1、INTERNATIONAL TELECOMMUNICATION UNION)45G134 - TELECOMMUNICATIONSTANDARDIZATION SECTOROF ITU-!).4%.!.#% ).4%2.!4)/.!,G0G04%,%0(/.%G0G0#)2#5)43.%47/2+G0G0!.!,93)3G0G00/).4)45G134G0G0RecommendationG0G0- (Extract from the “LUEG0“OOK)NOTES1 ITU-T Recommendation M.720 was published in Fascicle IV.1 of th
2、e 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 Blue Book version and copyright conditions remain unchanged (see below).2 In this Recommendation,
3、 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 may be reproduced or utilized in any form or by any means, electronic ormechanical, including
4、photocopying and microfilm, without permission in writing from the ITU.Fascicle IV.1 - Rec. M.720 1Recommendation M.720Fascicle IV.1 - Rec. M.720NETWORK ANALYSIS POINT1 Definition of network analysis pointThe network analysis point is an element within the general maintenance organization for the in
5、ternationalautomatic and semi-automatic telephone service associated with one or more international centres.It receives information concerning service quality and faults not associated with specific circuits.It analyses all relevant information to investigate the problems involved. The general consi
6、derations forchecking the quality of the international telephone service are given in Recommendation E.420 1.The network analysis point may request the fault report point (network) to initiate investigatory and/orremedial actions in one or more maintenance centres in the home country or via a fault
7、report point (network) in anothercountry. It acts as a single point of contact for general enquiries concerning the day-to-day maintenance of theinternational telephone network, as may be made by the maintenance organizations of other Administrations.2 Responsibilities and functionsThe network analy
8、sis point is responsible for the following set of functions:2.1 Analysing all fault reports received from the fault report point (network).2.2 Collecting and analysing all information necessary for the evaluation and supervision of the quality of theinternational service and the diagnosis and locali
9、zation of faults reported to it. The following items are recommended forconsideration:a) Call failure information derived from operator and subscriber reports.b) Traffic service observations for preparation of Tables 1/E.422 2 and 1/E.423 3.c) Traffic service observations undertaken for specific pur
10、poses.d) Results of manual and automatic test calls.e) Reports from fault report points (network) of other Administrations and also from maintenance units of itsown Administration.f) Summarized information from group reference pilots.g) Information from automatic supervision of switching equipment.h
11、) Information that all circuits on a route are busy.i) Summarized information from traffic monitoring and accounting equipment.j) Information derived from circuit and circuit group surveillance equipment.k) Periodic data from traffic measuring equipment, e.g. loading in erlangs, percentage occupancy
12、 andoverflow intensities.2.3 Analysing summaries of transmission measurements that may be received from maintenance units of its ownAdministration.2.4 Receiving information concerning major breakdowns affecting the international telephone service andevaluating their effect with respect to network co
13、ndition.2.5 Receiving reports of all events likely to affect the international telephone service.2.6 Analysing out-of-service times and cooperating with the maintenance units in their efforts to reduce such timesto a minimum.2.7 Making optimum use of statistical methods (e.g. trouble pattern techniq
14、ues) for determining the probablelocation of failure points.2 Fascicle IV.1 - Rec. M.7202.8 Cooperation with the network analysis points of other countries in order to coodinate action in case of servicedefects existing in the part of the network depending on those points.2.9 Employing information c
15、oncerning routing, signalling, switching, and transmission systems in its country andother countries to help locate and clear impediments to good service.2.10 Advising the fault report point (network) of the results of its analyses as necessary.2.11 Receiving general enquiries concerning the mainten
16、ance of the international telephone network from otherAdministrations, and answering such enquiries or undertaking any necessary analyses or investigations.3 FacilitiesThe network analysis point should be provided with the following facilities:3.1 Appropriate communication facilities in order to ass
17、ume its responsibilities.3.2 Access to information from the internal and, where provided, external supervisory and statistical functionsof SPC-exchanges, for instance, by means of data terminals.3.3 Means to receive and process information associated with the functions listed above.3.4 Means of stor
18、ing received and processed information.3.5 Means of accessing stored information.References1 CCITT Recommendation Checking the quality of the international service, Vol. II, Rec. E.420.2 CCITT Recommendation Observations on international outgoing telephone calls for quality of service, Vol. II,Table 1/E.422 of Rec. E.422.3 CCITT Recommendation Observations on traffic set up by operators, Vol. II, Table 1/E.423 of Rec. E.423.
