Issue: Mar 2012


In-car Ethernet Enters the Road



MOST® Cooperation Releases Automotive Ethernet into Series Production

by Lenny Case

The MOST Cooperation (MOSTCO) - the standardization organization for the leading automotive multimedia network Media Oriented Systems Transport (MOST) - proudly announces that automotive Ethernet via MOST is now making its way into the car and onto the roads. "With the current MOST150 rollout, the MOST Cooperation is adding the transmission of Ethernet protocol data to the established MOST infotainment transport of audio and video within the car," explained Dr. Christian Thiel, MOST Cooperation Administrator. "Thus, the Ethernet Channel of MOST150 is equivalent to an IEEE802.x network. MOST150 combines Ethernet technology with a networking technology that was designed to meet the stringent automotive requirements. MOST provides the ideal network backbone for a broad variety of IP-based applications such as supporting apps on connected services and Internet access in general."

The MOST network technology is extremely flexible, allowing star, daisy-chain, tree, and other topologies implemented on different physical layers such as POF (plastic optical fiber) and electrical physical layers: coax and shielded or unshielded twisted pair (STP/UTP) copper wires. The coax standard has recently been specified to serve other vehicle domains, i.e. it fits into the driver assistance domain, as this physical layer is able to provide bi-directional communication and power supply on the same cable. Regarding content protection, HDCP (High-Bandwidth Digital Content Protection) has been added in addition to DTCP (Digital Transport Content Protection). With these, MOST fulfills the present and will fulfill foreseeable future copy protection requirements for upcoming rights management and copy control systems.

Bandwidth for Ethernet transport exceeds 100 Mbit/s

The MOST Ethernet Channel provides the necessary infrastructure to implement all necessary protocols and mechanisms such as the Internet Protocol (IP), the Transmission Control Protocol (TCP), or the Hypertext Transfer Protocol (HTTP) which are required to support Internet access in a distributed infotainment system. Simultaneously, MOST maintains other essential communication features, such as synchronous and isochronous channels for easy and efficient audio and video streaming. The MOST150 network provides an efficient and easy to use solution for transmitting IP traffic. Investigations on the throughput with the maximum bandwidth allocated for the packet channel proved that a net bandwidth of over 107 Mbit/s can be achieved, showing that the maximum bandwidth of 142.8 Mbit/s can be utilized with efficiency of over 75 percent.

About MOST Technology

MOST (Media Oriented Systems Transport) is a multimedia networking technology optimized for use in cars and other applications. It enables the transport of high Quality of Service audio and video together with packet data and real-time control over a single transmission medium. MOST can use plastic optical fibers (POF), coax based electrical physical layer, and shielded and unshielded twisted pair (STP/UTP) copper wires that meet automotive environmental requirements. Today, MOST is used in over 115 car models as the communication backbone for their information and entertainment equipment.

About MOST Cooperation

The MOST Cooperation (MOSTCO) is the organization through which MOST Technology is standardized and refined so that it continues to stay abreast of the latest industry requirements. Today it consists of 16 international carmakers and more than 60 key component suppliers. They have joined together to work with the MOST Technology and to contribute to its innovation. The MOST Cooperation is prepared to embrace efforts to further develop and standardize the technology for other industries and to establish the corresponding work structures. The MOST Cooperation was founded in 1998 to standardize MOST Technology as a global standard for multimedia networking. Audi, BMW, Daimler, HARMAN and SMSC are its core partners and constitute its Steering Committee. For more information see http://www.mostcooperation.com

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