ITU-T Q 118 BIS-1988 Indication of congestion conditions at transit exchanges《异常情况 专门的释放安排》.pdf

1、INTERNATIONAL TELECOMMUNICATION UNION)45G134 1 G0BISTELECOMMUNICATIONSTANDARDIZATION SECTOROF ITU%.%2!,G0G02%#/-%.$!4)/.3G0G0/.G0G04%,%0(/.%37)4#().G0G0!.$G0G03).!,).#,!53%3G0G0!00,)#!“,%G0G04/G0G0)45G134G0G034!.$!2$3934%-3).$)#!4)/.G0G0/&G0G0#/.%34)/.G0G0#/.$)4)/.3!4G0G042!.3)4G0G0%8#(!.%3)45G134G0

2、G0RecommendationG0G01 G0BIS(Extract from the “LUEG0“OOK)NOTES1 ITU-T Recommendation Q.118 bis was published in Fascicle VI.1 of the Blue Book. This file is an extractfrom the Blue Book. While the presentation and layout of the text might be slightly different from the Blue Book version,the contents

3、of the file are identical 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 re

4、served. No part of this 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.118 bis 1Recommendation Q.118 bisFascicle VI.1 - Rec. Q.118 bis4.4 INDICATIO

5、N OF CONGESTION CONDITIONS AT TRANSIT EXCHANGESIn the case of congestion at a transit exchange, the following conditions apply:4.4.1 The busy-flash signal or an equivalent signal shall be returned to indicate that there is equipment congestionin the exchange or that no free outgoing circuit is avail

6、able. This signal shall be returned within the periods specified.In semi-automatic and in automatic working, the receipt of this signal by the international exchange will causethe clear-forward signal to be sent so as to release the international connection and will give a suitable indication to thecalling subscriber or operator, unless an automatic repeat attempt is made.