公开(公告)号：US07930684B2

公开(公告)日：2011-04-19

申请号：US11248881

申请日：2005-10-12

申请人： Guenter E. Roeck ,  Serge Pashenkov ,  Serge Shats

发明人： Guenter E. Roeck ,  Serge Pashenkov ,  Serge Shats

IPC分类号： G06F9/44 ,  G06F11/00

CPC分类号： G06F11/2046 ,  G06F11/1471 ,  G06F11/2028

摘要： A system, method, and computer-accessible medium for logging and replaying asynchronous events are disclosed. One or more asynchronous events occurring during execution of a first instance of a computer program are logged. In logging the asynchronous events, a respective location in the execution of the first instance at which each of the one or more asynchronous events occurs is determined. A respective synchronous event preceding each asynchronous event is also determined. The asynchronous events are replayed during execution of a second instance of the computer program. In replaying each asynchronous event, the second instance is instrumented at the respective location during the execution of the second instance after detecting the preceding synchronous event.

摘要翻译： 公开了用于记录和重放异步事件的系统，方法和计算机可访问介质。 记录在执行计算机程序的第一实例期间发生的一个或多个异步事件。 在记录异步事件时，确定执行一个或多个异步事件中的每一个发生的第一实例的相应位置。 每个异步事件之前的相应的同步事件也被确定。 在执行计算机程序的第二个实例期间重播异步事件。 在重播每个异步事件时，在检测到先前的同步事件之后，第二个实例在执行第二个实例期间被检测在相应的位置。

公开(公告)号：US07246368B1

公开(公告)日：2007-07-17

申请号：US09493405

申请日：2000-01-28

申请人： Mark E. Millet ,  Guenter E. Roeck ,  Chrisanto Leano ,  James A. Clark

发明人： Mark E. Millet ,  Guenter E. Roeck ,  Chrisanto Leano ,  James A. Clark

IPC分类号： H04N7/16

CPC分类号： H04L43/50

摘要： A system for testing a cable network during normal operation interleaves test signals with live data traffic. Installed cable modems are used to generate the test signals. During live communication, such modems send upstream data at allotted time periods. Periodically, there are time slots when no modem is transmitting on the network. During these times, specific modems may be directed to transmit specific test signals. A controller such as a cable modem termination system directs specific modems to transmit signals at defined frequencies and powers during specific time slots. In this manner, the system can monitor the frequency response of the cable network at various locations, and thereby determine “on-the-fly” when maintenance or modification is required.

摘要翻译： 用于在正常操作期间测试有线网络的系统用实时数据流量交织测试信号。 安装的电缆调制解调器用于产生测试信号。 在实时通信中，这种调制解调器在分配的时间段发送上行数据。 周期性地，当网络上没有调制解调器正在发送时，有时隙。 在这些时间期间，特定的调制解调器可以被引导以发送特定的测试信号。 诸如电缆调制解调器终端系统的控制器引导特定调制解调器在特定时隙期间以定义的频率和功率发送信号。 以这种方式，系统可以监视各个位置处的电缆网络的频率响应，从而在需要维护或修改时确定“即时”。

公开(公告)号：US07227889B1

公开(公告)日：2007-06-05

申请号：US10422613

申请日：2003-04-24

申请人： Guenter E. Roeck ,  Wei-Sing Chen ,  Sunil Khaunte ,  Mark E. Millet

发明人： Guenter E. Roeck ,  Wei-Sing Chen ,  Sunil Khaunte ,  Mark E. Millet

IPC分类号： H04B1/38

CPC分类号： H04L12/66 ,  H04L41/0213 ,  H04L41/0681 ,  H04L43/045 ,  H04L43/065 ,  H04L43/0817 ,  H04L43/10 ,  H04N7/17309 ,  H04N21/2402 ,  H04N21/42676 ,  H04N21/4424 ,  H04N21/6583

摘要： Methods, apparatus, and computer-readable media are disclosed for performing diagnostic tests of a communication link between a headend and a cable modem without having to assign an IP address to the cable modem. The diagnostic tests are performed at the MAC layer and test the state of the hardware between and including the cable modem termination system (CMTS) and a selected cable modem. By doing so, a network operator is able to more easily focus in on a potential problem in cable RF/MAC connectivity between the two components by first eliminating (or identifying) a problem with hardware before focusing on problem-solving at the software level, typically at the Network layer, at which point the cable modem is assigned an IP address.

