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1. 发明授权

US07227889B1 Media access layer ping protocol for diagnosing cable modem links 有权
标题翻译：介质访问层ping协议，用于诊断电缆调制解调器链路
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。

2. 发明授权

US06574796B1 Fast and reliable data carrier detection by a cable modem in a cable television plant 有权
标题翻译：通过有线电视机中的电缆调制解调器快速可靠的数据载体检测
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。

3. 发明授权

US06570913B1 Method and apparatus for selecting optimum frequency for upstream data transmission in a network system utilizing cable modems 有权
标题翻译：在利用有线调制解调器的网络系统中选择上行数据传输的最佳频率的方法和装置
公开(公告)号：US06570913B1
公开(公告)日：2003-05-27
申请号：US09286202
申请日：1999-04-05
申请人： Wei-Sing Chen
发明人： Wei-Sing Chen
IPC分类号： H04B138
CPC分类号： H04H60/97 , H04L12/2801 , H04N7/17309
摘要： Provided are methods and apparatuses for quickly and efficiently locating a frequency band for upstream transmission of data in a data communications network system utilizing cable modems. In a preferred embodiment, a cable modem termination system (CMTS) at the headend performs a lookahead in order to determine the noise power spectrum allocated to its upstream channels. Free bands (noise-free bands available for upstream data transmission) may then be determined based on the noise power spectrum and the upstream channel capacity requirements according to a process that is preferably implemented in computer code at the headend. The lookahead is preferably accomplished by using a spectrum analyzer, which is preferably incorporated into the CMTS at the headend, to collect a table of samples of the noise power versus frequency. This table of samples is input to a computational algorithm which determines free band sets for one or more preferred modulation formats rapidly and efficiently in software without the stepping of the upstream receiver frequency as in the blind frequency hop process. Once a band has been located, the CMTS assigns its frequency to an upstream channel and signals the cable modem of the frequency update.
摘要翻译：提供了用于利用电缆调制解调器在数据通信网络系统中快速有效地定位用于数据上行传输的频带的方法和装置。在优选实施例中，前端的电缆调制解调器终端系统（CMTS）执行前置以确定分配给其上行信道的噪声功率谱。然后可以根据优选地在前端的计算机代码中实现的处理，基于噪声功率谱和上行信道容量要求来确定自由频带（用于上行数据传输的无噪声频带）。前瞻性优选通过使用频谱分析仪来实现，频谱分析仪优选地并入到前端的CMTS中，以收集噪声功率对频率的样本表。这个样本表被输入到计算算法，该计算算法在软件中快速有效地确定一个或多个优选调制格式的自由波段，而不需要如盲盲跳频过程中的上游接收机频率的步进。一旦已经找到频带，CMTS将其频率分配给上行信道，并向电缆调制解调器通知频率更新。

4. 发明授权

US07469414B1 Fast and reliable data carrier detection by a cable modem in a cable television plant 有权
标题翻译：通过有线电视机中的电缆调制解调器快速可靠的数据载体检测
公开(公告)号：US07469414B1
公开(公告)日：2008-12-23
申请号：US10406866
申请日：2003-04-04
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： H04N7/173 , H04N17/00
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 for detecting or locating a viable data carrier in a downstream channel by a cable modem. Potential channels for data carriers can be eliminated quickly by going through a “screening” process, i.e., the first constellation diagram match, thereby preventing those potential channels from going through a significantly more time-consuming second constellation match. 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：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。可以通过进行“筛选”过程即第一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。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。

5. 发明授权

US06594305B1 Media access layer ping protocol for diagnosing cable modem links 有权
标题翻译：介质访问层ping协议，用于诊断电缆调制解调器链路
公开(公告)号：US06594305B1
公开(公告)日：2003-07-15
申请号：US09339067
申请日：1999-06-23
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： H04B138
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. A network command is received from a network operator causing the CMTS to place a service identifier corresponding to a cable modem in possible need of diagnosing into a poll list. The service identifier is placed in the poll list the number of times specified in the network command as the number of polls desired for the test. This causes the cable modem to receive a map message with a station maintenance time slot for itself from the CMTS the specified number of times. Periodic ranging is performed between the CMTS and the cable modem associated with the service identifier. If it is determined that the service identifier is in the poll list as a result of the network command, results are then evaluated from the periodic ranging and reported to the network operator as a DOCSIS ping success/failure. It is then determined whether the cable modem should remain on the poll list based on results from the periodic ranging.
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。从网络运营商接收到网络命令，导致CMTS将可能需要诊断的电缆调制解调器的服务标识符放置在轮询列表中。将服务标识符作为测试所需的轮询数量放在轮询列表中指定的网络命令中的次数。这使得电缆调制解调器从指定次数的CMTS接收到具有自身的站维护时隙的地图消息。在CMTS和与服务标识符相关联的电缆调制解调器之间执行周期性测距。如果由于网络命令确定服务标识符在轮询列表中，则结果将从周期范围进行评估，并作为DOCSIS ping成功/失败报告给网络运营商。然后根据周期性测距的结果确定电缆调制解调器是否应保留在轮询列表上。

