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ITU-T M.495 Transmission restoration and transmission route diversity: Terminology and general principles
ITU-T M.496 Functional organization for automatic transmission restoration
ITU-T M.500 Routine maintenance measurements to be made on regulated line sections
ITU-T M.520 Routine maintenance on international group, supergroup, etc., links
ITU-T M.510 Readjustment to the nominal value of a regulated line section (on a symmetric pair line, a coaxial line or a radio-relay link)
ITU-T M.525 Automatic maintenance procedures for international group, supergroup, etc., links
ITU-T M.530 Readjustment to the nominal value of an international group, supergroup, etc., link
ITU-T M.535 Special maintenance procedures for multiple destination, unidirectional (MU) group and supergroup links
ITU-T M.540 Routine maintenance of carrier and pilot generating equipment
ITU-T M.556 Setting up and initial testing of digital channels on an international digital path or block
ITU-T M.560 International telephone circuits - Principles, definitions and relative transmission levels
ITU-T M.562 Types of circuit and circuit section