ITU-T M 630-1988 MAINTENANCE OF CIRCUITS USING CONTROL CHART METHODS《使用控制图法维护电路》.pdf

INTERNATIONAL TELECOMMUNICATION UNION)45G134 - TELECOMMUNICATIONSTANDARDIZATION SECTOROF ITU-!).4%.!.#% ).4%2.!4)/.!,G0G04%,%0(/.%G0G0#)2#5)43-!).4%.!.#%G0G0/ the saving in manpower; the transference of work from field staff to administrative offices; any observed change in the quality of groups of circuits maintained by sampling methods.Reference1 CCITT Handbook on Quality of service, network management and network maintenance, ITU, Geneva, 1984.