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ITU-T Q.683
ITU-T Q.683 Logic procedures for interworking of signalling system R2 to No. 6
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ITU-T Q.684
ITU-T Q.684 Logic procedures for interworking of signalling system R2 to No. 7 (TUP)
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ITU-T Q.685
ITU-T Q.685 Logic procedures for interworking of signalling system R2 to R1
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ITU-T Q.1001
ITU-T Q.1001 General aspects of public land mobile networks
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ITU-T X.4
ITU-T X.4 General structure of signals of International Alphabet No. 5 code for character oriented data transmission over public data networks
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ITU-T X.20
ITU-T X.20 Interface between data terminal equipment (DTE) and data circuit-terminating equipment (DCE) for start-stop transmission services on public data networks
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ITU-T X.20bis
ITU-T X.20bis Use on public data networks of data terminal equipment (DTE) which is designed for interfacing to asynchronous duplex V-series modems
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ITU-T X.21bis
ITU-T X.21bis Use on public data networks of data terminal equipment (DTE) which is designed for interfacing to synchronous V-series modems
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ITU-T X.22
ITU-T X.22 Multiplex DTE/DCE interface for user classes 3-6
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ITU-T X.24
ITU-T X.24 List of definitions for interchange circuits between data terminal equipment (DTE) and data circuit-terminating equipment (DCE) on public data networks
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ITU-T X.219
ITU-T X.219 Remote operations: model, notation and service definition
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ITU-T X.228
ITU-T X.228 Reliable transfer: protocol specification
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