公开(公告)号：US20240146414A1

公开(公告)日：2024-05-02

申请号：US18370838

申请日：2023-09-20

Applicant: ARRIS Enterprises LLC

Inventor： Vasudevan JOTHILINGAM ,  Kumara Swamy TADIKAVAGILU VENKATAPPA

IPC: H04B10/2575

CPC classification number: H04B10/25751 ,  H04L49/901

Abstract: A cable distribution system that includes a headend connected to a plurality of customer devices through a transmission network that includes a remote fiber node that converts digital data to analog data suitable for the plurality of customer devices. The remote fiber node receiving a downstream external protocol interface packet that includes a header portion and a data portion in memory. The remote fiber node encoding and transmitting the data portion to at least one of the plurality of customer devices, wherein the data portion is transferred from the memory using direct memory access based upon a buffer descriptor for the encoding.

公开(公告)号：US11949454B2

公开(公告)日：2024-04-02

申请号：US17829509

申请日：2022-06-01

Applicant: TECHNETIX B.V.

Inventor： Martien Rijssemus ,  Matthijs Laro

IPC: H04B10/2575 ,  H04B10/25

CPC classification number: H04B10/25891 ,  H04B10/25751

Abstract: There is provided an optical network device (30) comprising separate downstream and upstream signal paths (33, 34) disposed between a wavelength division multiplexing unit (16) and a signal splitting element (32, 44, 50), an optical to electrical signal converter (18) disposed in the downstream path and an electrical to optical signal converter (22) disposed in the upstream path, wherein the signal splitting element (32, 44, 50) is capable of splitting signals independent of signal frequency and is configured with an isolation of 30 to 50 dB thereby to substantially prevent leakage of downstream signals into upstream path (34). The signal splitting element is capable of splitting signals independent of signal frequency and may be a directional coupler, two-way signal splitter or hybrid coupler comprising at least two different types of coupler element.

公开(公告)号：US11894641B2

公开(公告)日：2024-02-06

申请号：US17864180

申请日：2022-07-13

Applicant: HOLLAND ELECTRONICS LLC

Inventor： Michael Holland ,  George Goebel

IPC: H01R13/44 ,  H01R25/00 ,  H01R33/76 ,  H01R33/945 ,  H01R31/02 ,  H04B10/2575 ,  H01R33/88 ,  H01R13/447

CPC classification number: H01R25/003 ,  H01R31/02 ,  H01R33/76 ,  H01R33/88 ,  H01R33/945 ,  H04B10/25751 ,  H01R13/447 ,  H01R2201/18

Abstract: A coaxial tap in a hybrid fiber coaxial cable distribution system serves subscribers with an RF signal.

公开(公告)号：US11863145B1

公开(公告)日：2024-01-02

申请号：US17945600

申请日：2022-09-15

Applicant: Applied Optoelectronics, Inc.

Inventor： Rafael Celedon ,  Steven Blashewski ,  Mark Siejka ,  David Stewart ,  Stéphane Chapeau

IPC: H03G3/30 ,  H04B17/21 ,  H04B10/2575

CPC classification number: H03G3/3068 ,  H04B17/21 ,  H04B10/25751

Abstract: Automatic gain control (AGC) may be accomplished in a radio frequency (RF) amplifier in a hybrid fiber-coaxial (HFC) network using a wideband RF tuner to select multiple pilot channels (e.g., frequencies in lower and upper portions of an RF signals spectrum) for use in measuring power and determining a correction to be applied to the RF amplifier. The power of the pilot channel or channels may be measured, for example, using a received signal strength indicator (RSSI) from the wideband RF tuner or using a power detector circuit. Using the wideband RF tuner allows selectable gain and/or tilt control across a wideband spectrum, such as a channel spectrum of a CATV downstream RF signal, to maintain stable RF output levels of the amplifier as RF input levels vary. The RF amplifier may be a line extender amplifier used in a CATV HFC network to amplify a wideband RF spectrum of up to 1.8 GHz.

公开(公告)号：US11646763B2

公开(公告)日：2023-05-09

申请号：US17063480

申请日：2020-10-05

Applicant: CABLE TELEVISION LABORATORIES, INC

Inventor： Mark Poletti ,  HsinChih Lin ,  Vaibhav Singh

IPC: H04B3/487 ,  H04L12/24 ,  H04L12/26 ,  H04L5/00 ,  H04B10/2575 ,  H04L43/0823 ,  H04L41/0213

CPC classification number: H04B3/487 ,  H04B10/25751 ,  H04L5/0062 ,  H04L41/0213 ,  H04L43/0823 ,  H04L43/0847

Abstract: A communication device in a communication network includes at least one processor. The processor is configured to identify a first management information base (MIB) of a first occupied channel in the communication network, and a second MIB of a second occupied channel in the communication network adjacent the first occupied channel. The second occupied channel occupies a frequency band overlapping with an interfering signal band. The processor is further configured to calculate at least one proactive network maintenance (PNM) metric for each of the first and second MIB, and determine, from the calculated PNM metric, that an ingress of the interfering signal is detected on the second occupied channel.

公开(公告)号：US20190222310A1

公开(公告)日：2019-07-18

申请号：US16125824

申请日：2018-09-10

Applicant: ARCOM DIGITAL, LLC

Inventor： Victor M. Zinevich

IPC: H04B10/079 ,  H04B10/2575 ,  H04B10/2507

CPC classification number: H04B10/0795 ,  G01R23/20 ,  G01R31/2822 ,  H04B3/487 ,  H04B10/2507 ,  H04B10/25751 ,  H04L1/248 ,  H04M3/304

Abstract: Detecting PIM in a downstream signal, wherein the downstream signal is received from a cable plant via a subscriber network and an upstream signal is transmitted to the cable plant via the subscriber network. The upstream signal is transmitted in bursts during active intervals. PIM arises from an interaction between the upstream signal and a nonlinear component in the subscriber network and occurs in bursts corresponding to the upstream signal. The detection steps are: (a) identifying the potentially affected downstream signal from the upstream signal; (b) receiving the downstream signal during an active interval; (c) measuring a metric of the downstream signal to obtain an active value; (d) receiving the downstream signal during a quiet interval; (e) measuring the metric of the downstream signal to obtain a quiet value; (f) comparing active and quiet values; and (g) determining whether PIM distortion has been detected based on the comparison.

