Data Transport

MOST currently offers a band-width of 22.5 Mbits/s. In the next generation, the bandwidth will be increased to 50 and then later to 150 Mbits/s (as of approx. 2002).

In order to meet the different requirements of the applications regarding data transport, each MOST message is divided into three parts:

• Control data
• Asynchronous data: e.g. navigation system, arrow representation
• Synchronous data: e.g. audio, video signals
  Fig 1: Identifying Data Transport

  Courtesy of BMW OF NORTH AMERICA, INC.

The control data controls the functions and devices in the network. The information can be compared to CAN bus data.

The control data has a band-width of 700 Kbit/s. That corresponds to around 2700 messages per second.

For the data transmission of synchronous and/or asynchronous data, there is a total of 60 bytes. The limit is variable: e.g. 20 bytes of synchronous data and 40 bytes of asynchronous data.