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H-Net Magazine Vol 1 Issue 1 File 11
H-NET H-NET H-NET H-NET H-NET H-NET H-NET H
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E ** H-Net Magazine ** E
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H Volume One, Issue 1, File #11 of 20 H
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E CCITT Recommendations by Zed Haytey. E
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H-NET H-NET H-NET H-NET H-NET H-NET H-NET H
CCITT RECOMENDATIONS
V series - covering data transmissions over telephone lines
V1 Equivalence between binary notation stmbols and the significant cond-
itions of a two conditioned code
V2 Power levels for data transmission over telephone lines
V3 International Alphabet No.5 (ASCII)
V4 General structure of signals of International Alphabet No.5 code for
data transmissions over public telephone networks
V5 Standardisation of modulation rates and data signalling rates for
synchronoous data transmission in general switched network
V6 Ditto, on leased telephone type circuits
V7-9 Not assigned
V10 Electrical characteristics for unbalanced double current interchange
circuits for general use with integrated circuits
V11 Ditto, for balanced double current interchange circuits
V12 Not assigned
V13 Answerback simulator
V14 Not assigned
V15 Use of acoustic coupling for data transmission
V16 Recommendation for modems for transmission of medical analogue data
V19 Modems for parallel data transmissions using telephone signalling
frequencies
V20 Parallel data transmission modems standardised for universal use in
the general switched network
V21 300 Baud modem standardised for use in the switched telephone network
V22 1200 Baud full duplex 2 wire modem standardised for use in the
general switched telephone network
V22b 2400 Baud full duplex 2 wire modem standardised for use in the
general switched telephone network
V23 600/1200 baud modem standardised for use in the general switched
telephone network
V24 List of definitions for interchange circuits between data terminal
equipment and data circuit terminating equipment (i.e. modem)
V25 Automatic calling and/or answering equipment on the general switched
telephone network
V25b Bit synchronous auto dialling protocol for use over PSTN
V26 2400 baud modem for use on 4 wire point to point circuits
V26b 2400/1200 baud modem standardised for use in the general switched
telephone network
V27 4800 baud modem for leased circuits
V27b 4800/2400 modem with automatic adaptive equaliser standardised for
use on leased circuits
V27t 4800/2400 modem standardised for use on the general switched
telephone network
V28 Electrical characteristics for unbalanced double current interchange
circuits
V29 9600 baud modem for use on leased circuits
V30 Not assigned
V31 Electrical characteristics for single current interchange circuits
controlled by contact closure
V32-4Not Assigned
V35 Data transmission at 48 kilobits per second using 60-108KHz group
band circuits
V36 Modems for synchronous data transmission using 60-108kHz group band
circuits
V37-9Not assigned
V40 Error indication with electromechanical equipment
V41 Code independent error correction system
V42-9Not assigned
V50 Standard limits for transmission quality of data transmission
V51 Organisation of the maintenance of international telephone type
circuits for data transmission
V52 Characteristics of distortion and error rate measuring apparatus for
data transmission
V53 Limits for the maintenance of telephone type circuits used for data
transmissions
V54 Loop test device for modems
V55 Specification for an impulsive noise measuring instrument for
telephone type circuits
V56 Comparative test for modems for use over telephone type circuits
V57 Comprehensive test set for high signalling rates.
by Zed Haytey 1990
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