公开(公告)号：US5432789A

公开(公告)日：1995-07-11

申请号：US237023

申请日：1994-05-03

申请人： Michael J. Armstrong ,  Paul Woodruff

发明人： Michael J. Armstrong ,  Paul Woodruff

IPC分类号： H04L12/24 ,  H04L29/12 ,  H04J3/24

CPC分类号： H04L41/046 ,  H04L29/12009 ,  H04L41/12 ,  H04L41/26 ,  H04L61/00

摘要： A concentrator having a single medium access controller for monitoring a plurality of communication lines is provided. Each of the communication lines corresponds to a network and carries identification signals periodically transmitted by devices on the corresponding network. The medium access controller includes a transmit unit and a receive unit. The transmit unit sequentially broadcasts concentrator identification signals over each of the communication lines. The transmit unit sequences through the communication lines at a rate to insure that a concentrator identification signal is sent over each communication line during a predetermined transmit interval. The receive unit sequentially monitors the signals on each of the communication lines. The receive unit monitors the signals on any given communication line for a predetermined monitoring period before sequencing to the next communication line. The duration of the monitoring period for a given communication line is at least as long as the longest identification signal transmit interval for any device on the communication line. Consequently, the receive unit will detect an identification signal from all of the active devices on a given communication line during the monitoring period for the communication line. The receive unit stores an indication of the identification signals it detects and the ports on which they were detected. This stored information may be used by a network management station to generate a map showing how the concentrator is connected to other devices.

摘要翻译： 提供一种具有用于监测多个通信线路的单个介质访问控制器的集中器。 每个通信线路对应于网络，并携带由相应网络上的设备周期性发送的识别信号。 介质访问控制器包括发送单元和接收单元。 发送单元在每个通信线路上顺序地广播集中器识别信号。 发送单元通过通信线路以一定速率排序，以确保在预定发送间隔期间通过每个通信线路发送集中器识别信号。 接收单元顺序地监视每个通信线路上的信号。 在对下一个通信线路进行排序之前，接收单元监视任何给定通信线路上的信号达预定的监视周期。 给定通信线路的监视周期的持续时间至少与通信线路上任何设备的最长识别信号发送间隔一样长。 因此，在通信线路的监视期间，接收单元将检测来自给定通信线路上的所有活动设备的识别信号。 接收单元存储其检测到的识别信号和检测到的识别信号的指示。 该存储的信息可以由网络管理站使用以生成示出集中器如何连接到其他设备的映射。

公开(公告)号：US5684796A

公开(公告)日：1997-11-04

申请号：US344072

申请日：1994-11-23

申请人： Vasmi Abidi ,  Paul Woodruff

发明人： Vasmi Abidi ,  Paul Woodruff

IPC分类号： H04L12/24 ,  H04L29/12 ,  H04J3/24

CPC分类号： H04L61/00 ,  H04L29/12009 ,  H04L41/046 ,  H04L41/12 ,  H04L41/26

摘要： A multi-segment agent topology mechanism for use by multi-segment network devices in an Ethernet network. Topology information packets exchanged between topology agents in a network include segment identifier information as well as IP address of the sending agent. A device's topology agent maintains and updates topology information in topology tables which identifies interconnected network devices, such as concentrators and bridges, by IP address and segment identifier information as well as incoming slot and port information for eventual use by a network management system in evaluating a networks topology map, and in automatically determining changes in the network's topology.

摘要翻译： 一种多段代理拓扑机制，用于以太网网络中的多段网络设备。 在网络中的拓扑代理之间交换的拓扑信息分组包括分段标识信息以及发送代理的IP地址。 设备的拓扑代理维护和更新拓扑表中的拓扑信息，该拓扑表通过IP地址和段标识符信息以及传入的时隙和端口信息来识别互连的网络设备（如集中器和网桥），以便最终由网络管理系统用于评估 网络拓扑图，并自动确定网络拓扑中的变化。

公开(公告)号：US20070025814A1

公开(公告)日：2007-02-01

申请号：US11542979

申请日：2006-10-04

申请人： Paul Woodruff

发明人： Paul Woodruff

IPC分类号： E01F11/00

CPC分类号： E01C11/24

摘要： The invention includes a paved surface configured for reducing tire noise and increasing tire traction on the paved surface and to a method and apparatus for manufacturing such a paved surface. The paved surface includes grooves in the traffic bearing surface that are substantially neither transverse nor parallel to the intended direction of traffic.

摘要翻译： 本发明包括被配置为减少轮胎噪音并增加铺设表面上的轮胎牵引力的铺设表面以及用于制造这种铺砌表面的方法和装置。 铺设的表面包括在交通承载表面中基本上既不横向也不平行于预期交通方向的凹槽。

公开(公告)号：US5825755A

公开(公告)日：1998-10-20

申请号：US376125

申请日：1995-01-19

申请人： Geoffrey O. Thompson ,  Paul Woodruff

发明人： Geoffrey O. Thompson ,  Paul Woodruff

IPC分类号： H04L12/413

CPC分类号： H04L12/40136 ,  H04L12/413

摘要： A method and apparatus for a node to automatically switch between half-duplex and full-duplex transmission in CSMA/CD networks characterized by a first and second device coupled over a communication link to allow communication of information and control signals between the first and second device. Each of the two devices include a transmit circuit and a receive circuit, wherein the first device begins to transmit information on a first communication circuit, the first communication circuit providing for communication of information between the first device and the second device, and the second device receives the transmitted information. If, while the first device is transmitting information to the second device, the second device begins to transmit information on a second communication circuit, the second communication circuit providing for communication of information between the second device and the first device, and the first device receives the transmitted information, full-duplex communication therebetween is established. If, while the first device is transmitting information to the second device, the second device transmits a collision detect signal and the first device receives the collision detect signal, half-duplex communication therebetween is subsequently established.

摘要翻译： 一种用于节点自动切换CSMA / CD网络中的半双工和全双工传输的方法和装置，其特征在于通过通信链路耦合的第一和第二设备，以允许第一和第二设备之间的信息和控制信号的通信 。 两个设备中的每一个包括发射电路和接收电路，其中第一设备开始在第一通信电路上发送信息，第一通信电路提供第一设备和第二设备之间的信息通信，第二设备 接收发送的信息。 如果当第一设备正在向第二设备发送信息时，第二设备开始在第二通信电路上发送信息，第二通信电路提供第二设备与第一设备之间的信息通信，并且第一设备接收 所发送的信息，其间的全双工通信被建立。 如果当第一设备向第二设备发送信息时，第二设备发送冲突检测信号，并且第一设备接收到冲突检测信号，则随后建立其间的半双工通信。