1、INTERNATIONAL TELECOMMUNICATION UNION)45G134 1 TELECOMMUNICATIONSTANDARDIZATION SECTOROF ITU%.%2!,G0G02%#/-%.$!4)/.3G0G0/.G0G04%,%0(/.%37)4#().G0G0!.$G0G03).!,).).4%2.!4)/.!,G0G0!54/-!4)#G0G0!.$3%-)G13!54/-!4)#G0G07/2+)./)3%G0G0).G0G0!G0G0.!4)/.!,G0G0 G137)2%G0G0!54/-!4)#%8#(!.%)45G134G0G0Recommenda
2、tionG0G01 (Extract from the “LUEG0“OOK)NOTES1 ITU-T Recommendation Q.31 was published in Fascicle VI.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 identi
3、cal to the Blue Book version and copyright conditions remain unchanged (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 thi
4、s publication may be reproduced or utilized in any form or by any means, electronic ormechanical, including photocopying and microfilm, without permission in writing from the ITU.Fascicle VI.1 - Rec. Q,31 1Recommendation Q.31Fascicle VI.1 - Rec. Q,31NOISE IN A NATIONAL 4-WIRE AUTOMATIC EXCHANGEIt is desirable that the requirements concerning noise conditions for a national 4-wire automatic exchange bethe same as for an international exchange (see Recommendation Q.45, 5).
