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1. 发明授权

US06650839B1 Method and apparatus for optical media access protection in a passive optical network 有权
标题翻译：无源光网络中光学介质访问保护的方法和装置
公开(公告)号：US06650839B1
公开(公告)日：2003-11-18
申请号：US09576668
申请日：2000-05-23
申请人： William C. Mallard, Jr. , Colby Dill, III
发明人： William C. Mallard, Jr. , Colby Dill, III
IPC分类号： H04B1008
CPC分类号： H04B10/079
摘要： An apparatus and method is disclosed for protecting access to a shared medium in an optical communications system which has plural remote terminals coupled to a central terminal over the shared medium. According to one aspect, if an optical transmitter for an individual remote terminal is active for a first prescribed time interval when it has not been enabled for such transmission, the optical transmitter is disabled. According to another aspect, the continuous time that an individual terminal is enabled to transmit onto the shared medium is monitored. If the enabled transmission for the individual terminal exceeds a second prescribed time interval, the optical transmitter for the individual terminal is disabled.
摘要翻译：公开了一种用于保护对具有通过共享介质耦合到中央终端的多个远程终端的光通信系统中的共享介质的访问的装置和方法。根据一个方面，如果用于单个远程终端的光发射机在尚未被启用用于这种传输的情况下对于第一规定时间间隔有效，则光发射机被禁用。根据另一方面，监视单个终端能够传送到共享介质上的连续时间。如果单个终端的使能传输超过第二规定时间间隔，则单个终端的光发射机被禁用。

2. 发明授权

US5408473A Method and apparatus for transmission of communication signals over two parallel channels 失效
标题翻译：通过两个并行通道传输通信信号的方法和装置
公开(公告)号：US5408473A
公开(公告)日：1995-04-18
申请号：US201704
申请日：1994-02-25
申请人： Jerry Hutchison , Simon A. Ginzburg , William C. Mallard, Jr.
发明人： Jerry Hutchison , Simon A. Ginzburg , William C. Mallard, Jr.
IPC分类号： H03M9/00 , H04L25/14 , H04J3/06
CPC分类号： H03M9/00 , H04L25/14
摘要： A technique for synchronizing run-length-limited data transmitted over two parallel narrowband communication channels, such as in a token ring local area network using fiber distributed data interface (FDDI) protocols. A serial data stream to be transmitted is demultiplexed onto the two channels by sending sequential blocks of equal numbers of bits over alternate channels. In a receiver-multiplexer, block boundary synchronization is established during connection initialization by using a property of a required HALT code to detect block boundaries received in each channel. Skew compensation is effected by comparing the times of detection of the block boundaries in the two channels, and appropriately controlling a variable delay in at least one of the channels. The technique establishes reliable block boundary synchronization and skew error compensation during connection initialization, and if there is subsequent loss of synchronization, detected transmission errors will eventually result in connection reinitialization and reestablishment of synchronization.
摘要翻译：一种用于同步使用光纤分布式数据接口（FDDI）协议在诸如令牌环局部区域网络中的两个并行窄带通信信道上传送的游程限制数据的技术。要发送的串行数据流通过在交替信道上发送相等数量的比特的顺序块来解复用到两个信道上。在接收机多路复用器中，通过使用所需HALT码的属性来检测在每个通道中接收的块边界，在连接初始化期间建立块边界同步。通过比较两个通道中的块边界的检测次数，并适当地控制至少一个通道中的可变延迟来实现偏移补偿。该技术在连接初始化期间建立可靠的块边界同步和偏移误差补偿，如果随后的同步丢失，检测到的传输错误将最终导致连接重新初始化和重新建立同步。

3. 发明授权

US5003556A Squelch circuit 失效
标题翻译：静噪电路
公开(公告)号：US5003556A
公开(公告)日：1991-03-26
申请号：US375036
申请日：1989-06-30
申请人： Robert A. Curtis , William C. Mallard, Jr.
发明人： Robert A. Curtis , William C. Mallard, Jr.
IPC分类号： H03G3/34 , H03K5/125 , H04B1/10 , H04L7/04 , H04L25/06
CPC分类号： H03G3/345 , H03K5/125 , H04B1/10 , H04L25/069 , H04L7/046
摘要： A squelch circuit is disclosed that distinguishes between noise impulses and valid packets of data transmitted over a transmission line such as a twisted pair media within a local area network. The squelch circuit converts supplied data into a stream of positive and negative pulses and detects a sequence of positive and negative pulses quantified in time based on prior knowledge of the characteristics of a valid packet of data and permits the supplied data to pass if it has the characteristics of a valid packet of data or prohibits the supplied data from passing if it does not have the characteristics of a valid packet of data.
摘要翻译：公开了一种静噪电路，其区分噪声脉冲和通过诸如局域网内的双绞线媒体的传输线传输的有效数据分组。静噪电路将提供的数据转换成正脉冲和负脉冲流，并且基于有效数据分组的特征的先验知识来检测在时间上定量的正脉冲和负脉冲的序列，并允许所提供的数据如果具有如果不具有有效的数据分组的特征，则有效数据分组的特征或者禁止所提供的数据通过。

