ISO/IEC INTERNATIONAL STANDARD 8327-1 Second edition 1996-09-15 Information technology Open Systems Interconnection Connection-oriented Session protocol: Protocol specification Technologies de I'information-Interconnexion de systemes ouverts (Osl)-Protocolede session enmode oriente connexion:Spécification du protocole tso E( Reference number ISO/IEC 8327-1:1996(E) ISO/IEC 8327-1:1996(E) Contents Page SECTION1 .GENERAI 1 1 Scope 1 2 Normative references... 1 2.1 Identical Recommendations I International Standards... 1 2.2 Paired Recommendations I International Standards equivalent in technical content. 2 2.3 AdditionalReferences.. 2 3 Definitions. 2 3.4 Session protocol definitions . 3 4 Abbreviations . 4 4.1 Data units 4 4.2 SPDU fields . 4 4.3 Timer variables 4 4.4 Miscellaneous ... 4 4.5 Local variables.... 5 Overview of the session protocol.. 5 5 5.1 Model of the session layer ... 5 5.2 Services provided by the session layer 6 5.3 Services assumed from the transport layer. 7 5.4 Functions of the session layer . 7 5.5 Protocol version numbers . 9 5.6 Functional units... 9 5.7 Tokens.. 12 5.8 Negotiation... 13 5.9 Local variables ... 14 SECTION 2 SESSION PROTOCOL SPECIFICATION.. 16 一 6 Use of the transport service.. 16 6.1 Assignment of a session connection to the transport connection.. 16 6.2 Reuse of the transport connection.... 17 6.3 Use of transport normal data.. 17 6.4 Use of transport expedited data... 22 6.5 Flow contro... 22 6.6 Transport disconnection... 22 @ISO/IEC1996 All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized inanyform or byanymeans,electronic or mechanical,including photocopying and micro film, without permission in writing from the publisher. ISO/IEC Copyright Office· Case postale 56·CH-1211 Geneve 20· Switzerland Printed in Switzerland ii @ ISO/IEC ISO/IEC 8327-1:1996(E) 7 Elements of procedure related to SPDUs. 23 7.1 23 7.2 25 7.3 CONNECT DATA OVERFLOW SPDU 25 7.4 ACCEPT. SPDU.. 25 7.5 REFUSE SPDU .. 28 7.6 FINISH SPDU ... 28 7.7 DISCONNECT SPDU.... 29 7.8 NOT FINISHED SPDU.. 29 7.9 ABORT SPDU... 30 7.10 ABORT ACCEPT SPDU... 31 7.11 DATA TRANSFER SPDU.. 32 7.11.1 Content of DATA TRANSFER SPDU.... 32 7.11.2 32 7.11.3 Receiving the DATA TRANSFER SPDU. 32 7.12 33 7.12.1 Content of EXPEDITED SPDU 33 7.12.2 Sending the EXPEDITED SPDU .... 33 7.12.3 Receiving the EXPEDITED SPDU ... 33 7.13 TYPEDDATA SPDU.. 33 7.13.1 Content of TYPED DATA SPDU .. 33 7.13.2 Sending the TYPED DATA SPDU .. 34 7.13.3 Receiving the TYPED DATA SPDU .... 34 7.14 CAPABILITY DATA SPDU.. 34 7.14.1 Content of CAPABILITY DATA SPDU... 34 7.14.2 Sending the CAPABILITY DATA SPDU... 34 7.14.3 Receiving the CAPABILITY DATA SPDU.. 34 7.15 CAPABILITY DATA ACK SPDU.... 34 7.15.1 Content of CAPABILITY DATA ACK SPDU ... 34 7.15.2 Sending the CAPABILITY DATA ACK SPDU ... 34 7.15.3 Receiving the CAPABILITY DATA ACK SPDU 35 7.16 GIVE TOKENS SPDU.... 35 7.16.1 35 7.16.2 Sending the GIVE TOKENS SPDU. 35 7.16.3 Receiving the GIVE TOKENS SPDU 35 7.17 PLEASE TOKENS SPDU. 35 7.17.1 Content of PLEASE TOKENS SPDU.. 35 7.17.2 Sending the PLEASE TOKENS SPDU 36 7.17.3 Receiving the PLEASE TOKENS SPDU... 36 7.18 GIVE TOKENS CONFIRM SPDU.... 36 7.18.1 Content of GIVE TOKENS CONFIRM SPDU 36 7.18.2 Sending the GIVE TOKENS CONFIRM SPDU 36 7.18.3 Receiving the GIVE TOKENS CONFIRM SPDU. 36 7.19 GIVE TOKENS ACK SPDU... 36 7.19.1 Content of GIVE TOKENS ACK SPDU.. 36 7.19.2 Sending the GIVE TOKENS ACK SPDU... 36 7.19.3 Receiving the GIVE TOKENS ACK SPDU... 36 7.20 MINOR SYNC POINT SPDU... 36 7.20.1 Content of MINOR SYNC POINT SPDU. 37 7.20.2 Sending the MINOR SYNC POINT SPDU. 37 7.20.3 Receiving the MINOR SYNC POINT SPDU. 37 iii @ISO/IEC ISO/IEC 8327-1:1996(E) 7.21 MINOR SYNC ACK SPDU... 37 7.21.1 Conient of MINOR SYNC ACK SPDU.... 37 7.21.2 Sending the MINOR SYNC ACK SPDU.... 37 7.21.3 Receiving the MINOR SYNC ACK SPDU 38 7.22 MAJOR SYNC POINT SPDU ... 38 7.22.1 Content of MAJOR SYNC POINT SPDU.... 38 7.22.2