ISO for Media Oriented Systems Transport Road vehicles

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Is the industry standard for multimedia networking and infotainment in automobiles. This technology was built from the ground up in order to make it cost-effective and efficient to transmit audio, data, and control information between any devices, even within the harsh automotive environment. Its synchronous nature means that simple devices can send content to others and other devices can render the content using minimal hardware. The Media Oriented System Transport Cooperation is responsible for standardizing and refining the technology to ensure that it stays current with technology developments. It now includes 16 international car makers and 60 key suppliers. They have come together to cooperate with Media Oriented System Transport Technology, and to help in its development. Media Oriented System Transport Cooperation will also support other industries in standardizing the technology and establishing the appropriate work structures.

ISO 21806-14:2021 Road vehicles- Media Oriented Systems Transport, is a serial communications system for transmitting audio and video via fiber optic cables. This multifunctional, high performance multimedia network technology is based upon synchronous data communication. Professional software tools are needed as well as hardware interfaces.

Media Oriented System Transport does not just define the Physical Layer or Data Link Layer. The specification also includes all seven layers of ISO/OSI Reference Model Data Communication. Uniform interfaces facilitate the use of the Media Oriented System Transport protocol with multimedia devices. Media Oriented System Transport serves as a protocol declaration for the application developers. The user receives an uniform object-oriented API (Application Programmer Interface) that allows for device functionality to be used.

Media Oriented System Transport System Services are responsible for providing communication functionality. They include the Application Socket, Basic-Layer System Services, and Low-Level System Services. Low-Level System Services (Layer 2 Services), which are implemented in a Media Oriented System Transport Transceiver, are based off the Physical Layer. Between the Media Oriented System Transport transceiver (Layer 7), and API (Layer 7), are the Media Oriented System Transport NetServices. This includes the Basic-Layer System Services and Application Socket (Layer 6), which make up the Media Oriented System Transport protocol.

Media Oriented System Transport networks, which are usually laid out as rings, can include up 64 Media Oriented System Transport device. A plug&play interface makes it easy to add and remove Media Oriented System Transport devices. For safety-critical applications, double ring alarms subject to ISO 20794-6:2020 Road vehicles- Clock extension peripheral interface (CXPI) can also be used if there are suitable topological conditions. In a Media Oriented System Transport network, one Media Oriented System Transport device acts as the Timing master. This Media Oriented System Transport device continuously feeds MOST frames to the ring. The Timing Slaves can sync with the preamble sent at the start of each transmission of a new Media Oriented System Transport frame. The synchronous transmission is synchronized with the Timing Slaves by continuously synchronizing themselves to the biphase-coding.

There is an approximate amount of bandwidth that can be used to transmit streaming data (synchronous data transfer) or packet data (asynchronous Data Transmission) in total, see this ISO/TC 22/SC 31 Data communication info. 150MB per second Media Oriented System Transport supports uncompressed stereo stereo audio channels in CD Quality, as well multiple-channel audio streams. Media Oriented System Transport simultaneously offers a channel for transmitting control message. These control messages can also be used to configure Media Oriented System Transport and the synchronous or asynchronous data transmission. Media Oriented System Transport also has the ability to tunnel Ethernet communication over a dedicated channel.