I.S. EN 61334-4-61:1999

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

Describes the services needed by the DCP network layer (N) sublayer entity at the logical interfaces with the N user layer and LLC sublayer, by means of the connectionless N procedures.