MOST Structure: Notes

WARNING: This page does not describe the selected car, but rather 59 other vehicles, including the 2009 BMW M5, 2009 BMW 650i, 2009 BMW 550i, 2008 BMW M5, and 2008 BMW 760Li. However, it is still accessible from the selected car via links, so may be relevant.

The MOST bus is configured in a "ring" structure. Data transmission on the ring takes place in one direction only. Messages can be transmitted provided the bus ring is complete and fully functional.

A failure, such as an interruption in the ring, will cause a complete failure of the MOST ring. All modules on the MOST bus will cease to function when there is an open in the MOST bus.

Fig 1: Graphic Example Of "Ring Structure" Used On Most Bus

Courtesy of BMW OF NORTH AMERICA, INC.

Fig 2: Example Of MOST Bus On E65

Courtesy of BMW OF NORTH AMERICA, INC.