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ISO 11783/SAE J1939 Network Layer. Lecture 6 Network Layer ISO 11783 Part 4, J1939-31 BAE 5030 - 353 Spring 2009 Instructor: Marvin Stone Biosystems and Agricultural Engineering Oklahoma State University. Purpose of Network Layer. Defines functionality of network interconnection units

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Iso 11783 sae j1939 network layer

ISO 11783/SAE J1939 Network Layer

Lecture 6 Network Layer

ISO 11783 Part 4, J1939-31

BAE 5030 - 353

Spring 2009

Instructor: Marvin Stone

Biosystems and Agricultural Engineering

Oklahoma State University

BAE 5030-353


Purpose of network layer
Purpose of Network Layer

  • Defines functionality of network interconnection units

    • Segment to segment communication

    • Network Interconnection Unit tasks

      • Transfer of messages between segments

        • Forwarding

        • Filtering

        • Address translation

        • Re-packaging

        • Performance statistics

BAE 5030-353


Network interconnection unit types
Network Interconnection Unit types

  • Repeater

    • Bit level repeating from one segment to another (physical layer)

    • Adds to effective bus length (propagation delay)

  • Bridge

    • Receives, stores and forwards messages from one segment to another (data link layer)

    • May filter messages

    • Maximum recommended transit delay is 50 ms

  • Router

    • May re-map addresses of messages from one segment to another (network layer)

    • Does not allow address claims to pass across

  • Gateway

    • Interconnects ISO 11783 protocol to different protocols (eg. Ethernet)

BAE 5030-353


Iso 11783 system
ISO 11783 System

BAE 5030-353


Network port identification
Network Port Identification

  • Port Numbering

    • Each port on a network interconnection device is numbered for reference. These are standardized in Parts 1 and/or in 4 and 9


Network layer message
Network Layer Message

  • Purpose

    • Acquiring NIU performance statistics

    • Setup and management of filter databases

  • Control Byte Functions

    • Filter Database Management ( 7 functions)

      • Setup filtering between port-pairs

    • Access and Reset General and Parametrics ( 3 Functions)

      • Access or reset general NIU performance data

    • Access and Reset Port-Pair Parametrics ( 3 Functions)

      • Access or reset port-pair specific NIU performance data

    • Topology query (2 functions)

      • Access Network Topology

BAE 5030-353


Filter database management
Filter Database Management

Message sent by transport protocol if needed

BAE 5030-353


Access and reset parameterics
Access and Reset Parameterics

General

Port Specific

BAE 5030-353



Topology query
Topology Query

Provision to allow network topology to be determined


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