1、INTERNATIONAL TELECOMMUNICATION UNION)45G134 - TELECOMMUNICATIONSTANDARDIZATION SECTOROF ITU-!).4%.!.#%G0 G0).42/$5#4)/.!.$G0G0%.%2!,G0G002).#)0,%302).#)0,%3G0G0#/.#%2.).G0G0,).%G1350!.$G0G0-!).4%.!.#%G0G0,)-)43)45G134G0G0RecommendationG0G0- (Extract from the “LUEG0“OOK)NOTES1 ITU-T Recommendation M
2、.35 was published in Fascicle IV.1 of the Blue Book. This file is an extract from theBlue 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 unchang
3、ed (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 may be reproduced or utilized in any form or by any me
4、ans, electronic ormechanical, including photocopying and microfilm, without permission in writing from the ITU.Fascicle IV.1 - Rec. M.35 1Recommendation M.35Fascicle IV.1 - Rec. M.35PRINCIPLES CONCERNING LINE-UP AND MAINTENANCE LIMITSThe following principles have been adopted in respect of line-up a
5、nd maintenance action limits for analogueand digital international circuits, links and lines:i) There should be separate limits for line-up and maintenance action.ii) There should be a single limit specified for maintenance action, and this limit should be chosen such that,if exceeded, a fault would
6、 be considered to exist. (However, the subject of prompt and deferredmaintenance action requirements is under study and the result of this study may reflect on the number oflimits required for maintenance action.)iii) After clearance of a fault, an international circuit, link or line should be retur
7、ned to service within theline-up limit or, in the circumstances where this is not practical, as close as possible to the line-up limit. Inall cases, the circuit, link or line should be returned to service within the maintenance action limit.It is intended that, wherever practical, these principles be embodied in new M and N Recommendations, andbe taken into account when the M and N Recommendations have cause to be reviewed or amended.
