Electronics & Connectivity - September 5, 2012 - 9

Traditional in-car networking technologies (left and middle) provide a communications bus, with all attached units sharing available bandwidth. Modern Ethernet-based networks (right) function via switches, so available bandwidth is not necessarily shared.

Ecosystem for Ethernet-based communication

Incentives and multisourcing

Next to being a conceptually suitable solution, Ethernet-based communication in automotive has to have a functioning ecosystem. This means that there needs to be an incentive to use the technology, and there have to be multiple vendors as well as a market for enabling and supporting technologies. Additionally, the technology has to fulfill the two basic requirements of every successful technology: technical functionality and the possibility of future development (see image on page 10). Cars are physically challenging environments, in which a multitude of very different applications are used in a limited space. Next to having automotive qualified parts available (ICs, connectors, cables), the networking solution needs to pass emission and immunity requirements. For Ethernet-based communication over UTSP cabling, these requirements can be fulfilled. QoS (Quality of Service) can be realized with the help of the IEEE AVB (audio video bridging) standard(s). Security can be supported by IEEE 1722 VLANs (virtual local area networks), IP addressing concepts, and the usual encryption and other protection methods applied in Ethernet/IP networks.
SAE electronics+connectivity

There are two main incentives to adopt a new technology: cost reduction and/or the enabling of new, desirable functionality. For UTSP Ethernet-based communication in cars, both are givens. The solution is cost-efficient in comparison to technologies that need shielded cabling (like LVDS, USB, 100base-TX) or optical cabling (like MOST), and it is also a cost-efficient solution for new applications requiring 100-Mbps bandwidth. The auto industry is actually not quite as averse to a single source monopolist as might be expected. It seems to be easier to influence just one manufacturer into providing very specific functionality than having a whole standardization consortium to submit to these requests. Nevertheless, a lot more confidence is put into markets with multiple suppliers, as it promises a self-enhancing cycle of cuttingedge products at attractive prices, without the risk of one manufacturer dropping out. To have multiple suppliers requires that the used technology is accessible to different vendors. The only protocol level on which sourcing is at all something to discuss for Ethernet-based communication in automotive is the physical layer, because of the specific immunity and emission
September 5, 2012

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Electronics & Connectivity - September 5, 2012

Table of Contents for the Digital Edition of Electronics & Connectivity - September 5, 2012

Electronics & Connectivity - September 5, 2012
Contents
The Ups and Downs of Connectivity
Tech Report
Securing IT in the sky
Data Collection Made Easy
Ad Index
Resource Links
Upcoming from the Editors
Electronics & Connectivity - September 5, 2012 - Cover1
Electronics & Connectivity - September 5, 2012 - Electronics & Connectivity - September 5, 2012
Electronics & Connectivity - September 5, 2012 - Contents
Electronics & Connectivity - September 5, 2012 - The Ups and Downs of Connectivity
Electronics & Connectivity - September 5, 2012 - Tech Report
Electronics & Connectivity - September 5, 2012 - 5
Electronics & Connectivity - September 5, 2012 - 6
Electronics & Connectivity - September 5, 2012 - 7
Electronics & Connectivity - September 5, 2012 - 8
Electronics & Connectivity - September 5, 2012 - 9
Electronics & Connectivity - September 5, 2012 - 10
Electronics & Connectivity - September 5, 2012 - 11
Electronics & Connectivity - September 5, 2012 - 12
Electronics & Connectivity - September 5, 2012 - 13
Electronics & Connectivity - September 5, 2012 - Securing IT in the sky
Electronics & Connectivity - September 5, 2012 - 15
Electronics & Connectivity - September 5, 2012 - 16
Electronics & Connectivity - September 5, 2012 - 17
Electronics & Connectivity - September 5, 2012 - 18
Electronics & Connectivity - September 5, 2012 - 19
Electronics & Connectivity - September 5, 2012 - Data Collection Made Easy
Electronics & Connectivity - September 5, 2012 - 21
Electronics & Connectivity - September 5, 2012 - 22
Electronics & Connectivity - September 5, 2012 - 23
Electronics & Connectivity - September 5, 2012 - 24
Electronics & Connectivity - September 5, 2012 - Upcoming from the Editors
https://www.nxtbook.com/nxtbooks/sae/12DEC1128
https://www.nxtbook.com/nxtbooks/sae/12DEC0905
https://www.nxtbook.com/nxtbooks/sae/12DEC0530
https://www.nxtbook.com/nxtbooks/sae/12DEC0301
https://www.nxtbook.com/nxtbooks/sae/ec_prototype
https://www.nxtbookmedia.com