United States Department of Transportation
i
Application of Various Digital Subscriber Line (xDSL) Technologies to ITS: Traffic Video Field Assessments
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1999-06-12
[PDF-3.60 MB]
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Abstract:Various digital subscriber line (xDSL) technologies are those methods used to implement high-speed data services e.g.,2Mbps Frame Relay) on a twisted pair (wire) communications medium. They are also considered strong candidates for rapidly employing Intelligent Transportation Systems (ITS) services over existing communications infrastructure. For example, xDSL technologies provide the potential to integrate full motion traffic video over the twisted pair currently used by many traffic control systems.
Commercially available xDSL products and services exist, and field trials have occurred for the more popular applications, including Internet access and video on-demand. However, ITS application such as freeway surveillance video were untested. Although xDSL technologies offer great potential for ITS, they remain largely unknown to the transportation community, and further evaluation was required.
This paper documents the final phase of a Federal Highway Administration (FHWA) study to assess the application of xDSL technologies to ITS, particularly their use of traffic video. This is an addendum to "The Application of Various Digital Subscriber Line (xDSL) Technologies to ITS: Traffic Video Laboratory Assessments"--an earlier report that provides a general understanding of the various DSL technologies and describes the concept of xDSL-based traffic video. This supplement documents the field testing of an xDSL-based traffic video prototype that was built during the laboratory studies. In addition to validating laboratory findings, field test were used to demonstrate the prototype's capabilities in an operational environment.
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