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：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：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.