This standard is applicable to transportation devices and management systems that must operate in Intelligent Transportation Systems. It specifies a set of protocols and standards applicable to the data link and physical layers of the OSI Basic Reference Model. It specifies a combination of ISO/IEC Standards that collectively provide for connectionless and connection-oriented data link services on a common@ shared media. Access to the media is through a process referred to as carrier sense multiple access with collision avoidance detection (CSMA/CD). It also defines the interface to and specification of the shared media.Networks based upon this technique are often@ but mistakenly@ referred to as Ethernet-based Networks. This standard deals with IEEE 802 Networks that have additional functionality. Although similar to Ethernet based Networks@ IEEE 802 Networks are distinguished by inclusion of Logical Link Control (LLC) and Media Access Control (MAC) layers.