extensions to V.250 basic command set
v.251 02/98 Procedure for DTE-controlled call negociation
v.252 02/98 Procedure for control of V.70 and H.324 terminals by a DTE
v.253 02/98 Control of voice-related functions in a DCE by an asynchronous DTE
v.300 07/99 A 128 (144) kbit/s data circuit-terminating equipment standardized for use on digital point-to-point leased circuit





This page was last modified on Saturday, 05-Feb-2011 15:10:48 EST.




 
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