Commercial Operations

This paper describes  in detail  some of the essentials of the  Ethernet  standard, common
misconceptions of the technology, and key issues that need to be addressed prior to deployment of it for  Intelligent Transportation Systems.  Since Ethernet is the most prevalent networking standard in the world today due to its flexibility, reliability and cost effectiveness, it is these same features that have made Ethernet a solid choice for many ITS communications networks being implemented in the new millennium.  However, there are certain portions of the standard that are actually constraining for ITS networks, but innovative techniques and methods of implementation enable ITS engineers to maintain compliance with the standard while accommodating the  rigorous  demands of ITS communications networks.  Some of these constraints include transmission distances, the CSMA/CD algorithm, and the fact that many ITS field devices are not “Ethernet-ready”, or Ethernet devices are not “ITS ready”.   Another constraining factor includes the lack of environmental, shock and vibration  tolerance for outdoor applications with most Ethernet gear.  Cities such as San Francisco, California, Orlando, Florida and Arlington, Texas are utilizing it for their new city-wide ITS networks, and many others are considering it as part of their ITS Master Plans.

DKS Associates

City and County of San Francisco

Presented at the ITS America Annual Conference and Exposition, April 26 - 28, 2004 San Antonio, Texas