BS ISO/IEC 8327-1:1996

SECTION 1 - GENERAL
1 Scope
2 Normative references
   2.1 Identical Recommendations/International
        Standards
   2.2 Paired Recommendations/International Standards
        equivalent in technical content
   2.3 Additional References
3 Definitions
   3.4 Session protocol definitions
4 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 Protocol version numbers
   5.6 Functional units
   5.7 Tokens
   5.8 Negotiation
   5.9 Local variables
SECTION 2 - 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 OVERFLOW ACCEPT SPDU
   7.3 CONNECT DATA OVERFLOW SPDU
   7.4 ACCEPT SPDU
   7.5 REFUSE SPDU
   7.6 FINISH SPDU
   7.7 DISCONNECT SPDU
   7.8 NOT FINISHED SPDU
   7.9 ABORT SPDU
   7.10 ABORT ACCEPT SPDU
   7.11 DATA TRANSFER SPDU
   7.12 EXPEDITED SPDU
   7.13 TYPED DATA SPDU
   7.14 CAPABILITY DATA SPDU
   7.15 CAPABILITY DATA ACK SPDU
   7.16 GIVE TOKENS SPDU
   7.17 PLEASE TOKENS SPDU
   7.18 GIVE TOKENS CONFIRM SPDU
   7.19 GIVE TOKENS ACK SPDU
   7.20 MINOR SYNC POINT SPDU
   7.21 MINOR SYNC ACK SPDU
   7.22 MAJOR SYNC POINT SPDU
   7.23 MAJOR SYNC ACK SPDU
   7.24 RESYNCHRONIZE SPDU
   7.25 RESYNCHRONIZE ACK SPDU
   7.26 PREPARE SPDU
   7.27 EXCEPTION REPORT SPDU
   7.28 EXCEPTION DATA SPDU
   7.29 ACTIVITY START SPDU
   7.30 ACTIVITY RESUME SPDU
   7.31 ACTIVITY INTERRUPT SPDU
   7.32 ACTIVITY INTERRUPT ACK SPDU
   7.33 ACTIVITY DISCARD SPDU
   7.34 ACTIVITY DISCARD ACK SPDU
   7.35 ACTIVITY END SPDU
   7.36 ACTIVITY END ACK SPDU
   7.37 Additional Elements of Procedure for Segmented
        SSDUs
8 Structure and encoding of SPDUs
   8.1 TSDU structure
   8.2 SPDU structure
   8.3 SPDU identifiers and associated parameter fields
   8.4 Additional encoding rules for segmented SSDUs
   SECTION 3 - CONFORMANCE
9 Conformance to this Recommendation/International
   Standard
   9.1 Static conformance requirements
   9.2 Dynamic conformance requirements
   9.3 Protocol Implementation Conformance Statement
Annex A - State tables
      A.1 General
      A.2 Notation for state tables
      A.3 Conventions for entries in state tables
      A.4 Actions to be taken by the SPM
          A.4.1 Invalid intersections
          A.4.2 Valid intersections
          A.4.3 Receipt of SPDUs
      A.5 Definitions of sets and variables
          A.5.1 Functional units
          A.5.2 Tokens
          A.5.3 SET of tokens
          A.5.4 Variables
                 A.5.4.1 TEXP
                 A.5.4.2 Vact
                 A.5.4.3 Vnextact
                 A.5.4.4 Vrsp and Vrspnb
                 A.5.4.5 Vrsps, Vrspr, Vspnbs and Vrspnbr
                 A.5.4.6 SPMwinner
                 A.5.4.7 Vtca
                 A.5.4.8 Vtrr
                 A.5.4.9 Vcoll
                 A.5.4.10 Vdnr
                 A.5.4.11 V(A)
                 A.5.4.12 V(M)
                 A.5.4.13 V(R)
                 A.5.4.14 Vsc
                 A.5.4.15 V(Ado)
                 A.5.4.16 V(Adi)
                 A.5.4.17 V(As), V(Ar)
                 A.5.4.18 V(Ms), V(Mr)
                 A.5.4.19 V(Rs), V(Rr)
                 A.5.4.20 Discard-rce-flow-Discard-snd-
                          flow
Annex B - PGIs and PIs reserved for use by
Recommendation T.62
Annex C - Relationship to Recommendation T.62 encoding
Annex D - Difference between Protocol Version 1 and
Protocol Version 2

Defines: a. Procedures for a single protocol for transferring data and control information from one session entity to a peer session entity, b. Means of selecting the functional units for use by the session entities, c. structure and encoding of session protocol data units to transfer data and control information.

This Recommendation I International Standard specifies: procedures for a single protocol for the transfer of data and control information from one session entity to a peer session entity; the means of selecting the functional units to be used by the session entities; the structure and encoding of the session protocol data units used for the transfer of data and control information; The procedures are defined in terms of: the interactions between peer session entities through the exchange of session protocol data units; the interactions between a session entity and the session service user in the same system through the exchange of session service primitives; the interactions between a session entity and the transport service provider through the exchange of transport service primitives. These procedures are applicable to instances of communication between systems which support the session layer of the OSI Reference Model and which wish to interconnect in an open systems environment. This Recommendation I International Standard also specifies conformance requirements for systems implementing these procedures. It does not contain tests which can be used to demonstrate this conformance. The text pertaining to the symmetric synchronization functional unit is not applicable to the support of ITU-T applications.