BS ISO/IEC 8878:1992

Foreword
Introduction
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
3.1 Reference Model definitions
3.2 Service Conventions definitions
3.3 Network Service definitions
3.4 X.25 definitions
3.5 X.96 definitions
4. Abbreviations
4.1 Network Service abbreviations
4.2 X.25 abbreviations
5. Overview
5.1 Elements of the X.25/PLP-1984 used to support the
      OSI CONS
5.2 General operation of the X.25/PLP-1984 for
      supporting the OSI CONS
6. Network connection establishment phase
6.1 Primitive/Parameter and packet/field relationships
6.2 Procedures
7. Network connection release phase
7.1 Primitive/Parameter and packet/field relationships
7.2 Procedures
8. Data transfer phase - Data transfer service
8.1 Primitive/Parameter and packet/field relationships
8.2 Procedures
9. Data transfer phase - Receipt confirmation service
9.1 Primitive and packet/field relationships
9.2 Procedures
10. Data transfer phase - Expedited data transfer
      service
10.1 Primitive/Parameter and packet/field relationships
10.2 Procedures
11. Data transfer phase - Reset service
11.1 Primitive/Parameter and packet/field relationships
11.2 Procedures
12. Response to protocol violations
13. Conformance
13.1 Conformance requirements
13.2 Optional features
Annex A: X.25 (1980) Subnetwork Dependent Convergence
         Protocol
A.1 Introduction
A.2 Scope
A.3 Abbreviations
A.4 Overview of the protocol
A.5 Protocol mechanisms
A.6 Protocol description
A.7 Protocol encoding in X.25 packets
Annex B: Classification
B.1 Classification of systems
B.2 Functionality of classes
B.3 Scenarios
B.4 Procedures for selecting class of operation
B.5 Interworking by relay system
Annex C: Subnetwork Convergence Protocol for Use with
         X.25 Permanent Virtual Circuits
C.1 Introduction and scope
C.2 Overview
C.3 Abbreviations
C.4 Protocol mechanisms
C.5 Protocol encoding for NC establishment and release
Annex D: Protocol Implementation Conformance Statement
         Proforma
D.1 Introduction
D.2 Scope
D.3 Normative references
D.4 Definitions
D.5 Abbreviations
D.6 Protocol Implementation Conformance Statement
      Proforma
D.7 Modified PICS requirements for ISO/IEC 8208
Annex E: Additional Considerations of CONS Primitives
E.1 Introduction
E.2 Environment for X.25/PLP operation
Annex F: Use of X.25/PLP NPAI
F.1 Introduction
F.2 Obtaining an SNPA address
F.3 Examples of Network Address encoding
Annex G: Transit Delay Calculations
Annex H: Example of Priority Negotiation
Annex I: Differences between Recommendation X.223 and
         ISO/IEC 8878

Defines two methods for providing the OSI Connection Mode Network Service (CONS) by using the X.25 Packet Level Protocol (X.25/PLP). The first method (in the main body of this standard) specifies a mapping between elements of the OSI CONS and elements of the 1984 version of the X.25/PLP (X.25 PLP 1984). The second method (in Annex A of this standard) defines a Subnetwork Dependent Convergence Protocol (SNDCP) that shall be used to provide the OSI CONS over subnetworks or with equipment using the 1980 version of the X.25/PLP. Also covers the annexes B E of this standard; the terms of definition for the OSI Network Service; the relationship between the OSI CONS and the X.25/PLP 1984 and the terms of definition for the X.25/PLP 1984.