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Automotive Buses and Vehicle Buses
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Automotive Buses and Vehicle Buses
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Automotive Buses and Vehicle Buses
Automotive Buses
[ MOSTbus ] [ J1850 bus ] [ byteflight ] [ OBDII ] [ FlexRay ]
[
D2B ] [ SMARTwireX ] [ IDB-1394 ] [ IEBus ] [ Intellibus ] [ LIN bus ] [ CAN bus ]
[
MI bus ] [ DSI bus ] [ BST bus ] [ MML bus ] [ J1708 bus ]
[
Bus Info Page ]
[Home]
Note: There are six classifications of vehicle Buses: Class A, Class B, Class C, Emissions/Diagnostics, Mobile
Media, and X-by-Wire. Many of the buses listed below have a notation defining what class they reside in.
Class A: A multiplex wiring system which reduces wiring by transmitting and receiving multiple signals over the
same signal bus. The multi-purpose bus replaces individual wires performing the same function. Normally Class
A defines general purpose UART communication with bit rates below 10kbps
Class B: A multiplex wiring system which transmits data between nodes. The nodes replace existing stand-alone
modules. Used as a non-critical 10kbps to 125kbps bus
Class C: A multiplex wiring system which reduces wiring by using real-time high-data signals. Operating
between 125kbps and 1Mbps
Emissions/Diagnostics: handle either Emissions or Diagnostics buses.
Mobile Media: buses handle Mobile Media equipment.
X-by-Wire: is the collective term for the addition of electronic systems into the vehicle to enhance and replace
tasks that were previously accomplished via mechanical and hydraulic systems. Automotive temperature
requirements are -40C to +125C.
In addition, a number of the listed buses define the Electrical Physical layer and the Optical Physical layer, which
is normal for a bus which defines both interface types. The Physical interface bus being either fiber [Optical] or
wire [electrical]. The difference here, in some cases, is that the electrical interface being defined resides just prior
to the optical encoder. So the Physical interface bus from device to device is optical [fiber], but the specification
also defines the Physical [electrical] interface into the optical transmitter/receiver [which is not normally done
outside of Automotive buses].
Also: ... "It is becoming clear that regardless of carmaker, new vehicles will be made using LIN for the lowest
data-rate functions, CAN for medium speed, MOST for the high-speed data rates and FlexRay, for safety-critical
applications such as steer- and brake-by-wire." from Automotive Industries.
MOST bus Description
MOST bus: [Media Oriented Systems Transport], defines a multimedia fiber-optic (low overhead, low
cost) point-to-point network implemented in a ring, star or daisy-chain topology over Plastic optical fibers
[POF]. The MOST bus specifications define the Physical [Electrical and Optical parameters] Layer as well
as the Application Layer, Network Layer, and Medium Access Control.The MOST bus provides an optical
http://www.interfacebus.com/Design_Connector_Automotive.html (1 of 9)3/27/2005 12:15:46 PM
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