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原文传递 Application of Various Digital Subscriber Line (xDSL) Technologies to ITS: Traffic Video Field Assessments

题名：	Application of Various Digital Subscriber Line (xDSL) Technologies to ITS: Traffic Video Field Assessments
作者：	Biesecker, K. ; Charleston, G.
关键词：	Telecommunications; Field tests; Videotapes; Traffic management; Transportation industry; Traffic control devices; Technology
摘要：	Various digital subscriber line (xDSL) technologies are those methods used to implement high-speed data services (e.g., 2 Mbps Frame Relay) on a twisted pair (wire) communications medium. They are also considered strong candidates for rapidly deploying Intelligent Transportation Systems (ITS) services over existing communications infrastructure. ITS applications such as freeway surveillance video were untested. The paper documents the final phase of a Federal Highway Administration (FHWA) study to assess the application of xDSL technologies to ITS, particularly their use for 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 tests were used to demonstrate the prototype's capabilities in an operational environment.
总页数：	98p
报告类型：	科技报告