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`Automakers pick MOST as high-speed in-car bus | EE Times
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`News & Analysis
`Automakers pick MOST as high-
`speed in-car bus
`Automakers pick MOST as high-speed in-car bus
`Charles J. Murray
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`11/13/2000 05:04 PM EST
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`PARK RIDGE, Ill. — A consortium of the world's biggest
`automakers last week said it would endorse the high-speed
`network fiber-optic bus known as MOST (Media Oriented Systems
`Transfer) by the first quarter of 2001, and possibly as soon as the
`end of this year. The Automotive Multimedia Interface Collaboration
`(AMI-C) made the announcement at a technical conference in
`Turin, Italy.
`
`Endorsement by the AMI-C consortium is viewed as a critical step,
`because the group includes BMW, DaimlerChrysler, Fiat, Ford,
`General Motors, Honda, Mitsubishi, Nissan, PSA Peugeot-Citroen,
`Renault, Toyota and Volkswagen. However, some AMI-C members
`expect the group will ultimately endorse a second high-speed bus,
`possibly IEEE 1394.
`
`"No later than first quarter of next year, we should have a steering
`committee meeting where we endorse MOST," said Michael
`Noblett, program manager for AMI-C. "Unless something earth-
`shattering occurs between now and then, it's going to happen."
`
`Use of a common high-speed bus could help carmakers and their
`suppliers simplify the process of adding to vehicles a host of
`multimedia devices such as navigation systems, CD players, video
`screens, digital radios, cell phones and in-car PCs. Today, vendors
`often redesign products several times to meet the requirements of
`each automaker's proprietary data bus network.
`
`Royalty-free and open
`
`Endorsement of MOST is seen as a key step for vehicle
`manufacturers facing an explosion of automotive electronic
`products. Use of a standard network would let them add new
`electronics closer to a vehicle's introduction date. For example,
`manufacturers are already in the planning stage for vehicles that
`will be introduced in the 2005 model year and later.
`
`For more than a year, automakers have viewed MOST as a
`candidate. The system, created by the MOST Cooperation
`(Karlsruhe, Germany), uses a 25-Mbit/second fiber-optic bus.
`Partners in the Cooperation include Audi, BMW, DaimlerChrysler,
`Harman/Becker and Oasis Silicon Systems.
`
`Previously, AMI-C members had said that MOST didn't meet the
`requirements of the consortium's charter, which calls for
`technologies to be "open and royalty-free." At the Convergence
`f
`i D t
`it l
`t
`th h
`MOST
`d th t it
`http://www.eetimes.com/document.asp?doc_id=1142604
`
`Most Recent Comments
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`realjjj It's interesting as, in a world
`where all our computers are
`AR/MR/VR glasses, everything will
`be a simulation. Let's call it a
`Reality Emulation OS.
`
`9/20/2017
`5:13:17 PM
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`9/20/2017
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`Automakers pick MOST as high-speed in-car bus | EE Times
`conference in Detroit last month, however, MOST announced that it
`would eliminate its connection fee of 0.3 Euro per device. The
`Cooperation's members have also agreed to make all parts of the
`MOST specification open and available.
`
`"Since they made it open and they made it free, we expect to have
`no problems with the endorsement," Noblett said.
`
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`Several automakers have already incorporated MOST technology
`into upcoming vehicle programs, typically in luxury cars. BMW will
`use it in a vehicle to be released next year. Audi and
`DaimlerChrysler have also said they are integrating the MOST bus
`into production vehicles.
`
`At last week's ITS World Congress in Turin, other carmakers —
`including Ford, Jaguar and Volkswagen — demonstrated vehicles
`containing MOST technology. The technology is also expected to
`be used by a major American vehicle manufacturer in an upcoming
`program.
`
`Engineers said that automakers are showing a growing interest in
`the MOST bus because it offers far higher data rates than buses
`based on controller-area network (CAN) technology, which is
`commonly used in today's vehicles for such chores as power-train
`control. IDB-C (Intelligent Transportation Systems Databus-CAN),
`for example, offers speeds of about 250 kbits/s, about 100 times
`slower than MOST. As a result, such CAN-based buses are
`expected to give way to fiber-optic networks in multimedia
`applications, although they will continue in their roles under the
`hood.
`
`Up to now, however, many automakers have maintained allegiance
`to CAN, even for multimedia, in part because of the lower costs of
`the copper-based bus. MOST members said they expect that to
`change, as automotive multimedia applications take off.
`
`"The first few production applications will be luxury vehicles," said
`Henry Muyshondt, general manager for business development at
`Oasis Silicon Systems AG (Karlsruhe, Germany). "But it will migrate
`downward through the vehicle lines as volume builds up."
`
`MOST members also expect the bus to move beyond the European
`market that developed it. Muyshondt noted out that Ford, Toyota
`and Nissan are members of the MOST Cooperation.
`
`AMI-C members said the endorsement of MOST would not
`preclude endorsing another high-speed bus. "At one time, we were
`going to endorse only a single high-speed network, but that's not
`the plan anymore," said Edward Nelson, a Ford technical specialist
`and system team leader for AMI-C.
`
`Room for two
`
`Indeed, most AMI-C members expect IDB-1394, a high-speed bus
`based on the 1394 computer industry standard, to get the
`consortium's nod, after some aspects of the spec are brought up to
`"automotive grade."
`
`Automotive engineers say the two data buses don't necessarily
`compete with each other and that in some cases, vehicles could
`combine a 1394 access port with a MOST network.
`
`Many engineers like 1394 because it is compatible with
`camcorders, video players, DVD systems and other consumer gear
`that might eventually plug into vehicles. Some engineers are
`hesitant, however, because unlike MOST, 1394 hasn't been fully
`proven out in rigorous automotive environments.
`
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