6. 发明授权

US06973668B1 Method and apparatus for locating a faulty component in a cable television system having cable modems 有权
标题翻译：用于定位具有电缆调制解调器的有线电视系统中的故障部件的方法和装置
公开(公告)号：US06973668B1
公开(公告)日：2005-12-06
申请号：US10899936
申请日：2004-07-26
申请人： Wei-Sing Chen , Charles J. Naegeli , Mark E. Millet
发明人： Wei-Sing Chen , Charles J. Naegeli , Mark E. Millet
IPC分类号： H04N7/173
CPC分类号： H04L41/0659 , H04L41/0677 , H04N7/17309 , H04N17/004 , H04N21/2408 , H04N21/6118 , H04N21/6168
摘要： A method and system for locating faulty components in a cable modem network configured within a hybrid fiber-coaxial cable television system by tabulating modem performance data are described. A method of isolating problematic components in a cable modem network includes determining whether a cable modem transmitted a polling message to a central destination during the modem's allotted time interval. A media access control layer, located within a cable modem termination system (CMTS), keeps a miss count for the cable modem that reflects the number of times the cable modem does not transmit a polling message to the CMTS during its allotted time. The media access control layer determines whether the cable modem is changing states. This data and the miss count are tabulated in a form that can be analyzed by a correlation module to determine characteristics of the cable television plant.
摘要翻译：描述了通过列表调制解调器性能数据来配置在混合光纤同轴电缆电视系统内的电缆调制解调器网络中的故障组件的方法和系统。隔离有线调制解调器网络中的有问题的组件的方法包括在调制解调器分配的时间间隔期间确定电缆调制解调器是否向轮询消息传送轮询消息到中心目的地。位于电缆调制解调器终端系统（CMTS）内的媒体访问控制层保持电缆调制解调器的错过次数，该电缆调制解调器反映电缆调制解调器在其分配的时间期间不向CMTS发送轮询消息的次数。媒体访问控制层确定电缆调制解调器是否正在改变状态。该数据和未命中计数以表格形式列出，可由相关模块分析以确定有线电视设备的特征。

7. 发明授权

US06588016B1 Method and apparatus for locating a faulty component in a cable television system having cable modems 失效
标题翻译：用于定位具有电缆调制解调器的有线电视系统中的故障部件的方法和装置
公开(公告)号：US06588016B1
公开(公告)日：2003-07-01
申请号：US09107837
申请日：1998-06-30
申请人： Wei-Sing Chen , Charles J. Naegeli , Mark E. Millet
发明人： Wei-Sing Chen , Charles J. Naegeli , Mark E. Millet
IPC分类号： H04N7173
CPC分类号： H04N21/6583 , H04L41/0213 , H04L41/0677 , H04L43/045 , H04L43/065 , H04L43/0817 , H04L43/10 , H04N7/17309 , H04N21/2402 , H04N21/42676 , H04N21/4424
摘要： A method and system for locating faulty components in a cable modem network configured within a hybrid fiber-coaxial cable television system by tabulating modem performance data are described. A method of isolating problematic components in a cable modem network includes determining whether a cable modem transmitted a polling message to a central destination during the modem's allotted time interval. A media access control layer, located within a cable modem termination system (CMTS), keeps a miss count for the cable modem that reflects the number of times the cable modem does not transmit a polling message to the CMTS during its allotted time. The media access control layer determines whether the cable modem is changing states. This data and the miss count is tabulated in a form that can be analyzed by a correlation module to determine characteristics of the cable television plant. A cable modem entry is inserted into a list of modems experiencing irregular behavior according to the tabulated network topology data relating to the miss count.
摘要翻译：描述了通过列表调制解调器性能数据来配置在混合光纤同轴电缆电视系统内的电缆调制解调器网络中的故障组件的方法和系统。隔离有线调制解调器网络中的有问题的组件的方法包括在调制解调器分配的时间间隔期间确定电缆调制解调器是否向轮询消息传送轮询消息到中心目的地。位于电缆调制解调器终端系统（CMTS）内的媒体访问控制层保持电缆调制解调器的错过次数，该电缆调制解调器反映电缆调制解调器在其分配的时间期间不向CMTS发送轮询消息的次数。媒体访问控制层确定电缆调制解调器是否正在改变状态。该数据和丢失计数以可由相关模块分析以确定有线电视设备的特征的形式列表。电缆调制解调器条目根据与错过次数有关的列表网络拓扑数据插入到经历不规则行为的调制解调器列表中。

