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AS H58-1952...
ITU-T Q.702 Signalling data link
ITU-T M.32 Principles for using alarm information for maintenance of international transmission systems and equipment
ITU-T M.34 Performance monitoring on international transmission systems and equipment
ITU-T M.35 Principles concerning line-up and maintenance limits
ITU-T M.70 Guiding principles on the general maintenance organization for telephone-type international circuits
ITU-T M.50 Use of telecommunication terms for maintenance
ITU-T M.320 Numbering of the channels in a group