1、INTERNATIONAL TELECOMMUNICATION UNION)45G134 - TELECOMMUNICATIONSTANDARDIZATION SECTOROF ITU-!).4%.!.#% ).4%2.!4)/.!,G0G04%,%0(/.%G0G0#)2#5)433934%-G0G0!6!),!“),)49G0G0).&/2-!4)/.0/).4)45G134G0G0RecommendationG0G0- (Extract from the “LUEG0“OOK)NOTES1 ITU-T Recommendation M.721 was published in Fasci
2、cle 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 Blue Book version and copyright conditions remain unchanged (see below).2 In this R
3、ecommendation, 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 ormechanic
4、al, including photocopying and microfilm, without permission in writing from the ITU.Fascicle IV.1 - Rec. M.721 1Recommendation M.721Fascicle IV.1 - Rec. M.721SYSTEM AVAILABILITY INFORMATION POINT1 Definition of system availability information pointThe system availability information point is an ele
5、ment within the general maintenance organization for theinternational automatic and semi-automatic telephone service associated with one or more international centres. Itcollects and disseminates information concerning the non-availability of telecommunications systems which affects theinternational
6、 service. The term availability is used here in the broadest sense of the word.2 Responsibilities and functionsThe system availability information point is responsible for the following set of functions:2.1 Collecting information concerning major breakdowns, planned outages, or other special circums
7、tances in thenational and international networks which would materially affect international traffic whether incoming, outgoing ortransit.2.2 Keeping aware of the probable duration of major breakdowns and noting whether the relevant traffic load issuch that service is likely to be affected.2.3 Keepi
8、ng close contact with the restoration control point(s) and assisting in restoration matters.2.4 Collecting information concerning the status of restoration activities related to major failures, and the return tonormal conditions.2.5 Making available information concerning failures and restoration pr
9、ogress to interested parties and othercentres not directly involved in the activities, as appropriate.2.6 Furnishing reports to the operating authorities of abnormal conditions, as required, including progress reportsin connection with prolonged disruptions.2.7 Furnishing major breakdown information
10、 to network management or traffic operating personnel when a majorbreakdown occurs, so that suitable changes may be made in operating procedures.2.8 Notifying other international centres as required, through the approriate authorities, of actions taken inconnection with major breakdowns.2.9 Continuo
11、usly observing system conditions and if a situation arises where service disturbances can beminimized with a change in normal procedures, advising the appropriate maintenance unit (e.g. concerningpostponement of a planned outage).3 FacilitiesThe system availability information point should be provid
12、ed with the following facilities:3.1 Appropriate communication facilities in order to assume its responsibilities.3.2 Means to receive, store, have access to, and up-date system availability information.3.3 Access to information concerning the availability of equipment and routes in SPC exchanges, for instance, bymeans of data terminals.
