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BS PD CEN ISO/TR 20659‑2:2024
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ITU-T Q.725
ITU-T Q.725 Signalling performance in the telephone application
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ITU-T Q.755
ITU-T Q.755 Signalling system no. 7 - Protocol tests
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ITU-T Q.1112
ITU-T Q.1112 Procedures for interworking between INMARSAT standard-B system and the international public switched telephone network/ISDN
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ITU-T Q.1400
ITU-T Q.1400 Architecture framework for the development of signalling and OA&M protocols using OSI concepts
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ITU-T R.5
ITU-T R.5 Observation conditions recommended for routine distortion measurements on international telegraph circuits
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ITU-T R.9
ITU-T R.9 How the laws governing distribution of distortion should be arrived at
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ITU-T R.54
ITU-T R.54 Conventional degree of distortion tolerable for standardized start-stop 50-baud systems
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ITU-T R.56
ITU-T R.56 Telegraph distortion limits to be quoted in recommendations for equipment and transmission plans
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ITU-T R.118
ITU-T R.118 Performance and availability monitoring in regenerative TDM
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ITU-T S.8
ITU-T S.8 Intercontinental standardization of the modulation rate of start-stop apparatus and of the use of combination No. 4 in figure-shift
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ITU-T S.20
ITU-T S.20 Automatic clearing procedure for a telex terminal
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ITU-T S.21
ITU-T S.21 Use of display screens in telex machines
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