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：US11621884B2

公开(公告)日：2023-04-04

申请号：US15964890

申请日：2018-04-27

申请人： VIAVI SOLUTIONS INC.

发明人： Daniel Keith Chappell ,  Loren Eggert

IPC分类号： H04L41/0677 ,  H04L43/50 ,  G01R31/11 ,  H04B3/46 ,  G01R31/08

摘要： A test instrument connectable to a cable television (CATV) network to provide a high resolution time domain reflectometry (TDR) in a fault location measurement is disclosed. The test instrument may have a port connectable to a test point in the CATV network. The test instrument may also have a processing circuit to perform a calibration measurement and a fault location measurement by transmitting frequency-chirped probe pulses into a closed calibration circuit within the test instrument, and receiving return signals at an analog-digital converter in the test instrument. The processing circuit may resample the calibration measurement and the fault location measurement at a high sampling rate, cross-correlate the fault location with the calibration measurement to generate a cross-correlation TDR waveform, and generate a new TDR waveform using a refinement processing technique to remove echoes from the cross-correlation TDR waveform.

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.

公开(公告)号：US11121807B2

公开(公告)日：2021-09-14

申请号：US16785778

申请日：2020-02-10

申请人： Viavi Solutions Inc.

发明人： Robert Flask ,  Loren Eggert

IPC分类号： H04L1/00 ,  H04L5/00

摘要： A method, an apparatus and a system for determining stress on a low density parity check (LDPC) process for a network using orthogonal frequency division multiplexing (OFDM).

公开(公告)号：US11085973B2

公开(公告)日：2021-08-10

申请号：US16370877

申请日：2019-03-29

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

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：US20190229981A1

公开(公告)日：2019-07-25

申请号：US15964890

申请日：2018-04-27

申请人： VIAVI SOLUTIONS INC.

发明人： Daniel Keith CHAPPELL ,  Loren Eggert

IPC分类号： H04L12/24

摘要： A test instrument connectable to a cable television (CATV) network to provide a high resolution time domain reflectometry (TDR) in a fault location measurement is disclosed. The test instrument may have a port connectable to a test point in the CATV network. The test instrument may also have a processing circuit to perform a calibration measurement and a fault location measurement by transmitting frequency-chirped probe pulses into a closed calibration circuit within the test instrument, and receiving return signals at an analog-digital converter in the test instrument. The processing circuit may also resample the calibration measurement and the fault location measurement at a high sampling rate, cross-correlate the fault location with the calibration measurement to generate a cross-correlation TDR waveform, and generate a new TDR waveform using a refinement processing technique to remove echoes from the cross-correlation TDR waveform. The cross-correlation TDR waveform generation steps may be repeated until the new TDR waveform meets a predetermined threshold. The processing circuit may then output new TDR waveform at an output.

公开(公告)号：US11575468B2

公开(公告)日：2023-02-07

申请号：US17399496

申请日：2021-08-11

申请人： Viavi Solutions Inc.

发明人： Robert Flask ,  Loren Eggert

IPC分类号： H04L1/00 ,  H04L5/00

摘要： A method, an apparatus and a system for determining stress on a low density parity check (LDPC) process for a network using orthogonal frequency division multiplexing (OFDM).

公开(公告)号：US20190304625A1

公开(公告)日：2019-10-03

申请号：US16370877

申请日：2019-03-29

申请人： VIAVI SOLUTIONS, INC.

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.