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    System for managing signals in different clock domains and a programmable digital filter
    1.
    发明授权
    System for managing signals in different clock domains and a programmable digital filter 失效
    用于管理不同时钟域中的信号的系统和可编程数字滤波器

    公开(公告)号：US06175603B1

    公开(公告)日：2001-01-16

    申请号：US08908278

    申请日：1997-08-07

    申请人： John T. Chapman ,  Daniel W. Crocker ,  Bruce Y. Chen

    发明人： John T. Chapman ,  Daniel W. Crocker ,  Bruce Y. Chen

    IPC分类号： H04L700

    CPC分类号： H04L7/0012 ,  H04L7/02

    摘要： A synchronizer circuit manages signals in different clock domains by generating clock pulses synchronized with a system clock. The clock pulses are generated at a rate proportional to the frequency of a clock operating in a first clock domain. Digital circuitry is then driven at the frequency of the first clock and in the time domain of the system clock. A hand-shaking protocol prevents the synchronizer circuit from going into a metastable condition when passing clock or data signals into different time domains. A programmable digital filter includes multiple sampling stages that sample an input signal. A detection circuit has inputs coupled to the outputs of the multiple sampling stages and changes the logic state of an output signal when no glitches are detected in the samples of the input signal. A control circuit selectively varies a time period used by the filter for sampling the input signal.

    摘要翻译： 同步器电路通过产生与系统时钟同步的时钟脉冲来管理不同时钟域中的信号。 时钟脉冲以与在第一时钟域中操作的时钟的频率成比例的速率产生。 然后以第一时钟的频率和系统时钟的时域驱动数字电路。 握手协议可防止同步电路在将时钟或数据信号传输到不同的时域时进入亚稳态。 可编程数字滤波器包括对输入信号进行采样的多个采样级。 检测电路具有耦合到多个采样级的输出的输入，并且当在输入信号的采样中没有检测到毛刺时改变输出信号的逻辑状态。 控制电路选择性地改变由滤波器使用的时间段以对输入信号进行采样。

    System for managing signals in different clock domains and a programmable digital filter
    2.
    发明授权
    System for managing signals in different clock domains and a programmable digital filter 有权
    用于管理不同时钟域中的信号的系统和可编程数字滤波器

    公开(公告)号：US06823029B1

    公开(公告)日：2004-11-23

    申请号：US09713156

    申请日：2000-11-14

    申请人： John T. Chapman ,  Daniel W. Crocker ,  Bruce Y. Chen

    发明人： John T. Chapman ,  Daniel W. Crocker ,  Bruce Y. Chen

    IPC分类号： H04L700

    CPC分类号： H04L7/0012 ,  H04L7/02

    摘要： A synchronizer circuit manages signals in different clock domains by generating clock pulses synchronized with a system clock. The clock pulses are generated at a rate proportional to the frequency of a clock operating in a first clock domain. Digital circuitry is then driven at the frequency of the first clock and in the time domain of the system clock. A hand-shaking protocol prevents the synchronizer circuit from going into a metastable condition when passing clock or data signals into different time domains. A programmable digital filter includes multiple sampling stages that sample an input signal. A detection circuit has inputs coupled to the outputs of the multiple sampling stages and changes the logic state of an output signal when no glitches are detected in the samples of the input signal. A control circuit selectively varies a time period used by the filter for sampling the input signal.

    摘要翻译： 同步器电路通过产生与系统时钟同步的时钟脉冲来管理不同时钟域中的信号。 时钟脉冲以与在第一时钟域中操作的时钟的频率成比例的速率产生。 然后以第一时钟的频率和系统时钟的时域驱动数字电路。 握手协议可防止同步电路在将时钟或数据信号传输到不同的时域时进入亚稳态。 可编程数字滤波器包括对输入信号进行采样的多个采样级。 检测电路具有耦合到多个采样级的输出的输入，并且当在输入信号的采样中没有检测到毛刺时改变输出信号的逻辑状态。 控制电路选择性地改变由滤波器使用的时间段以对输入信号进行采样。

    Map message expediency monitoring and automatic delay adjustments in M-CMTS
    3.
    发明授权
    Map message expediency monitoring and automatic delay adjustments in M-CMTS 有权
    M-CMTS中的地图消息功能监控和自动延时调整

    公开(公告)号：US08081659B2

    公开(公告)日：2011-12-20

    申请号：US12167168

    申请日：2008-07-02

    申请人： Pawel Sowinski ,  Michael J. Healy ,  John T. Chapman ,  Daniel W. Crocker

    发明人： Pawel Sowinski ,  Michael J. Healy ,  John T. Chapman ,  Daniel W. Crocker

    IPC分类号： H04J3/16

    CPC分类号： H04J3/1694 ,  H04L12/2801 ,  H04L12/2861

    摘要： An M-CMTS compatible UEQAM device implements circuitry to identify and analyze MAP message in the data stream sent from the M-CMTS Core with respect to timing information embedded in those messages. The improved UEQAM will then create a specific message as an extension to DEPI to communicate that information to the M-CMTS Core. The M-CMTS Core will employ that analysis to automatically adjust MAP message advance time to reduce delay and thus improve system performance. This invention will provide a closed-loop between the M-CMTS Core and the UEQAM where valuable transmission information will periodically be fed back from UEQAM-to-M-CMTS Core in real-time.

