1、INTERNATIONAL TELECOMMUNICATION UNION)45G134 1 TELECOMMUNICATIONSTANDARDIZATION SECTOROF ITU).4%27/2+).G0G0/&G0G03).!,).G0G03934%-3,/)#G0G002/#%$52%3G0G0&/2G0G0/54/).3).!,).G0G03934%-G0G0.O G0 )45G134G0G0RecommendationG0G01 (Extract from the “LUEG0“OOK)NOTES1 ITU-T Recommendation Q.621 was published
2、 in Fascicle VI.6 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
3、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 means, electronic o
4、rmechanical, including photocopying and microfilm, without permission in writing from the ITU.Fascicle VI.6 - Rec. Q.621 1Recommendation Q.621Fascicle VI.6 - Rec. Q.621LOGIC PROCEDURES FOR OUTGOING SIGNALLING SYSTEM No. 4Supervisory timerst1= 10 - 30 s Recommendation Q.127, 4.4.1 (2), c)t2= 5 - 10 s
5、 Recommendation Q.127, 4.4.1 (2), d)t3= 15 - 30 s Recommendation Q.127, 4.4.1 (2), a)t4= 5 - 10 s Recommendation Q.130, 4.7.1Procedure not shownThe following procedure, not directly relevant to interworking, is not shown in the logic procedures:P1= Procedure for time-out due to non-receipt of release guard (see Recommendation Q.130, 4.7.1).FIGURE 2/Q.621Notes to outgoing Signalling System No. 42 Fascicle VI.6 - Rec. Q.621 Fascicle VI.6 - Rec. Q.621 3 4 Fascicle VI.6 - Rec. Q.621 Fascicle VI.6 - Rec. Q.621 5
