90 lines
4.3 KiB
Plaintext
90 lines
4.3 KiB
Plaintext
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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T T
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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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T T
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H-NET H-NET H-NET H-NET H-NET H-NET H-NET H
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CCITT RECOMENDATIONS
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V series - covering data transmissions over telephone lines
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V1 Equivalence between binary notation stmbols and the significant cond-
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itions of a two conditioned code
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V2 Power levels for data transmission over telephone lines
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V3 International Alphabet No.5 (ASCII)
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V4 General structure of signals of International Alphabet No.5 code for
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data transmissions over public telephone networks
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V5 Standardisation of modulation rates and data signalling rates for
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synchronoous data transmission in general switched network
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V6 Ditto, on leased telephone type circuits
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V7-9 Not assigned
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V10 Electrical characteristics for unbalanced double current interchange
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circuits for general use with integrated circuits
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V11 Ditto, for balanced double current interchange circuits
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V12 Not assigned
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V13 Answerback simulator
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V14 Not assigned
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V15 Use of acoustic coupling for data transmission
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V16 Recommendation for modems for transmission of medical analogue data
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V19 Modems for parallel data transmissions using telephone signalling
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frequencies
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V20 Parallel data transmission modems standardised for universal use in
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the general switched network
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V21 300 Baud modem standardised for use in the switched telephone network
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V22 1200 Baud full duplex 2 wire modem standardised for use in the
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general switched telephone network
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V22b 2400 Baud full duplex 2 wire modem standardised for use in the
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general switched telephone network
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V23 600/1200 baud modem standardised for use in the general switched
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telephone network
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V24 List of definitions for interchange circuits between data terminal
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equipment and data circuit terminating equipment (i.e. modem)
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V25 Automatic calling and/or answering equipment on the general switched
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telephone network
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V25b Bit synchronous auto dialling protocol for use over PSTN
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V26 2400 baud modem for use on 4 wire point to point circuits
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V26b 2400/1200 baud modem standardised for use in the general switched
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telephone network
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V27 4800 baud modem for leased circuits
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V27b 4800/2400 modem with automatic adaptive equaliser standardised for
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use on leased circuits
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V27t 4800/2400 modem standardised for use on the general switched
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telephone network
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V28 Electrical characteristics for unbalanced double current interchange
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circuits
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V29 9600 baud modem for use on leased circuits
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V30 Not assigned
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V31 Electrical characteristics for single current interchange circuits
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controlled by contact closure
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V32-4Not Assigned
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V35 Data transmission at 48 kilobits per second using 60-108KHz group
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band circuits
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V36 Modems for synchronous data transmission using 60-108kHz group band
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circuits
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V37-9Not assigned
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V40 Error indication with electromechanical equipment
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V41 Code independent error correction system
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V42-9Not assigned
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V50 Standard limits for transmission quality of data transmission
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V51 Organisation of the maintenance of international telephone type
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circuits for data transmission
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V52 Characteristics of distortion and error rate measuring apparatus for
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data transmission
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V53 Limits for the maintenance of telephone type circuits used for data
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transmissions
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V54 Loop test device for modems
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V55 Specification for an impulsive noise measuring instrument for
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telephone type circuits
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V56 Comparative test for modems for use over telephone type circuits
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V57 Comprehensive test set for high signalling rates.
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by Zed Haytey 1990
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===============================================================================
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[Hackernet BBS,LEEDS,UK(0532)557739, 24hrs. Home of H-Net Hacking magazine]
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