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News Release from: MOST Cooperation
Edited by the Electronicstalk Editorial
Team on 25 March 2008
Specification boosts bandwidth
efficiency
The MOST Specification Rev 3.0 allows a bandwidth of 150Mbit/s, an isochronous transport mechanism to support video applications, and an Ethernet channel for transporting packet data.
The MOST Cooperation has created MOST Specification Rev 3.0 for the next-generation infotainment backbone While the specification is independent of speed grade, it can already work with the newly defined MOST150 physical layer
This article was originally published on Electronicstalk on 17 Oct 2007 at 8.00am (UK)
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It enables the use of a bandwidth of 150Mbit/s, an isochronous transport mechanism to support extensive video applications, as well as an Ethernet channel for efficient transport of IP-based packet data.
The MOST Specification Rev 3.0 provides the specification for audio and video signals to be transported with high bandwidth efficiency and without any overhead for addressing, collision detection/recovery or broadcast.
It offers capacity that packet-switched networks can only achieve with much higher gross bandwidth.
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MOST150 enables direct isochronous transport of MPEG video streams without bit-stuffing or transcoding.
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Multiple high-definition (HD) video streams and multichannel surround sound with premium quality of service can be transmitted, while simultaneously moving high loads of packet data around.
MOST Specification Rev 3.0 adds Ethernet and isochronous channels to the well known channels for synchronous, packet and control data channels of previous specification versions.
The Ethernet channel can transport unmodified Ethernet frames according to IEEE802.3.
This permits software stacks and applications from the consumer and IT domain, where the speed of innovation is much faster, to be seamlessly migrated into the car.
TCP/IP stacks or protocols using TCP/IP can communicate via MOST without any modification.
Thus, the new generation of MOST provides the automotive-ready physical layer for Ethernet in the car.
In addition, MOST Specification Rev 3.0 offers an isochronous channel to support streams which are not synchronised to the MOST frame rate.
A typical use is the transport of MPEG streams over a MOST network, since MPEG streams generally use a variable bit rate.
The MOST Specification Rev 3.0 also adds significant enhancements to the control channel (which is used for real-time control of devices) by doubling the bandwidth compared to MOST25.
Emphasis has been put on clear specification points where conformance can be easily verified during compliance testing.
Diagnosability has been optimised by an overhaul of ring break diagnosis behaviour as well as detection of sudden signal-off.
The robustness of the procedures has been verified during the early phase of the specification using failure mode effects analysis (FMEA) as well as reference implementations through virtual prototypes.
To verify ring break diagnosis behaviour the functional and timing behaviour was modeled and executed in over 100,000 test sets that use well-known methods from system-on-chip (SoC) verification.
Existing applications can easily be re-used in the new network by modifying their network interfaces.
MOST Specification Rev 3.0 supports the MOST150 Physical Layer, with a bandwidth of 150Mbit/s that allows carmakers to continue to use POF and LEDs as light sources.
They can continue to use their established optical wire harness and assembly processes.
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