公开(公告)号：US09893764B2

公开(公告)日：2018-02-13

申请号：US15497874

申请日：2017-04-26

申请人： VIAVI SOLUTIONS INC.

发明人： Adam D. Gray ,  Daniel K. Chappell ,  Ching-Chang Liao

IPC分类号： H04B3/46 ,  H04L12/26 ,  H04L29/06

CPC分类号： H04B3/46 ,  H04L43/0847 ,  H04L43/0858 ,  H04L43/106 ,  H04L43/50 ,  H04L69/22 ,  H04W24/08

摘要： Apparatus and method are provided for obtaining an upstream signal spectrum as it was during a time of transmission of a received upstream data packet. The apparatus includes an analog-to-digital converter (ADC), a packet detector coupled to ADC, and a spectrum calculation unit coupled to the ADC and the packet detector. In operation, the spectrum calculation unit computes a spectrum of the digitized upstream signal as it was between the start and end times of the first packet. As a result, the obtained spectrum is representative of a condition of the transmission path during transmission of the upstream data packet.

公开(公告)号：US09774847B2

公开(公告)日：2017-09-26

申请号：US15160739

申请日：2016-05-20

申请人： Viavi Solutions Inc.

发明人： Daniel K. Chappell ,  Richard Earl Jones, Jr. ,  David W. Jones ,  Adam D. Gray

IPC分类号： H04N21/633 ,  H04N17/00 ,  H04N7/173

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.

公开(公告)号：US20220137154A1

公开(公告)日：2022-05-05

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 ,  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.

公开(公告)号：US11239924B2

公开(公告)日：2022-02-01

申请号：US16910635

申请日：2020-06-24

申请人： VIAVI SOLUTIONS INC.

发明人： Loren R. Eggert ,  Daniel K. Chappell

IPC分类号： H04B3/46 ,  H04B17/21 ,  H04B17/336 ,  H04L1/20 ,  H04L1/00 ,  H04B17/26

摘要： A method, apparatus and system for per-channel MER calibration and determination on a multi-channel receiver.

公开(公告)号：US10986331B2

公开(公告)日：2021-04-20

申请号：US16872091

申请日：2020-05-11

申请人： VIAVI SOLUTIONS INC.

发明人： Kyle Harris ,  Daniel K. Chappell

IPC分类号： H04N7/173 ,  H04N17/00 ,  H04B3/46

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.

公开(公告)号：US10594364B2

公开(公告)日：2020-03-17

申请号：US15164197

申请日：2016-05-25

申请人： VIAVI SOLUTIONS INC.

发明人： Ben Maxson ,  Daniel K. Chappell ,  Jim Walsh

IPC分类号： H04N21/262 ,  H04B3/46 ,  H04N7/10 ,  H04N17/00 ,  H04N21/61 ,  H04L27/26 ,  H04N21/4402 ,  H04N21/2343 ,  H04H20/12 ,  H04L12/28 ,  H04N21/2383 ,  H04N21/422 ,  H04B17/00

摘要： Methods and devices for characterization of repetitious noise in cable networks are disclosed. A frequency band of interest is identified, a time trace of a signal parameter within the frequency band is obtained, and an autocorrelation of the time trace is computed to detect repetitious noise. The repetition frequency can serve as an indicator of the noise source type, and thus it can assist in noise segmentation.

公开(公告)号：US20160336998A1

公开(公告)日：2016-11-17

申请号：US15164197

申请日：2016-05-25

申请人： VIAVI SOLUTIONS INC.

发明人： Ben MAXSON ,  Daniel K. Chappell ,  Jim Walsh

IPC分类号： H04B3/46 ,  H04B17/00 ,  H04L27/26

摘要： Methods and devices for characterization of repetitious noise in cable networks are disclosed. A frequency band of interest is identified, a time trace of a signal parameter within the frequency band is obtained, and an autocorrelation of the time trace is computed to detect repetitious noise. The repetition frequency can serve as an indicator of the noise source type, and thus it can assist in noise segmentation.

摘要翻译： 公开了用于表征电缆网络中的重复噪声的方法和装置。 识别感兴趣的频带，获得频带内的信号参数的时间轨迹，并且计算时间轨迹的自相关以检测重复噪声。 重复频率可以作为噪声源类型的指标，因此可以帮助噪声分割。