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本文介绍一种价格低廉的数模混合光纤环形综合业务局域网。我们将统一的光纤网分解为数字数据传输子网和模拟电视传输子网两部分。数字子网速率为20Mb/s,采用报文分组交换和令牌环介质访问方式。模拟子网采用副载波多路复用传输多路电视信号和频道分配交换方式。模拟网的交换功能受数字网控制,使网络的构成简化并降低了成本。
This article describes a low-cost digital-analog hybrid fiber ring integrated services LAN. We split the unified optical network into digital data transmission subnet and analog TV transmission subnet in two parts. Digital subnet rate of 20Mb / s, using packet switching and token ring media access. Analog sub-network using subcarrier multiplexing transmission of multi-channel television signal and channel allocation exchange. The switching of the analog network is controlled by the digital network, simplifying the network and reducing the cost.