SAE J2366/4_200203

1 Scope
2 References
  2.1 Applicable documents
       2.1.1 SAE Publications
       2.1.2 CAN publication
  2.2 Related publications
       2.2.1 SAE publications
       2.2.2 ISO publication
3 Definitions
  3.1 ACK
  3.2 AMH
  3.3 AML
  3.4 Bit
  3.5 Clear
  3.6 Dominant
  3.7 Frame
  3.8 Frame group
  3.9 IDB
  3.10 ITS
  3.11 NACK or NAK
  3.12 Node
  3.13 Octet
  3.14 OEM
  3.15 OSI
  3.16 Out of band
  3.17 PDU
  3.18 Recessive
  3.19 Set
  3.20 TTC
  3.21 TTD
  3.22 Time intervals
       3.22.1 Frame group acknowledge timer, T[MaxAck]
       3.22.2 Inactivity timer, T[inactivity]
       3.22.3 Frame group timer, T[FrameGroup]
4 Protocol overview
  4.1 Basic concepts
  4.2 Frame format overview
  4.3 Frame elements
       4.3.1 Data frame elements
       4.3.2 Control frame elements
  4.4 Frame grouping, acknowledgement and resynchronization
       4.4.1 Frame grouping
       4.4.2 Positive acknowledgement
       4.4.3 Negative acknowledgement
       4.4.4 Resynchronization
  4.5 Data frame type usage
       4.5.1 Use of DATAFRAMESINGLE frame
       4.5.2 Use of DATAFRAMESTART, DATAFRAMECONT, DATAFRAMEEND
             and DATAFRAMERESYNC frames
  4.6 Message data ordering
  4.7 Transport layer primitives
       4.7.1 Primitives invoked by upper layers
       4.7.2 Primitives invoked by SAE J 2366-4
       4.7.3 Primitives invoked by lower layers
  4.8 Transport layer diagnostics
       4.8.1 BrdcastMsgErrCntr
       4.8.2 NAKRcvCntr
       4.8.3 NAKTxCntr

This SAE Recommended Practice details the Thin Transport Layer of the Intelligent Transportation Systems (ITS) Data Bus, which is generally intended for in-vehicle use.

This SAE Recommended Practice details the Thin Transport Layer of the Intelligent Transportation Systems (ITS) Data Bus, which is generally intended for in-vehicle use.The Thin Transport Layer sits between SAE J2366-2 and J2366-7. It provides the handling of such activities as the packetizing of long messages and message reassembly. Design of the messages and headers has stressed economy, in terms of bits within a CAN 2.0B frame.The ITS Data Bus (IDB) is a non-proprietary virtual token passing bus, designed to allow disparate consumer, vehicle, and commercial electronic components to communicate and share information across a standard, open data bus.This document describes the Thin Transport Layer of the IDB, as shown in Figure 1.