8. 发明授权

US06385773B1 Method and apparatus for upstream frequency channel transition 有权
标题翻译：用于上行频道转换的方法和装置
公开(公告)号：US06385773B1
公开(公告)日：2002-05-07
申请号：US09227060
申请日：1999-01-07
申请人： Alejandro H. Schwartzman , Mark E. Millet , Charles J. Naegeli , Wei-Sing Chen , Hung-San Chen
发明人： Alejandro H. Schwartzman , Mark E. Millet , Charles J. Naegeli , Wei-Sing Chen , Hung-San Chen
IPC分类号： H04N7173
CPC分类号： H04N7/17309 , H04L12/2801
摘要： Transitions among different upstream frequency channels in a cable television plant in order to transmit data occur while considering the noise level of the upstream frequency channel presently being used to transmit data. By taking into account the noise level of the presently used upstream frequency channel, the CMTS in a cable plant can make a more intelligent decision as to whether it is worthwhile changing the upstream frequency channel for a group of cable modems. A spectrum analyzer determines the noise level of a presently used frequency channel. A bit error rate for the present frequency channel is detected. The spectrum analyzer then determines whether the bit error rate exceeds a threshold value. Is so, it is then determined whether the noise level of the present frequency channel is greater than or less than the noise level of another frequency channel having the lowest noise level plus a buffer noise value. If the present noise level is greater, a transition is made to the other frequency channel with the lower noise level. If not, the cable plant continues using the present frequency channel. The noise level of the presently used frequency channel is measured at the CMTS upon receipt of an empty data packet arriving at a known timing mark.
摘要翻译：在考虑目前用于发送数据的上行频道的噪声电平的同时，在有线电视设备中的不同上行频道之间的转换以发送数据。通过考虑目前使用的上行频道的噪声水平，电缆设备中的CMTS可以更准确地决定是否值得改变一组电缆调制解调器的上行频道。频谱分析仪确定当前使用的频道的噪声电平。检测当前频道的误码率。然后，频谱分析仪确定误码率是否超过阈值。这样，然后确定当前频道的噪声电平是否大于或小于具有最低噪声电平加上缓冲器噪声值的另一频道的噪声电平。如果当前噪声电平较大，则对具有较低噪声电平的另一频道进行转换。如果没有，电缆厂继续使用当前的频道。当接收到到达已知定时标记的空数据分组时，在CMTS测量当前使用的频道的噪声电平。

9. 发明授权

US06782884B1 Method and apparatus for locating a faulty component in a cable television system having cable modems 有权
标题翻译：用于定位具有电缆调制解调器的有线电视系统中的故障部件的方法和装置
公开(公告)号：US06782884B1
公开(公告)日：2004-08-31
申请号：US10431219
申请日：2003-05-06
申请人： Wei-Sing Chen , Charles J. Naegeli , Mark E. Millet
发明人： Wei-Sing Chen , Charles J. Naegeli , Mark E. Millet
IPC分类号： H04N7173
CPC分类号： H04N21/6583 , H04L41/0213 , H04L41/0677 , H04L43/045 , H04L43/065 , H04L43/0817 , H04L43/10 , H04N7/17309 , H04N21/2402 , H04N21/42676 , H04N21/4424
摘要： A method and system for locating faulty components in a cable modem network configured within a hybrid fiber-coaxial cable television system by tabulating modem performance data are described. A method of isolating problematic components in a cable modem network includes determining whether a cable modem transmitted a polling message to a central destination during the modem's allotted time interval. A media access control layer, located within a cable modem termination system (CMTS), keeps a miss count for the cable modem that reflects the number of times the cable modem does not transmit a polling message to the CMTS during its allotted time. The media access control layer determines whether the cable modem is changing states. This data and the miss count are tabulated in a form that can be analyzed by a correlation module to determine characteristics of the cable television plant. A cable modem entry is inserted into a list of modems experiencing irregular behavior according to the tabulated network topology data relating to the miss count.
摘要翻译：描述了通过列表调制解调器性能数据来配置在混合光纤同轴电缆电视系统内的电缆调制解调器网络中的故障组件的方法和系统。隔离有线调制解调器网络中的有问题的组件的方法包括在调制解调器分配的时间间隔期间确定电缆调制解调器是否向轮询消息传送轮询消息到中心目的地。位于电缆调制解调器终端系统（CMTS）内的媒体访问控制层保持电缆调制解调器的错过次数，该电缆调制解调器反映电缆调制解调器在其分配的时间期间不向CMTS发送轮询消息的次数。媒体访问控制层确定电缆调制解调器是否正在改变状态。该数据和未命中计数以表格形式列出，可由相关模块分析以确定有线电视设备的特征。电缆调制解调器条目根据与错过次数有关的列表网络拓扑数据插入到经历不规则行为的调制解调器列表中。

10. 发明授权

US6032019A Echo device method for locating upstream ingress noise gaps at cable television head ends 有权
标题翻译：用于定位有线电视头端的上游入口噪声间隙的回波设备方法
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。

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