ITU-T M 830-1988 Routine measurements to be made on international voice-frequency telegraph links《国际音频电报链路上进行的例行测量》.pdf

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1、INTERNATIONAL TELECOMMUNICATION UNION)45G134 - TELECOMMUNICATIONSTANDARDIZATION SECTOROF ITU-!).4%.!.#% ).4%2.!4)/.!,G0G04%,%2!0(G0G03934%-3!.$G0G00(/4/4%,%2!0(G0G042!.3-)33)/.2/54).%G0G0-%!352%-%.434/G0G0“%G0G0-!$%G0G0/.G0G0).4%2.!4)/.!,6/)#%G13 circuits providing a 24-channel telegraph system: 300

2、, 400, 600, 800, 1020, 1400, 1900, 2400, 3000,3200, 3400 Hz.2 If the nominal overall loss/frequency distortion exceeds the limits given in Recommendation M.810, any faultsexisting should first be removed, and the link should then be readjusted to within the limits given in RecommendationM.810.3 Weighted and unweighted noise measurements should be made on the voice-frequency telegraph link at thetime of the routine measurements of level as given in Recommendation M.820.