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    • 2. 发明授权
    • Modulation and demodulation system employing AM-PSK and QPSK
communication system using digital signals
    • 采用数字信号采用AM-PSK和QPSK通信系统的调制解调系统
    • US5084903A
    • 1992-01-28
    • US631760
    • 1990-12-21
    • Robert P. McNamaraTimothy P. MurphyJames C. Long
    • Robert P. McNamaraTimothy P. MurphyJames C. Long
    • H04L12/28H04L27/00
    • H04L12/2801H04L27/00
    • A communication network having a first broadband communications channel or transmitting bus and a second broadband communications channel or receiving bus, wherein the first broadband communications channel passes information upstream to a head end employing an offset quadrature phase shift keyed (OQPSK) modulator in bursts, and the second broadband communications channel passes information downstream from the head end to remote nodes in a continuous bit stream. All nodes of the system are coupled to both the first communications channel and the second communications channel. According to the invention, modulation of signals applied to the first communication channel is optimized for burst communication from a plurality of sources to central control at the head end, and modulation applied to the second communications channel is optimized for continuous communication from the central source to a target node. In one specific embodiment, the communication between the central unit (head end) and any one of a choice of target nodes through the second communication channel is by means of three-level class one partial response AM-PSK modulated onto a carrier, which is optimized for continuous operation.
    • 一种具有第一宽带通信信道或发射总线和第二宽带通信信道或接收总线的通信网络,其中所述第一宽带通信信道使用脉冲串中的偏移正交相移键控(OQPSK)调制器将信息上行传送到头端,以及 第二宽带通信信道以连续比特流将信头从头端向下游传送到远端节点。 系统的所有节点都耦合到第一通信信道和第二通信信道。 根据本发明,适用于第一通信信道的信号的调制被优化用于从头部到多个源到中央控制的突发通信,并且对从第二通信信道到第二通信信道的连续通信优化用于从中央源到 目标节点。 在一个具体实施例中,中央单元(头端)和通过第二通信信道的目标节点的选择中的任一个之间的通信是通过调制到载波上的三级一类部分响应AM-PSK来实现的, 优化连续运行。
    • 3. 发明授权
    • Modulation and demodulation system employing AM-PSK and FSK for
communication system using digital signals
    • 使用AM-PSK和FSK的调制解调系统用于使用数字信号的通信系统
    • US5088111A
    • 1992-02-11
    • US317214
    • 1989-02-28
    • Robert P. McNamaraTimothy P. Murphy
    • Robert P. McNamaraTimothy P. Murphy
    • H04L12/28H04L25/34H04L27/00
    • H04L27/00H04L12/2801
    • A communication network having a first broadband communications channel or transmitting bus and a second broadband communications channel or receiving bus, wherein the first broadband communications channel is for passing information upstream to a head end and the second broadband communications channel is for passing information downstream from the head end to remote nodes. All nodes of the system are coupled to both the first communications channel and the second communications channel. According to the invention, modulation of signals applied to the first communication channel is optimized for burst communication from a plurality of sources to central control at the head end, and modulation applied to the second communications channel is optimized for continuous communication from the central source to a target node.
    • 一种具有第一宽带通信信道或发射总线和第二宽带通信信道或接收总线的通信网络,其中所述第一宽带通信信道用于将信息上行传送到头端,并且所述第二宽带通信信道用于将信息下行 头端到远程节点。 系统的所有节点都耦合到第一通信信道和第二通信信道。 根据本发明,适用于第一通信信道的信号的调制被优化用于从头部到多个源到中央控制的突发通信,并且对从第二通信信道到第二通信信道的连续通信优化用于从中央源到 目标节点。
    • 8. 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。