MOST Bus: Notes

Of the 2 fiber optic networks introduced on the E65, the MOST bus is used for audio, entertainment and communication systems. MOST stands for Media Orientated Systems Transport.

Starting in 1998, OEM manufacturers such as Audi, Becker, BMW and Daimler/Chrysler came together to develop a common multi-media network. As of 2001, MOSTCo (Cooperation) has approximately 65 members including all of the American and European auto manufacturers. Toyota and Nissan represent the Japanese auto industry. MOSTCo now unites about 90 percent of global automotive production and is now on track to becoming the standard for automotive multi-media services.

Since the introduction of the E65, MOST has been added to the E60, E63 and E64 vehicles. MOST will also be a part of future BMW models as well.

Fig 1: Identifying MOST Bus On E38 And E65

Courtesy of BMW OF NORTH AMERICA, INC.

In comparison with the E38, which had only a few entertainment-related control units on the network, the E65 has a significant increase in multi-media systems. This requires a bus network with a substantial amount of bandwidth (communication speed). The MOST bus was introduced with a data rate of 22.5 Mbps and will be increased as system needs demand.