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ITU-T S.12 Conditions that must be satisfied by synchronous systems operating in connection with standard 50-baud teleprinter circuits
ITU-T Q.117 Alarms for technical staff and arrangements in case of faults
ITU-T R.75 Maintenance measurements on code-independent international sections of international telegraph circuits
ITU-T K.9 Protection of telecommunication staff and plant against a large earth potential due to a neighbouring electric traction line
ITU-T Q.26 Direct access to the international network from the national network
ITU-T G.802 Interworking between networks based on different digital hierarchies and speech encoding laws
ITU-T R.4 Methods for the separate measurements of the degrees of various types of telegraph distortion
ITU-T S.18 Conversion between International Telegraph Alphabet No. 2 and International Alphabet No. 5
ITU-T P Supplement 16 Guidelines for placement of microphones and loudspeakers in telephone conference rooms and for group audio terminals (GATs)
ITU-T N.12 Measurements to be made during the line-up period that precedes a sound-programme transmission