System Overview

System Overview

MOST Technology

Until very recently, only very few entertainment-related control units were networked. In the course of the development, the number of components increased continuously.

In addition, the scope of functions of individual components has been extended considerably. In particular, however, completely new logical networking means that all the components are growing to become a system: individual functions work together and produce a high-quality overall system. This results in significant growth in system complexity.

This new dimension of system complexity can no longer be managed using the existing bus systems.







MOST Multimedia Network

MOST technology meets 2 essential requirements:

1. The MOST bus transports control data as well as data from audio, video, navigation and other services (SMS=Short Message Service, TMC =Traffic Message Channel, in other markets).

2. MOST technology provides a logical framework model for control of the variety and complexity of data: the MOST Application Framework. The MOST Application Framework organizes the functions of the overall system.

MOST is able to control and dynamically manage functions that are distributed in the vehicle.

Principle of a Multimedia Network

An important feature of a multimedia network is that it transports not only control data and sensor data, e.g. like the CAN bus and I bus (instrumentation bus). A multimedia network can also carry digital audio and video signals and graphics as well as other data services.

Information transmitted on MOST network







Advantages of the Multimedia Network

All data can be transported across a shared network. This offers the following benefits:

- Additional signal wiring harnesses are eliminated.
- The only addition many control units need is the power supply.
- As each participant (=each control unit) has access to all the data, cost-intensive assemblies for signal distribution can be eliminated.

Different data formats also have different requirements for transmission regarding both mechanism (synchronous or asynchronous data) and the required band-width (baud or bits/second). The MOST format is able to meet these requirements to a satisfactory extent.

Data Quantities

The aim is that in the near future all vehicle occupants can call up different services at one time, e.g:

- The driver calls up navigation information.
- The passenger talks on the telephone.
- A rear seat passenger listens to a CD.
- The other rear seat passenger watches a DVD video.

The data quantities this requires produce the following example:







Using MOST, there is already the capability today to transport these large data quantities.