4. 发明授权

US5315597A Method and means for automatically detecting and correcting a polarlity error in twisted-pair media 失效
标题翻译：用于自动检测和纠正双绞线介质极性错误的方法和手段
公开(公告)号：US5315597A
公开(公告)日：1994-05-24
申请号：US880455
申请日：1992-05-08
申请人： Henry S. Yang , William C. Mallard, Jr.
发明人： Henry S. Yang , William C. Mallard, Jr.
IPC分类号： H04L12/26 , H04L12/40
CPC分类号： H04L43/00 , H04L12/2602
摘要： A circuit for incorporation into LAN-compatible devices uses both the link integrity test (LIT) pulses and the end of frame delimiter (EOF) waveform information in received data transmissions to detect polarity errors on the twisted-pair media to which the devices are connected. The circuit integrates this information and a new auto-polarity detection/correction algorithm with the LIT algorithm of the IEEE 10 Base T standard to provide a stable and reliable twisted-pair link operation. Also, once the circuit is in its normal operational stage, it will not declare that a link is faulty unless it fails to receive a LIT pulse or an EOF waveform within a time-out period that is in accord with the IEEE standard. Therefore, the circuit is quite insensitive to line noise.
摘要翻译：用于并入LAN兼容设备的电路使用接收数据传输中的链路完整性测试（LIT）脉冲和帧定界符（EOF）波形信息的结尾来检测设备连接到的双绞线介质上的极性错误。该电路将该信息和新的自动极性检测/校正算法与IEEE 10 Base T标准的LIT算法集成，以提供稳定可靠的双绞线链路操作。此外，一旦电路处于正常的运行阶段，除非在与IEEE标准相符的超时周期内不能接收到LIT脉冲或EOF波形，否则不会声明链路故障。因此，电路对线路噪声非常不敏感。

5. 发明授权

US4931791A Shorted-coaxial-cable detector for local-area networks 失效
标题翻译：用于局域网的短路同轴电缆探测器
公开(公告)号：US4931791A
公开(公告)日：1990-06-05
申请号：US67104
申请日：1987-06-25
申请人： William C. Mallard, Jr.
发明人： William C. Mallard, Jr.
IPC分类号： G01R31/02 , H02H3/08 , H02H7/20 , H04B3/46 , H04L12/26 , H04Q1/00
CPC分类号： G01R31/025
摘要： A local-area-network device (10) includes a pulse detector (40), which detects positive-voltage pulses on the coaxial cable (14) of the local-area network. Such pulses occur when normal transmission signals reach a short circuit and are reflected. Upon detecting a positive pulse, the pulse detector (40) turns off a transistor switch (Q12) so as to remove power from the receive lines (22) of a receiver (20) in the device (10). Control circuitry (18) can thus conclude, from the simultaneous absences of a receive indication and of a collision indication, that a short circuit has occurred on the line.
摘要翻译：局域网设备（10）包括脉冲检测器（40），其检测局域网的同轴电缆（14）上的正电压脉冲。当正常传输信号达到短路并被反射时，会发生这种脉冲。在检测到正脉冲时，脉冲检测器（40）关闭晶体管开关（Q12），从而从装置（10）中的接收器（20）的接收线（22）移除电力。因此，控制电路（18）可以从接收指示和碰撞指示的同时缺席中断定线路上已发生短路。

