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ITU-T R.4
ITU-T R.4 Methods for the separate measurements of the degrees of various types of telegraph distortion
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ITU-T G.802
ITU-T G.802 Interworking between networks based on different digital hierarchies and speech encoding laws
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ITU-T S.18
ITU-T S.18 Conversion between International Telegraph Alphabet No. 2 and International Alphabet No. 5
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ITU-T P Supplement 16
ITU-T P Supplement 16 Guidelines for placement of microphones and loudspeakers in telephone conference rooms and for group audio terminals (GATs)
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ITU-T G.711
ITU-T G.711 Pulse code modulation (PCM) of voice frequencies
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ITU-T N.12
ITU-T N.12 Measurements to be made during the line-up period that precedes a sound-programme transmission
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ITU-T I.231.4
ITU-T I.231.4 Circuit-mode bearer service categories : Circuit-mode, alternate speech / 64 kbit/s unrestricted, 8 kHz structured bearer service
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ITU-T O.42
ITU-T O.42 Equipment to measure nonlinear distortion using the 4-tone intermodulation method
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ITU-T R.79
ITU-T R.79 Automatic tests of transmission quality on telegraph circuits between switching centres
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ITU-T K.23
ITU-T K.23 Types of induced noise and description of noise voltage parameters for ISDN basic user networks
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ITU-T Q.32
ITU-T Q.32 Reduction of the risk of instability by switching means
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ITU-T G.950
ITU-T G.950 General considerations on digital line systems
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