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FORD WSK-M11P57-A2 2000...
ITU-T M.605 Routine maintenance schedule for international public telephony circuits
ITU-T M.610 Periodicity of maintenance measurements on circuits
ITU-T M.620 Methods for carrying out routine measurements on circuits
ITU-T M.630 Maintenance of circuits using control chart methods
ITU-T M.650 Routine line measurements to be made on the line repeaters of audio-frequency sections or circuits
ITU-T M.660 Periodical in-station tests of echo suppressors complying with Recommendations G.161 and G.164
ITU-T M.670 Maintenance of a circuit fitted with a compandor
ITU-T M.675 Lining up and maintaining international demand assignment circuits (SPADE)
ITU-T M.710 General maintenance organization for the international automatic and semi-automatic telephone service