摘要翻译： 公开了用于执行前端和电缆调制解调器之间的通信链路的诊断测试的方法，装置和计算机可读介质，而不必为电缆调制解调器分配IP地址。 诊断测试在MAC层执行，并测试电缆调制解调器终端系统（CMTS）和所选电缆调制解调器之间的硬件状态。 通过这样做，网络运营商能够更加轻松地集中在两个组件之间的有线RF / MAC连接的潜在问题上，首先在着重于软件层面的问题解决之前消除（或识别）硬件问题， 通常在网络层，电缆调制解调器在此时被分配一个IP地址。

公开(公告)号：US07068712B1

公开(公告)日：2006-06-27

申请号：US09484612

申请日：2000-01-18

申请人： Joanna Qun Zang ,  Feisal Daruwalla ,  James R. Forster ,  Guenter E. Roeck ,  Joseph O'Donnell ,  John Chen ,  Mark Millet

发明人： Joanna Qun Zang ,  Feisal Daruwalla ,  James R. Forster ,  Guenter E. Roeck ,  Joseph O'Donnell ,  John Chen ,  Mark Millet

IPC分类号： H04B1/38

CPC分类号： G06F11/2005 ,  H04L29/12009 ,  H04L61/00 ,  H04N7/173 ,  H04N21/64738

摘要： A CMTS redundancy technique requires at least two CMTS interfaces (e.g., line cards) on one or more CMTS chassis at the head end of a cable network. One of the CMTSs serves as a backup or “protecting” CMTS. When another CMTS (a “working” CMTS) becomes unavailable to service its group of cable modems, the protecting CMTS takes over service to those cable modems. The SWITCHOVER takes place transparently (or nearly transparently) to the cable modems. The protecting CMTS provides service on the same downstream channel as used by the working CMTS. The cable modems need not modify any settings pursuant to their cable modem communication protocol (e.g., DOCSIS ranging). This transparency to the cable modems is realized by keeping the working and protecting CMTSs in synchronization regarding service parameters for the cable modems. In other words, the protecting CMTS maintains a list of current parameters for allowing service to the cable modems.

摘要翻译： CMTS冗余技术在电缆网络的头端的一个或多个CMTS机架上需要至少两个CMTS接口（例如，线路卡）。 其中一个CMTS作为备份或“保护”CMTS。 当另一个CMTS（“工作”CMTS）变得不可用来为其组的电缆调制解调器服务时，保护CMTS将接管这些电缆调制解调器的服务。 SWITCHOVER透明地（或几乎透明地）发送到电缆调制解调器。 保护CMTS在工作CMTS使用的同一下行信道上提供服务。 电缆调制解调器不需要根据其电缆调制解调器通信协议（例如，DOCSIS测距）来修改任何设置。 电缆调制解调器的透明度通过保持工作和保护CMTS与电缆调制解调器的服务参数同步而实现。 换句话说，保护CMTS维护用于允许对电缆调制解调器的服务的当前参数的列表。

公开(公告)号：US06691250B1

公开(公告)日：2004-02-10

申请号：US09607108

申请日：2000-06-29

申请人： Anil K. Chandiramani ,  Guenter E. Roeck

发明人： Anil K. Chandiramani ,  Guenter E. Roeck

IPC分类号： G06F1100

CPC分类号： G06F11/079 ,  G06F11/0706 ,  G06F11/0793

摘要： Methods, apparatus, and computer program products are disclosed for analyzing and recovering from severe to catastrophic faults in a computer system. When a fault that cannot be handled by the computer system's normal fault handling processes, a shadow mode created by a fault handling virtual machine is invoked. The fault handling virtual machine executes only when the normally nonrecoverable fault is encountered and executes as a triangulated or shadow mode on the system. Once shadow mode is invoked, fault context data is collected on the system and used to analyze and recover from the fault. More specifically, one or more post-fault stable states are constructed by the fault handling virtual machine. These stable states are used to bring the computer system back to a normal operating state in which the component or action causing the initial nonrecoverable fault is avoided. Persistent faults may be encountered while the virtual machine is attempting to recover from the initial fault.

