MOST (Media Oriented Systems Transport)


MOST (Media Oriented Systems Transport) is a high-speed multimedia network technology for the automotive industry. It can be used for applications inside or outside the car. The serial MOST bus uses a daisy-chain topology or ring topology and synchronous serial communication to transport audio, video, voice and data signals via plastic optical fiber (POF) (MOST25, MOST150) or electrical conductor (MOST50, MOST150) physical layers.

MOST is a function-oriented communication technology to network a variety of multimedia devices comprising one or more MOST nodes. Each node has a Network Interface Controller (NIC) that provides the necessary network services. The MOST nodes can be audio, video, or data devices, such as radios, navigation systems, displays, cameras, and airbags. The NIC also contains a Function Block (FBlock) that provides the specific functionality of the node.

MOST supports three types of channels:

  • Control Channel: This channel is used for event-oriented transmission with low bandwidth (10 kBits/s) and short package length.
  • Asynchronous Channel: This channel is used for packet-oriented transmission with large block size and high bandwidth.
  • Synchronous Channel: This channel is used for continuous data streams that require high bandwidth.

MOST uses a three-layer architecture:

  • Physical layer: This layer is responsible for the transmission of data over the physical medium. The MOST physical layer supports two data rates: 25 Mbps and 150 Mbps.
  • Data link layer: This layer is responsible for the reliable transfer of data between nodes. The MOST data link layer uses a token-based protocol to ensure that only one node can transmit data at a time.
  • Application layer: This layer is responsible for the communication between applications on different nodes. The MOST application layer provides a set of services for transporting audio, video, and data.

The MOST protocol supports a variety of features, including:

  • Low latency: The MOST protocol is designed to provide low latency, which is important for real-time applications such as audio and video streaming.
  • QoS (Quality of Service): The MOST protocol supports QoS, which allows for different types of data to be transmitted with different priorities.
  • Scalability: The MOST protocol is scalable, which means that it can be used to connect a large number of devices.

MOST is a very reliable and efficient communication protocol. It is used in a wide variety of automotive applications, including:

  • Audio: MOST is used to transport audio signals between different audio devices in the car, such as the radio, the navigation system, and the speakers.
  • Video: MOST is used to transport video signals between different video devices in the car, such as the display, the rearview camera, and the navigation system.
  • Data: MOST is used to transport data between different data devices in the car, such as the airbag control unit and the navigation system.

Here are some additional details about the MOST protocol:

  • The MOST network can support up to 64 nodes.
  • The MOST protocol supports data rates up to 150 Mbps.
  • The MOST protocol is based on the OSI (Open Systems Interconnection) model.
  • The MOST protocol is standardized by ISO (International Organization for Standardization).

MOST is a reliable and efficient communication protocol that is well-suited for the demanding requirements of automotive multimedia applications. It is used in a wide range of vehicles, including cars, trucks, buses, and even airplanes.

Here are some of the advantages of MOST:

  • High bandwidth: MOST can support data rates of up to 150 Mbps, which is sufficient for high-quality audio and video streaming.
  • Low latency: MOST has a low latency of <100 microseconds, which is important for real-time applications such as audio streaming.
  • Scalability: MOST can be scaled to support a large number of nodes.
  • Reliability: MOST is a reliable protocol that is well-suited for the demanding requirements of automotive applications.

Here are some of the disadvantages of MOST:

  • Cost: MOST is a more expensive solution than some other automotive networking protocols.
  • Complexity: MOST is a more complex protocol than some other automotive networking protocols.
  • Security: MOST is not as secure as some other automotive networking protocols.

MOST is a high-performance, reliable, and efficient communication protocol that is well-suited for the demanding requirements of automotive multimedia applications. It is used in a wide range of vehicles, and its popularity is likely to continue to grow in the future.

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