6. 发明授权

US5838989A Common interface for a network having different communication media employing a carrier sense multiple access with collision detection (CSMA/CD) protocol 失效
标题翻译：具有使用具有冲突检测（CSMA / CD）协议的载波侦听多路访问的不同通信介质的网络的公共接口
公开(公告)号：US5838989A
公开(公告)日：1998-11-17
申请号：US560173
申请日：1995-11-17
申请人： Jerry D. Hutchison , Henry S. Yang , William C. Mallard, Jr.
发明人： Jerry D. Hutchison , Henry S. Yang , William C. Mallard, Jr.
IPC分类号： H04L12/413 , H04L12/44 , H04L29/06 , G06F13/00
CPC分类号： H04L12/40032 , H04L12/413 , H04L12/44 , H04L29/06 , H04L69/18
摘要： A switchable interface for conveniently coupling a network station of the CSMA/CD type to a network having any of a variety of communication media. The invention provides a single interface connector through which connection may be made directly to a twisted-pair medium, using the 10BASE-T protocol, or to a medium of a different type, through an AUI protocol and an appropriate media attachment unit. The interface connector has pin assignments chosen to minimize adverse effects of misconfiguring the station by connecting to a network having a protocol that is different from the one selected in the switchable interface. In one form of the invention, the switchable interface has the ability to determine the protocol being used by the network to which it is connected, and to switch the interface accordingly. Use of the common interface reduces station equipment cost and provides for increased user convenience, since only a single connector is needed to connect to a variety of media types.
摘要翻译：一种可切换接口，用于将CSMA / CD类型的网络站方便地耦合到具有各种通信介质中的任何一种的网络。本发明提供了一个单一接口连接器，通过AUI协议和适当的媒体连接单元，通过它可以使用10BASE-T协议或通过不同类型的介质将连接直接连接到双绞线介质。接口连接器具有选择的引脚分配，以通过连接到具有不同于在可切换接口中选择的协议的网络的网络来最小化错误地配置站的不利影响。在本发明的一种形式中，可切换接口具有确定被连接到的网络使用的协议的能力，并相应地切换接口。使用通用接口可降低站设备成本，并提供增加的用户便利性，因为只需要一个连接器来连接各种介质类型。

7. 发明授权

US5341405A Data recovery apparatus and methods 失效
标题翻译：数据恢复装置及方法
公开(公告)号：US5341405A
公开(公告)日：1994-08-23
申请号：US184892
申请日：1994-01-21
申请人： William C. Mallard, Jr.
发明人： William C. Mallard, Jr.
IPC分类号： H03D3/24 , H04L7/033 , H04L25/14
CPC分类号： H03D3/242 , H04L25/14 , H04L7/033
摘要： Data recovery apparatus for receiving two channels of data signal portions skewed in time and recovering from them two data signal portions synchronized with a con, non clock signal. The apparatus includes a phase comparator circuit and a latch circuit associated with each channel of data signals, a single voltage controlled oscillator that generates a clock signal VCO-CLK in response to a VCO control signal and a single charge pumping circuit for generating the VCO control signal. Each phase comparator circuit receives its associated channel of data signal portions and the VCO-CLK signal and generates pump-up/pump-down signals applied to the charge pumping circuit. Each latch circuit is triggered by a selected edge of the VCO-CLK signal, so that the latch circuits respectively provide recovered data signal portions synchronized with the VCO-CLK signal, which may then be recombined in the same sequence as they were originally divided from a common high data-rate signal.
摘要翻译：数据恢复装置，用于接收在时间上倾斜的两个数据信号部分的信道，并从中恢复两个数据信号部分，与同步的非时钟信号同步。该装置包括相位比较器电路和与数据信号的每个通道相关联的锁存电路，单个压控振荡器，响应于VCO控制信号产生时钟信号VCO-CLK，以及用于产生VCO控制的单个电荷泵浦电路信号。每个相位比较器电路接收其关联的数据信号部分通道和VCO-CLK信号，并产生施加到电荷泵浦电路的泵浦/降压信号。每个锁存电路由VCO-CLK信号的选定边沿触发，使得锁存电路分别提供与VCO-CLK信号同步的恢复的数据信号部分，然后可以按照与原来从一个通用的高数据速率信号。

8. 发明授权

US5235617A Transmission media driving system 失效
标题翻译：传动媒体驱动系统
公开(公告)号：US5235617A
公开(公告)日：1993-08-10
申请号：US713153
申请日：1991-06-11
申请人： William C. Mallard, Jr.
发明人： William C. Mallard, Jr.
IPC分类号： H04L25/08 , H04L25/14 , H04L25/34 , H04L25/49
CPC分类号： H04L25/08 , H04L25/14 , H04L25/4925
摘要： A transmission media driving system for receiving high data rate serial binary data signal, dividing the signal into two or more lower data rate signal paths, modified duobinary encoding the signals and transmitting the signals on respective two-conductor transmission lines. The system includes ample encoding circuits for generating control signals and a line driver circuit, associated with each encoding circuit, that is responsive to the control signals to drive one of the transmission lines with the modified duobinary encoded signal through a transformer. The driver circuit includes multiple current sources that are switched to conducting or nonconducting states in response to the control signals to drive currents through a primary winding of the transformer to achieve appropriate levels of the encoded signal.
摘要翻译：一种用于接收高数据速率串行二进制数据信号的传输介质驱动系统，将信号分成两个或多个较低数据速率信号路径，对信号进行修改的二进制编码，并在相应的双导体传输线上发送信号。该系统包括用于产生控制信号的大量编码电路和与每个编码电路相关联的线路驱动器电路，其响应于控制信号，通过变压器利用经修改的二进制编码信号驱动传输线之一。驱动器电路包括响应于控制信号切换到导通或不导通状态的多个电流源，以驱动通过变压器的初级绕组的电流，以实现编码信号的适当电平。

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