摘要翻译： 公开了用于在计算机系统中从严重到灾难性故障的分析和恢复的方法，装置和计算机程序产品。 当计算机系统的正常故障处理过程无法处理的故障时，调用由故障处理虚拟机创建的影子模式。 故障处理虚拟机仅在遇到正常不可恢复故障时执行，并在系统上作为三角测量或阴影模式执行。 一旦调用了阴影模式，系统收集故障上下文数据，并用于从故障中分析和恢复。 更具体地说，一个或多个故障后稳定状态由故障处理虚拟机构成。 这些稳定状态用于使计算机系统恢复到避免导致初始不可恢复故障的组件或动作的正常操作状态。 虚拟机试图从初始故障中恢复时可能会遇到持续的故障。

公开(公告)号：US06574796B1

公开(公告)日：2003-06-03

申请号：US09227990

申请日：1999-01-08

申请人： Guenter E. Roeck ,  Wei-Sing Chen ,  Charles J. Naegeli

发明人： Guenter E. Roeck ,  Wei-Sing Chen ,  Charles J. Naegeli

IPC分类号： H04N7173

CPC分类号： H04L27/0012 ,  H04N5/4401 ,  H04N5/46 ,  H04N5/50 ,  H04N7/17309 ,  H04N21/42676 ,  H04N21/4382 ,  H04N21/4384 ,  H04N21/6118

摘要： Apparatus, methods, and computer program products are disclosed for detecting or locating a viable data carrier in a downstream channel by a cable modem. When a cable modem is first installed by a cable operator or powered up by a user, it must first locate or tune in to the correct downstream channel in order to receive data from the headend of the cable plant. This time-consuming process can be shortened by performing two matches between the selected, potential downstream data carrier and constellation diagrams of certain modulation schemes. Through this method, potential channels for data carriers can be eliminated quickly by going through a “screening” process (the first constellation diagram match) thereby preventing those potential channels from going through a significantly more time-consuming second constellation match. The process begins with selecting a potential frequency channel from the downstream band. It is then determined whether the potential channel contains a signal modulated in a particular modulation scheme where the modulation scheme is one not normally used on signals in the downstream channel, such as QPSK. If the signal in the potential frequency channel is not modulated according to the particular modulation scheme, the cable modem determines whether the signal in the potential channel is modulated according to another particular modulation scheme, such as QAM64 or QAM256. These particular modulation schemes, however, are ones normally used on signals in the downstream channel. The determination of whether the signal in the potential channel is modulated according to the first particular modulation scheme is done rapidly and only potential channels containing a signal likely to be modulated according to the second particular modulation scheme are examined for the second determination step.

摘要翻译： 公开了用于通过电缆调制解调器检测或定位下行信道中的可行数据载体的装置，方法和计算机程序产品。 当电缆调制解调器首先由电缆操作员安装或由用户加电时，它必须首先定位或调入正确的下游通道，以从电缆设备的前端接收数据。 可以通过在所选择的潜在下游数据载体和某些调制方案的星座图之间执行两个匹配来缩短这个耗时的过程。 通过这种方法，可以通过“筛选”过程（第一个星座图匹配）来快速消除数据载体的潜在信道，从而防止这些潜在信道经历显着更耗时的第二星座匹配。 该过程开始于从下游频带选择潜在的频道。 然后确定潜在信道是否包含在特定调制方案中调制的信号，其中调制方案是在下行信道中的信号（例如QPSK）上通常不使用的信号。 如果根据特定的调制方案没有调制潜在频道中的信号，则电缆调制解调器根据另一特定的调制方案（例如QAM64或QAM256）来确定是否调制潜在信道中的信号。 然而，这些特定的调制方案是通常用于下行信道中的信号的方案。 根据第一特定调制方案调制潜在信道中的信号是否被确定，并且仅在第二确定步骤中检查仅包含根据第二特定调制方案可能被调制的信号的潜在信道的潜在信道。

