MOST150 embraces coax cable

April 07, 2011 // By Christoph Hammerschmidt
The MOST Cooperation - the standardization organization for the automotive multimedia network Media Oriented Systems Transport (MOST) - has released the MOST150 Electrical Physical Layer Sub-Specification Rev. 1.0 based on coaxial cable.

The MOST150 coax physical standard complements the existing MOST150 optical physical layer in the infotainment domain. This could be particularly interesting for customers with have stringent preferences in the electrical physical layer, said Wolfgang Bott, Technical Coordinator of the MOST Cooperation. In addition, the coax PHY is intended to open the way into other vehicle domains. "For instance, 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," Bott explained.

According to the MOST Cooperation, the coax specification was derived in a straight forward process from the existing MOST Physical Layer Basic Specification. Its principal structure is similar to the existing MOST150 optical physical layer specification. Both physical layers are interoperable: MOST150 supports various physical layers and enables various topology options.The properties of the MOST150 optical physical layer are maintained. 

Figure: MOST coax transmission line. For full resolution, click here.

MOST150 is a multi-channel network (control data, synchronous and packet channel) which allows the simultaneous usage of these services through one network. It provides an isochronous channel for video data transmission, among others. It also enables IP data communication, providing the automotive-ready Ethernet channel according to IEEE 802.3. with configurable bandwidth from 0 to nearly 150 Mbit/s. MOST150 supports the safety layer concept to enable fail-safe application up to SIL level 3 according to IEC 61508 and ASIL C according to ISO 26262. Meeting these requirements, and due to its inherent synchronicity, the MOST standard provides an effective and cost-efficient network solution that is resilient and future-proof.

For more information, visit http://www.mostcooperation.com