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    • 9. 发明授权
    • Ethernet extender
    • 以太网扩展器
    • US5436902A
    • 1995-07-25
    • US223209
    • 1994-04-05
    • Robert P. McNamaraAmar Amar
    • Robert P. McNamaraAmar Amar
    • H04L12/46H04L12/66
    • H04L12/4604
    • A telecommunication bridge system uses synchronized arbitration in a portion of a frame of a Radio Frequency (RF) subsystem and is transparent to Ethernet layer protocols and Ethernet-type packets in order to increase bandwidth utilization and effectively extend Ethernet networks to metropolitan-area-wide application. The telecommunication bridge system comprises an enhanced Ethernet network interface subsystem coupled to a conventional Ethernet medium and a control subsystem including an RF modem, in turn coupled to a frame synchronized RF medium in a metropolitan-sized network. On one side the control subsystem emulates all Ethernet layer protocols and on the other side conducts a prioritized arbitration scheme during only a portion of a time division multiplexed frame, the remainder of the frame for carrying a payload of unmodified packets to other bridges. Included in the controller subsystem is a two-way Manchester/NRZ Code converter, its own intelligence and packet buffering using a microprocessor and random access memory.
    • 电信桥系统在射频(RF)子系统的帧的一部分中使用同步仲裁,并且对以太网层协议和以太网类型分组是透明的,以便增加带宽利用率,并有效地将以太网网络扩展到大都市区域 应用。 电信桥系统包括耦合到常规以太网介质的增强型以太网网络接口子系统和包括RF调制解调器的控制子系统,其又耦合到大都市网络中的帧同步RF介质。 一方面,控制子系统模拟所有以太网层协议,另一方面在仅在时分多路复用帧的一部分期间执行优先级仲裁方案,用于将未修改分组的有效载荷携带到其他网桥的剩余帧。 控制器子系统中包含一个双向曼彻斯特/ NRZ代码转换器,其自身的智能和数据包缓冲使用微处理器和随机存取存储器。