DIN ISO 8648:1990-07

0 Introduction
1 Scope and field of application
2 References
3 Definitions
  3.1 Reference model definitions
  3.2 Service conventions definitions
  3.3 Network Layer architecture definitions
4 Abbreviations
5 Network Layer concepts and terminology
  5.1 Real world objects and abstract elements
  5.2 End Systems and intermediate systems
      5.2.1 End system considerations
      5.2.2 Intermediate system considerations
  5.3 Real subnetworks and Subnetworks
  5.4 Relay systems and interworking units
  5.5 Data transmission service and subnetwork service
  5.6 Service types
6 Organization of the Network Layer
  6.1 Factors which influence the Internal organization of
      the Network Layer
  6.2 Description of the possible rotes for a Network
      Layer protocol
  6.3 Subnetwork access protocols
  6.4 Subnetwork independent convergence protocols
  6.5 Subnetwork dependent convergence protocols
      6.5.1 Relationship of SNDCP to SNICP
      6.5.2 Relationship of SNDCP to the OSI Network
            Service
  6.6 Relaying and routeing
  6.7 Single Network Layer protocol fulfilling all protocol
      roles
7 Application of the Network Layer Internal organization
  7.1 Interconnection of subnetworks supporting all
      elements of the OSI Network Service
  7.2 Hop-by-hop harmonization
  7.3 Use of an internetworking protocol approach
  7.4 Combinations of approaches for interconnecting
      subnetworks
8 Interconnection scenarios
  8.1 Single data-link/single subnetwork interconnection
  8.2 Interconnections involving subnetworks which support
      all elements of the Network Service
  8.3 Interconnections involving multiple protocol
      combinations

Describes an architectural model of the OSI Network Layer as a framework for OSI Network Layer standardization, allowing incorporation of existing networks within the OSI architecture.