1、INTERNATIONAL TELECOMMUNICATION UNION)45G134 - TELECOMMUNICATIONSTANDARDIZATION SECTOROF ITU-!).4%.!.#% ).4%2.!4)/.!,G0G04%,%0(/.%G0G0#)2#5)434%34).G0G00/).4G0G0 ,).%3).!,).G9)45G134G0G0RecommendationG0G0- (Extract from the “LUEG0“OOK)NOTES1 ITU-T Recommendation M.718 was published in Fascicle IV.1
2、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 Recommenda
3、tion, 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, inclu
4、ding photocopying and microfilm, without permission in writing from the ITU.Fascicle IV.1 - Rec. M.718 1Recommendation M.718Fascicle IV.1 - Rec. M.718TESTING POINT (LINE SIGNALLING)1 Definition of testing point (line signalling)The testing point (line signalling) is an element within the general mai
5、ntenance organization for theinternational automatic and semi-automatic telephone service at each international centre. It carries out line signallingtests on international circuits using channel-associated signalling systems, e.g. R2, No. 5, whether provided by whollyanalogue transmission and switc
6、hing systems or by a mixture of analogue and digital systems1).2 Responsibilities and functionsThe testing point (line signalling) is responsible for the following set of functions:2.1 Carrying out line signalling tests in connection with the setting-up and lining-up of international circuits.2.2 Ca
7、rrying out routine line signalling tests.2.3 Carrying out diagnostic tests to localize a reported difficulty in line signalling.2.4 Passing details of line signalling problems to the appropriate maintenance unit as necessary and cooperating indetailed fault localization.2.5 Reporting details to the
8、circuit control station, the fault report point (circuit) or the originating fault reportpoint as appropriate of action taken.2.6 Cooperating with staff in other international centres as required.3 FacilitiesThe testing point (line signalling) should be provided with the following facilities:3.1 Acc
9、ess to the circuit access point (for definition of these access points, refer to 2 ofRecommendation M.565).3.2 Access to the line access point (for definition of these access points, refer to 2 of Recommendation M.565).The line access point can be deleted for circuits with simple terminals. Digital
10、circuits are not provided withline access points.3.3 Association of test equipment to the access points to assess the performance of the line signalling entities.3.4 Access to information from the internal and, where provided, external supervisory and testing functions ofSPC exchanges, for instance,
11、 by means of data terminals.3.5 Communication with other points concerned with circuit maintenance and signalling equipment maintenancewithin the same international centre.3.6 Communication with similar points in other international centres to which circuits are routed to enablecooperation to be obt
12、ained and given.3.7 Access to maintenance access lines as described in Recommendation O.11 1.3.8 Access to information from automatic transmission measuring and signalling testing equipment (ATME No. 2)as described in Recommendation O.22 2._1)In practice, at digital international exchanges, a line a
13、ccess point at the circuit level may not exist when the exchange is interfacedby primary (or higher order) digital paths. Thus, all signalling testing may need to be carried out from one location generally thetesting point (switching and interregister signalling). Signalling tests on Signalling Syst
14、ems No. 6 and No. 7 are controlled andcoordinated by the administrative control (see Recommendations M.762 and M.782).2 Fascicle IV.1 - Rec. M.718References1 CCITT Recommendation Maintenance acces lines, Vol. IV, Rec. O.11.2 CCITT Recommendation CCITT automatic transmission measuring and signalling testing equipment ATMENo. 2, Vol. IV, Rec. O.22.
