1、INTERNATIONAL TELECOMMUNICATION UNION)45G134 - TELECOMMUNICATIONSTANDARDIZATION SECTOROF ITU-!).4%.!.#% ).4%2.!4)/.!,G0G04%,%0(/.%G0G0#)2#5)43-!).4%.!.#%G0G0/2!.):!4)/.&/2G0G04(%G0G07(/,9G0G0$)4!,).4%2.!4)/.!,G0G0!54/-!4)#!.$G0G03%-)G13!54/-!4)#4%,%0(/.%G0G03%26)#%)45G134G0G0RecommendationG0G0- (Ext
2、ract from the “LUEG0“OOK)NOTES1 ITU-T Recommendation M.726 was published in Fascicle IV.1 of the Blue Book. This file is an extract fromthe Blue Book. While the presentation and layout of the text might be slightly different from the Blue Book version, thecontents of the file are identical to the Bl
3、ue Book version and copyright conditions remain unchanged (see below).2 In this Recommendation, the expression “Administration” is used for conciseness to indicate both atelecommunication administration and a recognized operating agency. ITU 1988, 1993All rights reserved. No part of this publication
4、 may be reproduced or utilized in any form or by any means, electronic ormechanical, including photocopying and microfilm, without permission in writing from the ITU.Fascicle IV.1 - Rec. M.726 1Recommendation M.726Fascicle IV.1 - Rec. M.726MAINTENANCE ORGANIZATION FOR THE WHOLLY DIGITAL INTERNATIONA
5、LAUTOMATIC AND SEMI-AUTOMATIC TELEPHONE SERVICEThe recommended maintenance organization for a wholly digital international telephone service is under studyby Study Group IV. The detailed development of such an organization cannot be undertaken until such time asAdministrations have gained sufficient
6、 experience of the operation and maintenance of digital transmission andswitching systems these systems being relatively few in number in the international network at present. However,based on present knowledge and experience, Study Group IV intends that the maintenance organization for the fullydig
7、ital international telephone service be based on the following principles and concepts: That there be a gradual evolution of the current maintenance organization (which is intended to cover thewholly analogue and mixed analogue/digital situations) towards the organization suitable for the whollydigi
8、tal network. The rate of this evolution will reflect the rate of introduction of digital systems in theinternational and national networks.According to this principle, it is recognized that, in the transition from a wholly analogue to a whollydigital network, the maintenance organization of a partic
9、ular international centre may be responsible forwholly analogue, wholly digital and mixed analogue/digital circuits since the three types may beterminated at a single international centre. That the “element” approach to defining a maintenance organization, as currently used inRecommendations M.710 t
10、o M.725, be used to define future maintenance organizations.By the intended adoption of this concept it is recognized that the maintenance element approach offers themeans of specifying a maintenance organization which can meet the needs of all Administrations,irrespective of the number of internati
11、onal circuits and international switching centres they operate.In accordance with the current Study Group IV practice, significant national trends in the area of maintenanceorganization (for example, the trend towards increased centralization of maintenance) should be reflected in theSeries M Recommendations where appropriate.
