MOST Cooperation Provides New Physical Layer Specification

MOST has overhauled the Physical Layer Specification: Based on lessons-learned of today's MOST25 networking generation, a working group consisting of car, device and component makers has developed a new Physical Layer Specification for MOST150.

The MOST Cooperation - the organization through which the leading automotive multimedia network Media Oriented Systems Transport (MOST) is standardized - has overhauled the Physical Layer Specification: Based on lessons-learned of today's MOST25 networking generation, a working group consisting of car, device and component makers has developed a new Physical Layer Specification for MOST150. The specification is available to members of the MOST Cooperation as part of the MOST Rev. 3.0 specification set and can be used for implementation into products.

An integral approach was used to define the electrical and optical signal parameters for MOST150 as well as cost optimized standardized packages together with pin-out descriptions for optoelectronic converters. The specification addresses the challenges of soldering processes, changeability of fiber-optic elements with alternative replacements, as well as new opportunities to organize supply chains of components. Unambiguous signal definitions for operational states, power supply ramp-up and ramp-down scenarios, together with the use of established eye diagram testing methods, well known from the data- and telecom industry, safeguard an easy and robust development process.

MOST150 uses the well-known and established MOST25 1mm step index POF polymer fiber. The mechanical interface at the wire harness connector stays the same, only the optoelectronics are adapted to the new speed grade. By design, most of the elements of this new MOST150 specification can be carried over to future, cost optimized MOST25 generations.

Later in 2008, the working group will define the updated compliance process to test products for conformance to these requirements. This process will be carried over from MOST25 and will be enhanced with reliability testing methods.

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 fiber or electrical unshielded or shielded twisted pair wire physical layers, that meet automotive environmental requirements. Today MOST is used in over 55 car models as the communication backbone for their information and entertainment equipment.

About MOST Cooperation

The MOST Cooperation 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 75 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/Becker and SMSC are its core partners and constitute its Steering Committee. For more information see www.mostcooperation.com.