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ITS VIDEO AND HIGH SPEED DATA OVER TELEPHONE LINES.
| 题名： | ITS VIDEO AND HIGH SPEED DATA OVER TELEPHONE LINES. |
| 作者： | Cain-Carl-W; Biesecker-Keith-J |
| 关键词： | data-transmission-systems; traffic-control; traffic-surveillance |
| 摘要： | Asymmetric DSL (ADSL) is uniquely different from other DSL (digital subscriber line) technologies; it is designed to support asymmetric traffic and to operate over twisted pair currently being used for telephone service. ADSL transmits with downstream speeds capable of supporting several compressed video signals over distances up to 3.4 miles. The ADSL upstream data rates are sufficient to handle all of the control information required (e.g., pan, tilt, zoom). The spectrum used by ADSL is well above that used by both telephones and baseband modems, leaving the analog telephone service (or controller to controller communications) independent and undisturbed. Therefore ADSL technology provides the potential to multiplex traffic video signals over the existing twisted pair infrastructure currently used for freeway management and traffic control. This provides an interesting alternative for DOTs that may be planning to lease communications or install fiber-optic cable for video and are considering using limited motion video to reduce communications costs. This paper describes xDSL technologies and a potential ADSL application involving video surveillance for traffic control and freeway management operations. However, current ADSL products are designed for video and data dissemination rather than collection. As an emerging technology, proof-of-concept demonstrations and testing are needed for transportation systems over both owned and leased lines. Actual field implementations may require a custom installation until modifications are made to the product base offered by ADSL modem manufacturers. Field trials have occurred for residential applications, but transportation applications such as those described in this paper are untested. |
| 总页数： | ITS America. Meeting (8th : 1998 : Detroit, Mich.). Transportation technology for tomorrow : conference proceedings. 1998. pp16 |
| 报告类型： | 科技报告 |
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