    摘要翻译： M-CMTS兼容的UEQAM设备实现电路，用于识别和分析从M-CMTS核心发送的数据流中MAP消息相对于嵌入在那些消息中的定时信息。 然后，改进的UEQAM将创建特定消息作为DEPI的扩展，以将该信息传送到M-CMTS核心。 M-CMTS核心将采用该分析来自动调整MAP消息提前时间，以减少延迟，从而提高系统性能。 本发明将提供M-CMTS核心和UEQAM之间的闭环，其中有价值的传输信息将周期性地从UEQAM到M-CMTS核心实时反馈。

    Downstream remote physical interface for modular cable modem termination system
    4.
    发明授权
    Downstream remote physical interface for modular cable modem termination system 有权
    用于模块化电缆调制解调器终端系统的下行远程物理接口

    公开(公告)号：US07688828B2

    公开(公告)日：2010-03-30

    申请号：US11134589

    申请日：2005-05-17

    申请人： John T. Chapman ,  Daniel W. Crocker ,  Alon S. Bernstein ,  Michael J. Healy ,  David B. Fox

    发明人： John T. Chapman ,  Daniel W. Crocker ,  Alon S. Bernstein ,  Michael J. Healy ,  David B. Fox

    IPC分类号： H04L12/28 ,  H04L12/56 ,  H04J3/16 ,  H04J3/22 ,  H04J1/00 ,  H04N7/173 ,  H04N7/16

    CPC分类号： H04L12/2801 ,  H04L67/00 ,  H04L69/16 ,  H04L69/161 ,  H04L69/164 ,  H04L2212/00

    摘要： A modular Cable Modem Termination System (CMTS) includes a packet shelf operating a Data Over Cable Service Interface Specifications (DOCSIS) Media Access Control (MAC) framer. One or more downstream Physical Interface (PHY) shelves receive DOCSIS data from the packet shelf over a packet switched network and modulate the DOCSIS data for sending on a downstream path of a cable plant. One or more upstream PHY shelves send DOCSIS data received from an upstream path of the cable plant over the packet switched network to the packet shelf. By separating the PHY components from the MAC and from the system software, the PHY components for a Hybrid Fiber Coax (HFC) plant may be replaced with different PHY components for other access technologies such as wireless, Digital Subscriber Lines (DSL), Ethernet-to-the-Home, Fiber-to-the-Home, or fiber Passive Optical Networks (PONs).

    摘要翻译： 模块化电缆调制解调器终端系统（CMTS）包括操作数据有线业务接口规范（DOCSIS）媒体接入控制（MAC）成帧器的分组机架。 一个或多个下行物理接口（PHY）机架通过分组交换网络从分组机架接收DOCSIS数据，并且调制DOCSIS数据以在电缆设备的下游路径上发送。 一个或多个上游PHY层架将从电缆设备的上行路径接收的DOCSIS数据通过分组交换网络发送到分组架。 通过将PHY组件与MAC和系统软件分离，用于混合光纤同轴电缆（HFC）设备的PHY组件可以用于其他接入技术的不同PHY组件，例如无线，数字用户线（DSL），以太网 - 光纤到户或光纤无源光网络（PON）。

    Downstream channel change technique implemented in an access network
    6.
    发明授权
    Downstream channel change technique implemented in an access network 有权
    在接入网中实现的下行信道改变技术

    公开(公告)号：US07672230B2

    公开(公告)日：2010-03-02

    申请号：US11484249

    申请日：2006-07-10

    申请人： John T. Chapman ,  Daniel W. Crocker ,  Feisal Y. Daruwalla ,  Joanna Qun Zang ,  Yong Lu

    发明人： John T. Chapman ,  Daniel W. Crocker ,  Feisal Y. Daruwalla ,  Joanna Qun Zang ,  Yong Lu

    IPC分类号： G01R31/08 ,  G06F11/00 ,  H04L1/00 ,  H04L12/28

    CPC分类号： H04L12/2801 ,  H04N21/242

    摘要： A dynamic channel change technique is disclosed which may be implemented between nodes and a Head End of an access network. Initially a network device may communicate with the Head End via a first downstream channel and a first upstream channel. When the network device receives a dynamic channel change request which includes instructions for the network device to switch to a second downstream channel, the network device may respond by switching from the first downstream channel to the second downstream channel. Thereafter, the network device may communicate with the Head End via the second downstream channel and first upstream channel. Further, according to a specific embodiment, the dynamic channel change request may also include an upstream channel change request for causing the network device to switch from a first upstream channel to a second upstream channel.

