公开(公告)号：US20170324490A1

公开(公告)日：2017-11-09

申请号：US15489313

申请日：2017-04-17

申请人： VIAVI SOLUTIONS INC.

发明人： Al RUTH ,  Rodney Harbison Weaver ,  Koji Okamoto

IPC分类号： H04B17/354 ,  H04L27/34 ,  H04B3/32

CPC分类号： H04B17/354 ,  H04B3/32 ,  H04L27/34

摘要： A signal leakage in a cable network may be detected by using a test device to obtain a spectrum of an electromagnetic wave propagating in vicinity of the cable network, and automatically detecting QAM channels in the obtained spectrum by detecting characteristic spectral roll-offs at boundary frequencies between QAM channels of the cable network. A test device may be used to determine which QAM channels are currently active on the cable network, thereby facilitating automatic QAM signal leakage detection.

公开(公告)号：US11956575B2

公开(公告)日：2024-04-09

申请号：US18350355

申请日：2023-07-11

申请人： Viavi Solutions Inc.

发明人： David Hering ,  Karl Oberlin ,  Koji Okamoto

IPC分类号： H04B10/079 ,  H04Q11/00 ,  H04L49/356

CPC分类号： H04Q11/0062 ,  H04B10/0791 ,  H04B10/0795 ,  H04L49/357 ,  H04Q2011/0083

摘要： Mapping of ports to other network components is generated by physically bending a fiber optic cable and then determining which optical network terminals experience a signal power loss (or receive attenuated signals) based on the bending. The physical bending can be done using a bending tool and the optical network terminals that experience the signal power loss can be identified using a back-end database operation. Generally, the correspondence between the physical bending and the power loss at the downstream components and or upstream components of the network is used to create the mapping of the ports at the splitter level.

公开(公告)号：US20190319669A1

公开(公告)日：2019-10-17

申请号：US16358319

申请日：2019-03-19

申请人： VIAVI SOLUTIONS INC.

发明人： Ben MAXSON ,  Koji Okamoto

IPC分类号： H04B3/46 ,  H04N17/00

摘要： Non-disruptive sweep measurements using low power coherent signals overcome the limitations of prior art frequency response systems for cable networks. Modulated or unmodulated, e.g. continuous wave (CW), test signals are transmitted into the network at a first or input point (input point is in the head end for forward sweep; input point is in the field for reverse sweep). The test signals are transmitted continuously at multiple frequencies, so as a composite they form a wideband, OFDM-like (orthogonal frequency-division multiplexing) waveform. A receiver at a second or output point generates power reading measurements, from which the frequency response of the network is produced.

公开(公告)号：US10404388B2

公开(公告)日：2019-09-03

申请号：US16176924

申请日：2018-10-31

申请人： VIAVI SOLUTIONS INC.

发明人： Al Ruth ,  Rodney Harbison Weaver ,  Koji Okamoto

IPC分类号： H04B17/354 ,  H04L27/34 ,  H04B3/32

摘要： A signal leakage in a cable network may be detected by using a test device to obtain a spectrum of an electromagnetic wave propagating in vicinity of the cable network, and automatically detecting QAM channels in the obtained spectrum by detecting characteristic spectral roll-offs at boundary frequencies between QAM channels of the cable network. A test device may be used to determine which QAM channels are currently active on the cable network, thereby facilitating automatic QAM signal leakage detection.

公开(公告)号：US10148371B2

公开(公告)日：2018-12-04

申请号：US15489313

申请日：2017-04-17

申请人： VIAVI SOLUTIONS INC.

发明人： Al Ruth ,  Rodney Harbison Weaver ,  Koji Okamoto

IPC分类号： H04B3/46 ,  H04B17/354 ,  H04L27/34 ,  H04B3/32

摘要： A signal leakage in a cable network may be detected by using a test device to obtain a spectrum of an electromagnetic wave propagating in vicinity of the cable network, and automatically detecting QAM channels in the obtained spectrum by detecting characteristic spectral roll-offs at boundary frequencies between QAM channels of the cable network. A test device may be used to determine which QAM channels are currently active on the cable network, thereby facilitating automatic QAM signal leakage detection.

公开(公告)号：US10601465B2

公开(公告)日：2020-03-24

申请号：US16358319

申请日：2019-03-19

申请人： VIAVI SOLUTIONS INC.

发明人： Ben Maxson ,  Koji Okamoto

IPC分类号： H04N7/173 ,  H04B3/46 ,  H04N17/00 ,  H04N21/443

摘要： Non-disruptive sweep measurements using low power coherent signals overcome the limitations of prior art frequency response systems for cable networks. Modulated or unmodulated, e.g. continuous wave (CW), test signals are transmitted into the network at a first or input point (input point is in the head end for forward sweep; input point is in the field for reverse sweep). The test signals are transmitted continuously at multiple frequencies, so as a composite they form a wideband, OFDM-like (orthogonal frequency-division multiplexing) waveform. A receiver at a second or output point generates power reading measurements, from which the frequency response of the network is produced.

公开(公告)号：US09660742B2

公开(公告)日：2017-05-23

申请号：US15169318

申请日：2016-05-31

申请人： VIAVI SOLUTIONS INC.

发明人： Al Ruth ,  Rodney Harbison Weaver ,  Koji Okamoto

IPC分类号： H04B3/46 ,  H04B17/354 ,  H04L27/34 ,  H04B3/32

CPC分类号： H04B17/354 ,  H04B3/32 ,  H04L27/34

摘要： A signal leakage in a cable network may be detected by using a test device to obtain a spectrum of an electromagnetic wave propagating in vicinity of the cable network, and automatically detecting QAM channels in the obtained spectrum by detecting characteristic spectral roll-offs at boundary frequencies between QAM channels of the cable network. A test device may be used to determine which QAM channels are currently active on the cable network, thereby facilitating automatic QAM signal leakage detection.