ITU-T M 820-1988 Periodicity of routine tests on international voice-frequency telegraph links《国际音频电报链路例行测试的周期》.pdf

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1、INTERNATIONAL TELECOMMUNICATION UNION)45G134 - TELECOMMUNICATIONSTANDARDIZATION SECTOROF ITU-!).4%.!.#% ).4%2.!4)/.!,G0G04%,%2!0(G0G03934%-3!.$G0G00(/4/4%,%2!0(G0G042!.3-)33)/.0%2)/$)#)49G0G0/ thismakes it easier to carry out the measurements on the voice-frequency telegraph circuits.6 The periodici

2、ty of measurements on telephone circuits used as reserve circuits is as given inTable 1/M.610 2.For circuits providing reserve sections for an international voice-frequency telegraph link the periodicity ofroutine measurements will be agreed upon between the Administrations concerned.7 A check shoul

3、d be made when suitable opportunities occur, to see that the limits shown in Tables A-1/M.810,A-2/M.810 and A-3/M.810 for the permissible power per telegraph channel are not exceeded.References1 CCITT Recommendation Periodicity of maintenance measurements on circuits, Vol. IV, Rec. M.610.2 Ibid., Table 1/M.610.