公开(公告)号：US5608728A

公开(公告)日：1997-03-04

申请号：US421612

申请日：1995-04-13

Applicant: John Ulm ,  William D. Corley ,  Cynthia Mazza-Brennan ,  Christopher Grobicki

Inventor： John Ulm ,  William D. Corley ,  Cynthia Mazza-Brennan ,  Christopher Grobicki

IPC: H04L12/28 ,  H04L25/03 ,  H04N7/173 ,  H04L12/403

CPC classification number: H04L25/03133 ,  H04L12/2801 ,  H04N7/17309

Abstract: A system and method for equalization for forward and reverse channels of communicating highway network system having a branching tree topology. The system and method cause the forward channel to be adjusted first for equalization, then the reverse channel is adjusted for equalization. A reference node periodically transmits a frequency-rich signal on the network to the head end, which broadcasts this signal to each of a number of system nodes. Each system node compares the frequency-rich signal with an expected signal, and adjusts its receiver based on this comparison. Next, each system node transmits another frequency-rich signal to the head end, receives a return echo, compares the echo with the transmitted signal, and adjusts its transmitter based on the comparison.

Abstract translation: 一种具有分支树拓扑的通信公路网系统的正向和反向信道均衡的系统和方法。 系统和方法使前置信道先进行均衡调整，然后调整反向信道进行均衡。 参考节点周期性地将网络上的富频率信号发送到头端，该终端将该信号广播到多个系统节点中的每一个。 每个系统节点将富频率信号与预期信号进行比较，并根据该比较调整其接收机。 接下来，每个系统节点向头端发送另一个富频率信号，接收返回回波，将回波与发送信号进行比较，并根据比较调整发射机。

公开(公告)号：US6098131A

公开(公告)日：2000-08-01

申请号：US72410

申请日：1998-05-04

Applicant: Dave Unger ,  David J. Berman ,  Christopher Grobicki ,  Lance J. McNally ,  Mark Shufelt ,  John Ulm

Inventor： Dave Unger ,  David J. Berman ,  Christopher Grobicki ,  Lance J. McNally ,  Mark Shufelt ,  John Ulm

IPC: H05K7/14 ,  G06F13/14

CPC classification number: H05K7/1435

Abstract: A network apparatus having a chassis with an external network data port and a removable electronic module coupled to the network data port through an internal data port when the removable electronic module is present in the chassis. The chassis may also provide power, radio frequency (RF), data bus, and other types of electrical and data connections to the electronic module through the use of additional internal ports. The apparatus may additionally be connected to others via a data bus, and be included as part of a rack-mounted system. The electronic module may be inserted and removed from the chassis while electrical power is applied to the chassis.

Abstract translation: 一种网络设备，具有具有外部网络数据端口的机箱和可拆卸电子模块，当可拆卸电子模块存在于机架中时，该电子模块通过内部数据端口耦合到网络数据端口。 机箱还可以通过使用额外的内部端口向电子模块提供电力，射频（RF），数据总线以及其他类型的电气和数据连接。 该装置还可以经由数据总线连接到其他装置，并且被包括为机架安装系统的一部分。 当电力被施加到底盘时，可以将电子模块从机架插入和移除。

公开(公告)号：US5471474A

公开(公告)日：1995-11-28

申请号：US72585

申请日：1993-06-04

Applicant: Christopher Grobicki ,  Cynthia Mazza ,  Edward O'Connell ,  John Ulm ,  Gerard White

Inventor： Christopher Grobicki ,  Cynthia Mazza ,  Edward O'Connell ,  John Ulm ,  Gerard White

IPC: H04L12/28 ,  H04N7/173 ,  H04J3/02

CPC classification number: H04N7/173 ,  H04L12/2801

Abstract: A communications highway network system for the interactive communication of digital and analog information that incorporates LAN, MAN, and CATV technology to provide an information pathway of metropolitan size that has a spanning tree topology. The system is multiple drop that operates according a network protocol. The network protocol is based on modified TDM techniques, compensation for round trip loop delay, dynamic allocation of time slots on the network bus, and global synchronization. The protocol also permits concatenation of data packets to reduce overhead. Access to the network bus is controlled by a system allocator operating according to the network protocol. The allocator may allocate network bus bandwidth to simultaneously provide three levels of service for the system nodes to access the network bus, namely, isochronous, demand-based dedicated, and contention bandwidth allocation. This allocation method incorporates fairness to give all nodes sufficient bus access opportunities.

Abstract translation: 一种用于数字和模拟信息的交互式通信的通信公路网系统，其结合了LAN，MAN和CATV技术，以提供具有生成树拓扑的大都市信息路径。 该系统是根据网络协议操作的多个丢弃。 网络协议基于修改的TDM技术，对往返环路延迟的补偿，网络总线上的时隙的动态分配以及全局同步。 该协议还允许数据包的级联以减少开销。 网络总线的访问由根据网络协议操作的系统分配器控制。 分配器可以分配网络总线带宽以同时为系统节点提供三级服务以访问网络总线，即同步，基于需求的专用和竞争带宽分配。 这种分配方法具有公平性，可以为所有节点提供足够的总线访问机会。