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公开(公告)号：US12034619B2
公开(公告)日：2024-07-09
申请号：US17811676
申请日：2022-07-11
申请人： VIAVI SOLUTIONS INC.
IPC分类号： H04L43/08 , H04L12/28 , H04L43/045 , H04L43/0823
CPC分类号： H04L43/0823 , H04L12/2801 , H04L43/045
摘要： A CMTS may instruct one or more cable modems to transmit an upstream test signal with a particular preamble (and or any other type of signature) in the upstream transmission bandwidth. The preamble may be within a significant band of the upstream transmission bandwidth. A leakage detection device may be brought in the vicinity of the cable network to listen for various signals. The leakage detection device may filter received signals to retain the portions thereof within a desired limited band and further filter the band-limited signals to reduce noise, e.g., removing the payload following the preamble. A correlation filter in the leakage detection device may compare the pattern in the band-limited filtered signal with a stored preamble. If there is a match, the leakage detection device may generate an indication that leakage is detected in the upstream transmission.
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公开(公告)号：US11595710B2
公开(公告)日：2023-02-28
申请号：US16900549
申请日：2020-06-12
申请人： VIAVI SOLUTIONS INC.
IPC分类号： H04N21/24 , H04N21/61 , H04N21/442 , H04L12/28
摘要： A network test instrument is operable to conduct sweep tests with a cable modem termination system having a distributed architecture. Through signaling performed via a telemetry channel between the network test instrument and a sweep server, the network test instrument can initiate the sweep test. The sweep server communicates with the cable modem termination system to facilitate the sweep test between the network test instrument and the cable modem termination system.
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公开(公告)号：US10694177B2
公开(公告)日：2020-06-23
申请号：US15802232
申请日：2017-11-02
申请人： VIAVI SOLUTIONS INC.
发明人： Kyle Harris , Daniel K. Chappell
摘要： A TDR technique for performing in-service distance-to-fault measurements in cable TV networks is disclosed. Using a cable network tester configured to generate chirped probe pulses and to perform pulse-matched filtering and averaging of received echoes, network faults may be detected without interfering with the downstream reception. The probe pulse transmission may be timed to take advantage of the error correction coding in the network.
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公开(公告)号：US11085973B2
公开(公告)日：2021-08-10
申请号：US16370877
申请日：2019-03-29
发明人： Adam D. Gray , Daniel K. Chappell , Loren Eggert
IPC分类号： G01R31/52 , H04B17/354 , H01B7/32
摘要： Systems and methods for detecting leakage in a cable network system are disclosed. In at least some illustrative embodiments, a system may include a digital tagger operable to generate a digital tag including a chirp signal configured to be placed on a downstream signal path of the cable network system, and a cable network test instrument configured detect the digital tag in wireless signal data received from the cable network system when a point of ingress is presented in the cable network system. The network test instrument may be operable to provide a user-perceptible indication when the digital tag is detected to inform a technician or other user that a flaw in the cable network system is nearby.
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公开(公告)号：US09350986B2
公开(公告)日：2016-05-24
申请号：US14327589
申请日：2014-07-10
申请人： Viavi Solutions Inc.
IPC分类号： H04N7/173 , H04N17/00 , H04N21/633
CPC分类号： H04N17/004 , H04N7/17309 , H04N21/633
摘要： A dual-port testing apparatus is provided for testing a cable network at two test points. The testing may comprise demodulation of a same data packet at the test points, decoding the data packet, performing spectral analysis of the signal, etc. Testing results may be correlated with one another, both visually and by using pre-defined test metrics comprising a weighted sum of demodulation and decoding parameters such as modulation extinction ratio and a codeword error.
摘要翻译： 提供了一个双端口测试设备，用于在两个测试点测试有线网络。 测试可以包括对测试点处的相同数据分组进行解调，解码数据分组，执行信号的频谱分析等。测试结果可以在视觉上和通过使用预定义的测试度量彼此相关，包括 解调和解码参数的加权和，如调制消光比和码字误差。
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公开(公告)号：US11650266B2
公开(公告)日：2023-05-16
申请号：US17398079
申请日：2021-08-10
申请人： VIAVI SOLUTIONS, INC
发明人： Adam D. Gray , Daniel K. Chappell , Loren Eggert
IPC分类号： G01R31/52 , H04B17/354 , H01B7/32
CPC分类号： G01R31/52 , H01B7/32 , H04B17/354
摘要： Systems and methods for detecting leakage in a cable network system are disclosed. In at least some illustrative embodiments, a system may include a digital tagger operable to generate a digital tag including a chirp signal configured to be placed on a downstream signal path of the cable network system, and a cable network test instrument configured detect the digital tag in wireless signal data received from the cable network system when a point of ingress is presented in the cable network system. The network test instrument may be operable to provide a user-perceptible indication when the digital tag is detected to inform a technician or other user that a flaw in the cable network system is nearby.
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7.发明授权公开(公告)号：US11218189B1
公开(公告)日：2022-01-04
申请号：US17066899
申请日：2020-10-09
申请人： VIAVI SOLUTIONS INC.
摘要： A method and an apparatus providing common path distortion (CPD) detection from a field instrument, particularly when the source of the common path distortion is at a portion of the network beyond the subscriber's tap.
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8.发明授权公开(公告)号：US11677439B2
公开(公告)日：2023-06-13
申请号：US17558117
申请日：2021-12-21
申请人： VIAVI SOLUTIONS INC.
IPC分类号： H04B3/487
CPC分类号： H04B3/487
摘要： A method and an apparatus providing common path distortion (CPD) detection from a field instrument, particularly when the source of the common path distortion is at a portion of the network beyond the subscriber's tap.
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公开(公告)号：US10728595B2
公开(公告)日：2020-07-28
申请号：US15616720
申请日：2017-06-07
申请人： VIAVI SOLUTIONS INC.
IPC分类号： H04N7/173 , H04N21/24 , H04N21/61 , H04N21/442 , H04L12/28
摘要： A network test instrument is operable to conduct sweep tests with a cable modem termination system having a distributed architecture. Through signaling performed via a telemetry channel between the network test instrument and a sweep server, the network test instrument can initiate the sweep test. The sweep server communicates with the cable modem termination system to facilitate the sweep test between the network test instrument and the cable modem termination system.
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公开(公告)号：US20190304625A1
公开(公告)日：2019-10-03
申请号：US16370877
申请日：2019-03-29
发明人： Adam D. Gray , Daniel K. Chappell , Loren Eggert
IPC分类号： H01B7/32 , H04B17/354
摘要： Systems and methods for detecting leakage in a cable network system are disclosed. In at least some illustrative embodiments, a system may include a digital tagger operable to generate a digital tag including a chirp signal configured to be placed on a downstream signal path of the cable network system, and a cable network test instrument configured detect the digital tag in wireless signal data received from the cable network system when a point of ingress is presented in the cable network system. The network test instrument may be operable to provide a user-perceptible indication when the digital tag is detected to inform a technician or other user that a flaw in the cable network system is nearby.
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