1、 STD-ITU-T RECMN S-3b-ENGL L77b m 48b257L Ob20752 78T m INTERNATIONAL TELECOMMUNICATION UNION ITU-T TELECOMMUNICATION STANDARDIZATION SECTOR OF ITU SERIES S: TELEGRAPH SERVICES TERMINAL EQUIPMENT Start-stop terminals S.36 (07/96) INTEX and similar services - Terminal requirements to effect interwor
2、king between terminals operating at different speeds . ITU-T Recommendation S.36 (Previously “CCIlT Recommendation”) - STD-ITU-T RECMN S-3b-ENGL L99b 48b259L Ob20953 bLb FOREWORD The IT-T (Telecommunication Standardization Sector) is a permanent organ of the International Telecommunication Union (IT
3、U). The ITU-T is responsible for studying technical, operating and tariff questions and issuing Recommen- dations on them with a view to standardizing telecommunications on a worldwide basis. The World Telecommunication Standardization Conference (WTSC), which meets every four years, establishes the
4、 topics for study by the -T Study Groups which, in their turn, produce Recommendations on these topics. The approval of Recommendations by the Members of the IT-T is covered by the procedure laid down in WTSC Resolution No. 1 (Helsinki, March 1-12, 1993). IT-T Recommendation S.36 was prepared by ITU
5、T Study Group 1 (1993-1996) and was approved under the WTSC Resolution No. 1 procedure on the 19th of July 1996. NOTE In this Recommendation, the expression “Administration” is used for conciseness to indicate both a telecommunication administration and a recognized operating agency. O ITU 1996 All
6、 rights reserved. No part of this publication may be reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying and microfilm. without permission in writing from the ITU. CONTENTS Page 1 Introduction 1 2 References 1 3 Principles of operation 1 . Recommendat
7、ion S.36 (07/96) 1 STD-ITU-T RECMN S-3b-ENGL L77b qBb257L Ob20755 477 SUMMARY This Recommendation describes the requirements to be met by terminais participating in the INTEX service in order to allow interworking between terminais which may be operating at different information transfer rates. 11 R
8、ecommendation S.36 (07B6) Recommendation S.36 INTEX) AND SIMILAR SERVICES - TERMINAL REQUIREMENTS TO EFFECT INTERWORKING BETWEEN TERMINALS OPERATING AT DIFFERENT SPEEDS (Geneva, 1996) 1 Introduction This Recommendation describes the requirements to be met by terminals participating in the INTEX serv
9、ice in order to allow interworking between terminals which may be operating at different information transfer rates. 2 References The following Recommendations and other references contain provisions which, through reference in this text, constitute provisions of this Recommendation. At the time of
10、publication, the editions indicated were valid. All Recommendations and other references are subject to revision: all users of this Recommendation are therefore encouraged to investigate the possibility of applying the most recent edition of the Recommendations and other references listed below. A l
11、ist of the currently valid ITU-T Recommendations is regularly published. - - CCIIT Recommendation F. 150 (1991), Service und operational provision for the intex service. CCITT Recommendation F.82 (1991). Operational provisions to permit interworking berween the international telex service and the in
12、tex service. ITU-T Recommendation S.33 (1993). Alphabets and presentation characteristics for the intex service. IT-T Recommendation S.34 (1993), Intex terminals - Requirements to effect interworking with the intemational telex service. -T Recommendation S.35 (1993), Answerback codingfor the intex.
13、ITU-T Recommendation U.102 (1996), Intex and similar services - Nerwork requirements to effect interworking between terminals operating at different speeds. ITU-T Recommendation U.210 (1993), Intex service network requirements to efSect interworking with international telex service. - - - - - 3 Prin
14、ciples of operation 3.1 When a call is established between two terminals of the INTEX service which operate at different transmission rates, the faster terminal shall align the rate at which it transmits characters to the network to that of the slower terminal. 3.2 The terminal operating at the high
15、er transmission rate shall determine that it is connected to a terminal of a lower transmission rate by examination of the Speed Indicator sequence received from the network at call set-up in accordance with Recommendation U. 102. These Speed Indicator sequences are detailed in Table 1 below. Provis
16、ional name (see Recommendation F. 150). Recommendation S.36 (07/96) 1 STDWITU-T RECMN S.3b-ENGL l99b W 4Bb2571 Ob20757 2bl D Speed indicator sequence number 1 2 3 4 TABLE M.36 Speed indicator sequences Character structure 1 2 3 4 Significance 1/11 1/3 1/2 111 300 bitdseccall 1/11 1/3 1/7 1/1 600 bitdseccall 1/11 1/3 1/8 1/1 1200bitdseccall 1/11 1/3 1/13 111 2400 bitdseccail 2 Recommendation S.36 (07/96) Printed in Switzerland Geneva, 1996
