INTRODUCTION
1 General
    1.1 Scope and object
    1.2 Normative references
    1.3 Acronyms and definitions
2 N service definition
    2.1 Overview of interactions
          2.1.1 Data transfer services
          2.1.2 Management services
    2.2 N_Data.request
          2.2.1 Function
          2.2.2 Structure
          2.2.3 Use
    2.3 N_Data.confirm
          2.3.1 Function
          2.3.2 Structure
          2.3.3 Use
    2.4 N_Data.indication
          2.4.1 Function
          2.4.2 Structure
          2.4.3 Use
    2.5 N_Add_rout.request
          2.5.1 Format
          2.5.2 Structure
          2.5.3 Use
    2.6 N_Del_route.request
          2.6.1 Function
          2.6.2 Structure
          2.6.3 Use
    2.7 N_Read_table.request
          2.7.1 Function
          2.7.2 Structure
          2.7.3 Use
    2.8 N_Read_table.confirm
          2.8.1 Function
          2.8.2 Structure
          2.8.3 Use
    2.9 N_Await_event.request
          2.9.1 Function
          2.9.2 Structure
          2.9.3 Use
    2.10 N_Await_event.confirm
          2.10.1 Function
          2.10.2 Structure
          2.10.3 Use
    2.11 N_Local_address.request
          2.11.1 Function
          2.11.2 Structure
          2.11.3 Use
3 N to LLC sublayer interface
    3.1 Overview of interactions
    3.2 DL_Data.request
    3.3 DL_Data.confirm
    3.4 DL_Data.indication
4 N-protocol data unit structure
    4.1 General
    4.2 NPDU format
    4.3 Network address fields
    4.4 DNSAP field and the P-bit
    4.5 SNSAP field and the O-bit
    4.6 QoS field
    4.7 Reserved field
    4.8 Invalid NPDU
5 N-protocol procedures description
    5.1 Overview of the procedures
          5.1.1 Procedure for transmission
          5.1.2 NPDU routing
          5.1.3 Parity bits
          5.1.4 N-entity internal parameters
    5.2 N-entity flow diagram
          5.2.1 N_Data.request flow diagram
          5.2.2 DL_Data.indication flow diagram
          5.2.3 DL_Data.confirm flow diagram
          5.2.4 N-protocol machine actions
6 Mapping of network layer
Figures
1 Basic layered communication architecture
2 Subnetwork interconnection through application gateway
3 Subnetwork interconnection through a node routing station
4 Subnetwork interconnection in a mixed approach
5 Data transfer without acknowledgment
6 Routing function in the network layer for messages coming
    from N-user
7 Routing function in the network layer for messages to be
    locally delivered
8 Routing function in the network layer for messages to
    be forwarded
9 NPDU fields
Annex ZA Normative references to international publications
with their corresponding European publications