ITU-T M 717-1988 TESTING POINT (TRANSMISSION)《测试点(传输)》.pdf

1、INTERNATIONAL TELECOMMUNICATION UNION)45G134 - TELECOMMUNICATIONSTANDARDIZATION SECTOROF ITU-!).4%.!.#% ).4%2.!4)/.!,G0G04%,%0(/.%G0G0#)2#5)434%34).G0G00/).4G0G0 42!.3-)33)/.G9)45G134G0G0RecommendationG0G0- (Extract from the “LUEG0“OOK)NOTES1 ITU-T Recommendation M.717 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 Recommend

3、ation, 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, incl

4、uding photocopying and microfilm, without permission in writing from the ITU.Fascicle IV.1 - Rec. M.717 1Recommendation M.717Fascicle IV.1 - Rec. M.717TESTING POINT (TRANSMISSION)1 Definition of testing point (transmission)The testing point (transmission) is an element within the general maintenance

5、 organization for the internationalautomatic and semi-automatic telephone service at each international centre. It carries out transmission testing oninternational circuits whether provided by wholly analogue transmission and switching systems or by a mixture ofanalogue and digital systems.2 Respons

6、ibilities and functionsThe testing point (transmission) is responsible for the following set of functions:2.1 Carrying out transmission measurements in connection with the setting-up and lining-up of internationalcircuits.2.2 Carrying out routine transmission tests.2.3 Diagnostic testing on receipt

7、of fault indications.2.4 Passing details of the location of faults to the appropriate maintenance unit and cooperating as necessary indetailed fault localization.2.5 Advising the circuit control or the sub-control station and the fault report point (circuit) of any difficultiesdetected by routine te

8、sts and the action taken in progressing the clearance of faults.2.6 Cooperating with staff in other international centres as required.3 FacilitiesThe testing point (transmission) should be provided with the following facilities:3.1 Access to the circuit access point (for definition of these access p

9、oints, 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)1).3.3 Test equipment for lining-up, fault localization and routine testing of the following type of circuits: analogue; mixed analogue/digital; di

10、gital.Note 1 For definition of the circuits, see Recommendation M.560.Note 2 Routine tests can be omitted if the supervision functions built into the transmission and switchingequipment provide sufficient indication of the overall performance.3.4 Association of test equipment to the access points so

11、 that all transmission parameters specified for the circuitsconcerned may be measured.3.5 Communication to the circuit control station and other points concerned with circuit maintenance within thesame international centre.3.6 Communication to similar points in other international centres to which circuits are routed to enablecooperation to be obtained and given._1)In practice, at digital exchanges, a line access point at circuit level may not exist when the exchange is interfaced by primary (orhigher order) digital paths.For digital circuits, reference should be made to Recommendation M.565.