公开(公告)号：US07966409B1

公开(公告)日：2011-06-21

申请号：US10899668

申请日：2004-07-26

申请人： Feisal Daruwalla ,  James R. Forster ,  Guenter E. Roeck ,  Richard M. Woundy ,  Michael A. Thomas

发明人： Feisal Daruwalla ,  James R. Forster ,  Guenter E. Roeck ,  Richard M. Woundy ,  Michael A. Thomas

IPC分类号： G06F15/16

CPC分类号： H04L45/28 ,  H04L12/2801 ,  H04L45/00 ,  H04L45/22 ,  H04L45/586 ,  H04M3/08 ,  H04N7/17309 ,  H04N21/2404 ,  H04N21/4788 ,  H04N21/6118 ,  H04N21/6168 ,  H04N21/6402 ,  H04N21/64322

摘要： A protection CMTS is available to immediately service a cable modem should that modem's service from a working CMTS fail for any reason. To speed the service transfer (cutover) from the working CMTS to the protection CMTS, the cable modem may preregister with the protection CMTS well before the cutover becomes necessary. The cable modem's registration with both the working CMTS and the protection CMTS preferably employs a single IP address, so that the cable modem need not obtain a new IP address during cutover. While the cable modem may register with both the working CMTS and the protection CMTS, the devices are designed or configured so that only the working CMTS injects a host route for the cable modem into the appropriate routing protocol. Only after cutover to the protection CMTS does the protection CMTS inject its host route.

摘要翻译： 如果调制解调器从工作CMTS的服务由于任何原因而失败，则保护CMTS可用于立即服务有线调制解调器。 为了加速从工作CMTS到保护CMTS的业务传输（切换），电缆调制解调器可以在割接变得必要之前预先注册保护CMTS。 电缆调制解调器与工作CMTS和保护CMTS的注册优选地采用单个IP地址，使得电缆调制解调器在切换期间不需要获得新的IP地址。 当电缆调制解调器可以向工作CMTS和保护CMTS两者注册时，设备被设计或配置为使得只有工作CMTS将电缆调制解调器的主机路由注入适当的路由协议。 只有在切换到保护CMTS之后，保护CMTS才会注入其主机路由。

公开(公告)号：US06839829B1

公开(公告)日：2005-01-04

申请号：US09484189

申请日：2000-01-18

申请人： Feisal Daruwalla ,  James R. Forster ,  Guenter E. Roeck ,  Richard M. Woundy ,  Michael A. Thomas

发明人： Feisal Daruwalla ,  James R. Forster ,  Guenter E. Roeck ,  Richard M. Woundy ,  Michael A. Thomas

IPC分类号： H04L12/28 ,  H04L12/56 ,  H04N7/173 ,  G06F15/177 ,  G06F11/273 ,  G06F15/173

CPC分类号： H04L45/28 ,  H04L12/2801 ,  H04L45/00 ,  H04L45/22 ,  H04L45/586 ,  H04M3/08 ,  H04N7/17309 ,  H04N21/2404 ,  H04N21/4788 ,  H04N21/6118 ,  H04N21/6168 ,  H04N21/6402 ,  H04N21/64322

摘要： A protection CMTS is available to immediately service a cable modem should that modem's service from a working CMTS fail for any reason. To speed the service transfer (cutover) from the working CMTS to the protection CMTS, the cable modem may preregister with the protection CMTS well before the cutover becomes necessary. The cable modem's registration with both the working CMTS and the protection CMTS preferably employs a single IP address, so that the cable modem need not obtain a new IP address during cutover. While the cable modem may register with both the working CMTS and the protection CMTS, the devices are designed or configured so that only the working CMTS injects a host route for the cable modem into the appropriate routing protocol. Only after cutover to the protection CMTS does the protection CMTS inject its host route.