    摘要翻译： 公开了可以在接入网络的节点和头端之间实现的动态信道改变技术。 最初，网络设备可以经由第一下游信道和第一上行信道与头端进行通信。 当网络设备接收到包括用于网络设备切换到第二下行信道的指令的动态信道改变请求时，网络设备可以通过从第一下游信道切换到第二下游信道来进行响应。 此后，网络设备可以经由第二下游信道和第一上行信道与头端进行通信。 此外，根据具体实施例，动态信道改变请求还可以包括用于使网络设备从第一上行信道切换到第二上行信道的上行信道改变请求。

    Technique for synchronizing network devices in an access data network
    7.
    发明授权
    Technique for synchronizing network devices in an access data network 有权
    在接入数据网络中同步网络设备的技术

    公开(公告)号：US07620836B1

    公开(公告)日：2009-11-17

    申请号：US11417759

    申请日：2006-05-03

    申请人： John T. Chapman ,  Daniel W. Crocker

    发明人： John T. Chapman ,  Daniel W. Crocker

    IPC分类号： G06F1/04

    CPC分类号： H04N21/242 ,  H04J3/0664 ,  H04L12/2801 ,  H04N7/17309 ,  H04N21/6168

    摘要： A master clock reference signal may be provided to selected packet fiber nodes in order to synchronize the local clock reference signals generated at selected devices in a cable network. In this way, selected portions of the cable network may be synchronized to a common timing reference signal. Additionally, synchronized timestamp information may also be provided to selected network devices in order to achieve synchronization of timestamps across a selected portion of the cable network.

    摘要翻译： 可以将主时钟参考信号提供给所选分组光纤节点，以便同步在有线网络中在选定设备处产生的本地时钟参考信号。 以这种方式，电缆网络的选定部分可以与公共定时参考信号同步。 另外，也可以将同步的时间戳信息提供给所选择的网络设备，以便实现跨越有线网络的所选部分的时间戳的同步。

    Upstream physical interface for modular cable modem termination system
    9.
    发明授权
    Upstream physical interface for modular cable modem termination system 有权
    模块化电缆调制解调器终端系统的上行物理接口

    公开(公告)号：US07639617B2

    公开(公告)日：2009-12-29

    申请号：US11131766

    申请日：2005-05-17

    申请人： John T. Chapman ,  Daniel W. Crocker ,  Eric Youngman ,  Alon S. Bernstein

    发明人： John T. Chapman ,  Daniel W. Crocker ,  Eric Youngman ,  Alon S. Bernstein

    IPC分类号： H04J1/16 ,  H04L12/26

    CPC分类号： H04L12/4633 ,  H04L12/2801

    摘要： A modular Cable Modem Termination System (CMTS) includes a packet shelf operating a Data Over Cable Service Interface Specifications (DOCSIS) Media Access Control (MAC) framer. One or more downstream Physical Interface (PHY) shelves receive DOCSIS data from the packet shelf over a packet switched network and modulate the DOCSIS data for sending on a downstream path of a cable plant. One or more upstream PHY shelves send DOCSIS data received from an upstream path of the cable plant over the packet switched network to the packet shelf. By separating the PHY components from the MAC and from the system software, the PHY components for a Hybrid Fiber Coax (HFC) plant may be replaced with different PHY components for other access technologies such as wireless, Digital Subscriber Lines (DSL), Ethernet-to-the-Home, Fiber-to-the-Home, or fiber Passive Optical Networks (PONs).

    摘要翻译： 模块化电缆调制解调器终端系统（CMTS）包括操作数据有线服务接口规范（DOCSIS）媒体访问控制（MAC）成帧器的分组机架。 一个或多个下行物理接口（PHY）机架通过分组交换网络从分组机架接收DOCSIS数据，并且调制DOCSIS数据以在电缆设备的下游路径上发送。 一个或多个上游PHY层架将从电缆设备的上行路径接收的DOCSIS数据通过分组交换网络发送到分组架。 通过将PHY组件与MAC和系统软件分离，用于混合光纤同轴电缆（HFC）设备的PHY组件可以被用于其他接入技术的不同PHY组件来替代，诸如无线，数字用户线（DSL），以太网 - 光纤到户或光纤无源光网络（PON）。