电子信息工程外文翻译--综合布线的未来（适用于外文翻译+中英文对照）.doc

w 毕业设计 外文文献及译文 文献、资料题目:The future of structure cabling systems 文献、资料来源: Cabling Installation Maintenance Magazine 文献、资料发表（出版）日期: 2005.12.1 院（部）: 信息与电气工程学院 专 业: 电子信息工程 班 级: 姓 名: 学 号: 指导教师: 翻译日期: 2012.4.1 w 外文文献： The future of structured cabling systems Which technologies will meet speed and data-transmission requirements in the future? To discuss the future of structured cabling systems, we should spend a moment looking at the past and present practices. Before early 1984, communications wiring systems, as they were then called, were not topics of much discussion. Data-transport speeds were comparatively slow, transmission bandwidth requirements were minimal, and others provided the design and installation of the cabling system. The telephone companies took care of the installation and maintenance of the telephone service. When data services became distributed, the cabling system was vendor-specific, and the installation and maintenance of the cable plant was provided by the equipment vendors, or specialized independent contractors. In January 1984, the courts in the U.S. made several important rulings that changed the way telecommunications was provided and distributed. Outside of traditional suppliers of cabling systems, not much was understood about the cabling requirements for communications transport. The proliferation of media and connector interfaces, a lack of standard transmission specifications, and the introduction of cabling schemes by vendors added to the users confusion. Bringing order to the confusion and creating generic cabling systems demanded the creation of a standards body whose output would focus on commercial buildings and communications cabling. Since the introduction of the first cabling standard in199