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美国旧金山海湾地区快速交通系统(BART)已计划耗资0.445亿美元在它的整条地铁隧道中敷设一条127km长的光纤网.MFS网络技术公司获得其中0.385亿美元的合同,设计和敷设光纤网以及为地下接口设计的800MHz无线电中继系统.MFS将在整条地铁中敷设一条直径为0.76m的电缆管,该管内再放置4根内管(0.25m),每根内管容纳48根光纤,故BART共有192根光纤.其中一根内管(48根光纤)供交通系统自用.其余3根内管(144根光纤)供其它用户使用,并在15年内将这3根内管所得收入的90%用来付清欠债,15年后收入就归交通系统.该网建成后仍由MFS管理,并使MFS获得10%的收入.
The U.S. San Francisco Bay Area Rapid Transit System (BART) has plans to spend $ 0.445 billion to lay a 127-kilometer optical fiber network across its entire metro tunnel, with MFS Network Technologies receiving $ 38.5 million in contracts, designing and laying fiber networks and 800MHz Radio Relay System Designed for Underground Interfaces. MFS will lay a 0.76m diameter cable in the entire metro tube, placing four further inner tubes (0.25m) each containing 48 fibers, So BART has a total of 192 optical fibers, one of the inner tubes (48 optical fibers) for own use by the transportation system, and the other three inner tubes (144 optical fibers) for use by other users and the revenue from these three inner tubes Ninety percent are used to pay off their debts and 15 years later they are paid into the transit system, which is still managed by MFS once it is completed and 10% of MFS’s revenue.