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近年来,随着光纤传输设备费用的下降,光纤局域网的发展也得到了推动。目前美国在局域网中使用光缆的比例已占局域网总数的(4～5)%,预计到1991年将上升到20%。光纤局域网的标准化工作也正被FOTAG(Fiber Optic Task Advis-ory Group)积极考虑之中。各种型式的光纤以太网(无源星形结构,有源星形结构,
In recent years, with the decline in the cost of optical fiber transmission equipment, the development of optical fiber LAN has also been promoted. At present, the proportion of optical cables used in the LAN in the United States accounts for 4% to 5% of the total number of local area networks and is expected to rise to 20% by 1991. Fiber LAN standardization is also being actively considered by FOTAG (Fiber Optic Task Advis-ory Group). Various types of fiber Ethernet (passive star structure, active star structure,