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AN INNOVATIVE, ETHERNET-BASED COMMUNICATIONS NETWORK ARCHITECTURE FOR INTEGRATED TRANSPORTATION MANAGEMENT SYSTEMS.
| 题名： | AN INNOVATIVE, ETHERNET-BASED COMMUNICATIONS NETWORK ARCHITECTURE FOR INTEGRATED TRANSPORTATION MANAGEMENT SYSTEMS. |
| 作者： | Gettman-D; O'Keeffe-D; Aguigui-K; Tighe-W; Van-Dillen-D; Cormier-B |
| 关键词： | Architecture-; Closed-circuit-television; Communication-systems; Field-tests; Innovation-; Integrated-systems; Internet-; Management-information-systems; Network-analysis-Planning; San-Francisco-California; San-Francisco-Bay-Area; Traffic-signal-controllers; Transportation-planning |
| 摘要： | This paper describes an innovative, end-to-end Ethernet-based communications network architecture designed for highly reliable, fault-tolerant communications between a central transportation management center (TMC) and field devices (traffic signal controllers, closed circuit television (CCTV) cameras, changeable message signs, etc.). The concept of operations driving the development of the architecture is the Integrated Transportation Management System currently being developed and implemented for the City and County of San Francisco by DKS Associates and Siemens-GTS. The architecture consists of three-levels with multiple degrees of redundancy to ensure continuous communications between field devices and the TMC in an environment (i.e. city streets) where accidental cuts to underground infrastructure are routine. At the first level, each field cabinet houses a field-hardened Ethernet switch that connects the field devices to the communications system. The field-hardened Ethernet switches are then connected to two geographically separate distribution switches via single-mode fiber - one as the primary communications link to the TMC and one as a backup. These distribution ("middle") switches constitute the second level of the communications architecture. The design calls for middle switches operating at wire-speed with the capacity to handle full non-blocking communications for up to 40 connections (ports) as well as all of the network data from a lateral connection to an identical middle switch. Each middle switch is also requires to have full non-blocking forwarding of video feeds of up to 320 cameras at 3mbps quality using MPEG2. Middle switches are placed in the field in climate-controlled hub cabinets and linked back to a central switch located at the TMC. A back up central switch is located at a separate facility. The links between the field hubs and the TMC operate at gigabit speed. The central switch at the TMC is an enterprise-class device with expansion capabilities up to 64 gigabit ports and wire-speed backplane. Fault tolerance and data reliability is provided by standard Quality of Service (IEEE 802.1P) and Spanning Tree (IEEE 802.1D) Ethernet protocols. The architecture was tested and demonstrated at the Extreme Networks Interoperability Laboratory in Santa Clara, CA and was found to be a viable alternative to ATM, SONET, frame relay, and other networking technologies. |
| 总页数： | Conference Title: 9th World Congress on Intelligent Transport Systems. Location: Chicago, Illinois. Sponsored by: ITS America, ITS Japan, ERTICO (Intelligent Transport Systems and Services-Europe). Held: 20021014-20021017. 2002. pp13 |
| 报告类型： | 科技报告 |
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