CSA Z243.155 : 0

Technical Committee on Open Systems
Preface
0 Introduction
1 Scope and field of application
2 References
Section one: General
3 Definitions
4 Symbols and abbreviations
   4.1 Data units
   4.2 SPDU fields
   4.3 Timer variables
   4.4 Miscellaneous
   4.5 Local variables
5 Overview of the session protocol
   5.1 Model of the Session Layer
   5.2 Services provided by the Session Layer
   5.3 Services assumed from the Transport Layer
   5.4 Functions of the Session Layer
   5.5 Functional units
   5.6 Tokens
   5.7 Negotiation
   5.8 Local variables
Section two: Session protocol specification
6 Use of the transport service
   6.1 Assignment of a session connection to the
        transport connection
   6.2 Reuse of the transport connection
   6.3 Use of transport normal data
   6.4 Use of transport expedited data
   6.5 Flow control
   6.6 Transport disconnection
7 Elements of procedure related to SPDUs
   7.1 CONNECT SPDU
   7.2 ACCEPT SPDU
   7.3 REFUSE SPDU
   7.4 FINISH SPDU
   7.5 DISCONNECT SPDU
   7.6 NOT FINISHED SPDU
   7.7 ABORT SPDU
   7.8 ABORT ACCEPT SPDU
   7.9 DATA TRANSFER SPDU
   7.10 EXPEDITED SPDU
   7.11 TYPED DATA SPDU
   7.12 CAPABILITY DATA SPDU
   7.13 CAPABILITY DATA ACK SPDU
   7.14 GIVE TOKENS SPDU
   7.15 PLEASE TOKENS SPDU
   7.16 GIVE TOKENS CONFIRM SPDU
   7.17 GIVE TOKENS ACK SPDU
   7.18 MINOR SYNC POINT SPDU
   7.19 MINOR SYNC ACK SPDU
   7.20 MAJOR SYNC POINT SPDU
   7.21 MAJOR SYNC ACK SPDU
   7.22 RESYNCHRONIZE SPDU
   7.23 RESYNCHRONIZE ACK SPDU
   7.24 PREPARE SPDU
   7.25 EXCEPTION REPORT SPDU
   7.26 EXCEPTION DATA SPDU
   7.27 ACTIVITY START SPDU
   7.28 ACTIVITY RESUME SPDU
   7.29 ACTIVITY INTERRUPT SPDU
   7.30 ACTIVITY INTERRUPT ACK SPDU
   7.31 ACTIVITY DISCARD SPDU
   7.32 ACTIVITY DISCARD ACK SPDU
   7.33 ACTIVITY END SPDU
   7.34 ACTIVITY END ACK SPDU
8 Structure and encoding of SPDUs
   8.1 TSDU structure
   8.2 SPDU structure
   8.3 SPDU identifiers and associated parameter fields
Section three: Conformance
9 Conformance to this International Standard
Annexes
A - State tables
B - Relationship to CCITT Recommendation T.62 encoding
C - PGI and PIs reserved for use by CCITT Recommendation
    T.62
D - Corrections incorporated in ISO 8327:1987
Addendum 1 - Session Symmetric Synchronization for the
             Session Protocol

This standard gives procedures for a single protocol for transfer of data and control information from one session entity to a peer session entity; the means to select the functional units to be used by the session entities; and the structure and encoding of the session protocol data units that are used for the transfer of data and control information.