What is MOST?
MOST stands for Media Oriented Systems Transport and is a network technology developed specifically for communication in the automotive sector. It is a standard for transmitting data, especially audio, video, and control data, via an optical fiber (LWL). In many modern vehicles, MOST is used as the central backbone for the infotainment system.
The Role of Optical Fiber (LWL)
An optical fiber, also known as a fiber optic cable, is a strand of glass or plastic that can transmit light over long distances. In the context of MOST, this optical cable is used for data transfer.
Fast Data Transmission: Optical fiber allows for very high data rates, which are essential for the simultaneous, real-time transmission of high-resolution audio and video data.
Immunity to Electromagnetic Interference: Unlike traditional copper cables, optical fibers are immune to electromagnetic fields. This is a crucial advantage in the complex electronic environment of a vehicle, where many control units and systems communicate with each other, as it prevents interference.
Low Weight: Optical fiber cables are lighter than copper cables, which helps reduce the vehicle's weight and thus lowers fuel consumption.
Structure of a MOST Network
The MOST network is typically configured as a ring topology. All devices connected to the network—such as the radio, navigation system, CD changer, amplifier, or rear-seat displays—are linked together in a closed ring. Data is sent in one direction until it reaches its destination. If a device fails or the connection is interrupted, the entire ring can be disrupted, which is why diagnostics and troubleshooting in MOST networks can be somewhat complex.
Vehicle Applications
The MOST system networks all components responsible for multimedia entertainment and communication:
Infotainment System: Transmission of audio data to the amplifier, display of navigation maps on the screen.
Driver Assistance Systems: Integration of cameras or radar systems that process high-resolution video data.
Voice Control and Hands-Free Systems: Rapid transmission of voice commands and audio data.
Overall, the combination of optical fiber and MOST enables a reliable and high-performance network for infotainment systems that meets the high demands of modern automobiles.