公开(公告)号：US20190116057A1

公开(公告)日：2019-04-18

申请号：US16158349

申请日：2018-10-12

Applicant: Teleste Oyj

Inventor： Carlos Colson ,  Kari Mäki ,  Sami Halen

IPC: H04L12/28 ,  H04N21/61 ,  H04N7/10

CPC classification number: H04L12/2801 ,  H04B10/25751 ,  H04N7/102 ,  H04N21/6118 ,  H04N21/6168

Abstract: A network element of a cable television (CATV) network, comprising an input for signal transmission; at least two diplex filters configured to be connected to said input, a first diplex filter comprising bandpass filters for a first upstream and downstream frequency bands and a second diplex filter comprising bandpass filters for a second upstream and downstream frequency bands, wherein an upper frequency edge of the second upstream frequency band is higher than an upper frequency edge of the first upstream frequency band and higher than or equal to a lower frequency edge of the first downstream frequency band and a lower frequency edge of the second downstream frequency band is higher than the upper frequency edge of the second upstream frequency band; a control circuit for measuring energy of radio frequency signals below said second downstream frequency band; and a switch for connecting one of said at least two diplex filters to said input, wherein said control circuit is configured to control the switch to connect the first diplex filter to said input in response to the energy of radio frequency signals below said second downstream frequency band exceeding a threshold value; or connect the second diplex filter to said input in response to the energy of radio frequency signals below said second downstream frequency band at most reaching the threshold value.

公开(公告)号：US09973278B2

公开(公告)日：2018-05-15

申请号：US15075512

申请日：2016-03-21

Applicant: ARRIS Enterprises LLC

Inventor： Jun Wang ,  Venkatesh G. Mutalik ,  Marcel F. Schemmann ,  Shamsuddin H. Chasmawala

IPC: H04B10/04 ,  H04B10/516 ,  H04B10/2575 ,  H04B10/58 ,  H04B10/2537

CPC classification number: H04B10/5161 ,  H04B10/2537 ,  H04B10/2575 ,  H04B10/25751 ,  H04B10/58

Abstract: Techniques for transmitting an optical signal through optical fiber with an improved stimulated Brillouin scattering (SBS) suppression and an improved transmitter's signal to noise ratio (SNR) include externally modulating a light beam emitted from a light source with a high frequency signal. The light beam is also modulated externally with an RF information-carrying signal. The high frequency signal is at least twice a highest frequency of the RF signal. The high frequency signal modulating the light source can be split, providing a portion of the split signal to a phase and gain control circuit for adjusting a phase/gain. The output of phase and gain control circuit can be applied to the external modulator to eliminate intensity modulation for SBS suppression improvement. The optical transmitter's SNR is further improved by cancelling a beat between SBS suppression modulation tone and out of band distortion spectrum of information bearing RF signal.

公开(公告)号：US09900634B2

公开(公告)日：2018-02-20

申请号：US13843996

申请日：2013-03-15

Applicant: General Instrument Corporation

Inventor： David B Bowler ,  Clarke V. Greene ,  John Holobinko ,  Gerard White ,  Xinfa Ma ,  Shaoting Gu ,  Xiang He ,  Lawrence M. Hrivnak ,  Steven H. Hersey

IPC: H04N21/2383 ,  H04N21/426 ,  H04N21/61 ,  H04N5/44 ,  H04B10/2575 ,  H04N21/222 ,  H04N21/238 ,  H04N21/2385 ,  H04N21/24 ,  H04N21/2662

CPC classification number: H04N21/2383 ,  H04B10/25751 ,  H04N5/4401 ,  H04N21/2221 ,  H04N21/23805 ,  H04N21/2385 ,  H04N21/2402 ,  H04N21/2662 ,  H04N21/42676 ,  H04N21/6118 ,  H04N21/615

Abstract: Improved systems and methods for delivering CATV content over a fiber optic network from a transmitter. The transmitter preferably monitors performance attributes of a transmitted signal and selectively configures the transmitter based on the monitored attributes.

公开(公告)号：US09894426B2

公开(公告)日：2018-02-13

申请号：US14979825

申请日：2015-12-28

Applicant: Maxlinear, Inc

Inventor： Sridhar Ramesh ,  Curtis Ling

IPC: H04B10/27 ,  H04Q11/00 ,  H04B10/40 ,  H04B10/2575

CPC classification number: H04Q11/0062 ,  H04B10/25751 ,  H04B10/27 ,  H04B10/271 ,  H04B10/40

Abstract: Circuitry of a hybrid fiber-coaxial network may comprise a first transceiver configured to connect the circuitry to an optical link, a second transceiver configured to connect the circuitry to an electrical link, a first processing path, a second processing path, and a switching circuit. In a first configuration, the switching circuit may couple the first transceiver to the second transceiver via the first processing path. In a second configuration, the switching circuit may couple the first transceiver to the second transceiver via the second processing path. The first transceiver may comprise a passive optical network (PON) transceiver and the second transceiver may comprise a data over coaxial service interface specification (DOCSIS) physical layer transceiver. The switching circuit may be configured based on the type of headend to which the circuitry is connected.