• SAE J2366/2_200111

SAE J2366/2_200111

Link Layer

SAE International , 11/01/2001

Publisher: SAE

File Format: PDF

$61.00$123.00


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

The ITS Data Bus (IDB) is a non-proprietary 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 first version of the IDB is called IDB-C.

This Recommended Practice describes the Link Layer of the IDB-C, as shown in Section 1. Below the Link Layer of the IDB-C is the CAN 2.0B Link Layer. The Physical Layer of the IDB-C incorporates the Physical Layer as specified by SAE J2366-1 and J2590.

The IDB-C Link Layer is logically divided into two functional sub-layers, viz., Logical Link Control (LLC) and Media Access Control (MAC). However, these are logical groupings that re-use some of the same bits within the CAN 2.0B frame for efficiency.

The MAC sub-layer handles all media access functions, such as virtual token handling, addressing, and notifications of IDB-C configuration changes to other MAC layers on the IDB-C.

The LLC sub-layer provides the mechanisms to send and receive point-to-point or broadcast frames to other LLC sub-layers on the IDB-C. In addition, the LLC provides an Alternate Transport Identifier (ATID) allowing more than one set of higher layer protocols to be used on a single Node.

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