摘要翻译： 如果调制解调器从工作CMTS的服务由于任何原因而失败，则保护CMTS可用于立即服务有线调制解调器。 为了加速从工作CMTS到保护CMTS的业务传输（切换），电缆调制解调器可以在割接变得必要之前预先注册保护CMTS。 电缆调制解调器与工作CMTS和保护CMTS的注册优选地采用单个IP地址，使得电缆调制解调器在切换期间不需要获得新的IP地址。 当电缆调制解调器可以向工作CMTS和保护CMTS两者注册时，设备被设计或配置为使得只有工作CMTS将电缆调制解调器的主机路由注入适当的路由协议。 只有在切换到保护CMTS之后，保护CMTS才会注入其主机路由。

公开(公告)号：US07058007B1

公开(公告)日：2006-06-06

申请号：US09484611

申请日：2000-01-18

申请人： Feisal Daruwalla ,  James R. Forster ,  Guenter E. Roeck ,  Joanna Qun Zang ,  Yong Lu

发明人： Feisal Daruwalla ,  James R. Forster ,  Guenter E. Roeck ,  Joanna Qun Zang ,  Yong Lu

IPC分类号： H04L12/26 ,  H04J1/16 ,  G06F11/00 ,  G08C15/00 ,  G01R31/08

CPC分类号： H04L45/00 ,  G06F11/2005 ,  H04L45/22 ,  H04L45/28

摘要： A protection CMTS is available to immediately service a cable modem should that modem's service from a working CMTS fail for any reason. To speed the service transfer (cutover) from the working CMTS to the protection CMTS, the cable modem may preregister with the protection CMTS well before the cutover becomes necessary. The cable modem's registration with both the working CMTS and the protection CMTS preferably employs a single IP address, so that the cable modem need not obtain a new IP address during cutover. While the cable modem may register with both the working CMTS and the protection CMTS, the devices are designed or configured so that only the working CMTS injects a host route for the cable modem into the appropriate routing protocol. Only after cutover to the protection CMTS does the protection CMTS inject its host route.

公开(公告)号：US6032019A

公开(公告)日：2000-02-29

申请号：US234775

申请日：1999-01-20

申请人： Wei-Sing Chen ,  Guenter E. Roeck

发明人： Wei-Sing Chen ,  Guenter E. Roeck

IPC分类号： H04B3/38 ,  H04H20/78 ,  H04L12/26 ,  H04L12/28 ,  H04N5/21 ,  H04N7/14 ,  H04N7/173 ,  H04N17/00 ,  H04H1/02

CPC分类号： H04N17/00 ,  H04B3/38 ,  H04H20/12 ,  H04L12/2697 ,  H04L12/2801 ,  H04L43/50 ,  H04N7/14 ,  H04N7/17309 ,  H04H20/78 ,  H04N5/21

摘要： A system and method for locating ingress noise gaps for an upstream data carrier in a cable network utilizing cable modems is described. A system for identifying a transmission frequency that has less noise than other available frequency bands includes a packet generator, a rate controller, an echo device, a demodulator, and a packet checker. The packet generator and rate controller, contained in a cable modem termination system, send test data downstream to the echo device which then redirects the test data upstream at a selected test frequency. The echo device, which may be located within the cable modem termination system or outside the termination system, listens on the downstream path for data packets addressed to it. Once received, the echo changes the address of the test data to the address of the packet checker. The packet checker then receives and analyzes the test data packet sent from the echo device to assess the amount of noise on that particular test frequency. The echo device can be a subscriber cable data modem configured to receive test packets sent downstream or a custom-built device located anywhere on the downstream path or within the cable modem termination system.

摘要翻译： 描述了利用电缆调制解调器在有线网络中为上行数据载体定位入口噪声间隙的系统和方法。 用于识别具有比其它可用频带更小的噪声的传输频率的系统包括分组生成器，速率控制器，回波设备，解调器和分组检查器。 包含在电缆调制解调器终端系统中的分组生成器和速率控制器将下行的测试数据发送到回波设备，然后在所选择的测试频率上将测试数据重定向到上游。 可以位于电缆调制解调器终端系统内或终端系统外部的回波设备在下行路径上侦听寻址到其的数据分组。 一旦接收到，回波将测试数据的地址更改为分组检查器的地址。 分组检查器然后接收并分析从回波设备发送的测试数据分组，以评估该特定测试频率上的噪声量。 回波设备可以是被配置为接收下游发送的测试分组的用户电缆数据调制解调器或位于下游路径上或电缆调制解调器终端系统内的任何地方的定制设备。