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| Number | Title | Issue Date |
| 7574730 | Device and system for reducing confluence noise A system for reducing noise in a signal line, through which upward signals and downward signals are transmitted between a center and terminals, includes a noise-reduction device provided between the center and the terminals. The noise-reduction device attenuates the... | 08/11/2009 |
| 7509670 | Method and apparatus for locating a cleaner bandwidth in a frequency channel for data transmission Apparatus, methods, and computer program products for utilizing a frequency channel determined to be unacceptably noisy by finding a cleaner, narrower bandwidth within the frequency channel. Initially data is received on a frequency channel at a CMTS, specifically a... | 03/24/2009 |
| 7395548 | System and method for signal validation and leakage detection A system and method of validating signals and detecting signal leakage in a cable communications includes the steps of a) tuning a radio frequency receiver to a carrier frequency of a selected RF channel, b) measuring a signal level of the carrier frequency, c) off-... | 07/01/2008 |
| 7367039 | System and method for evaluating callback functionality in a satellite television network A combination of new hardware at the subscriber site, hardware and services at the satellite broadcasting center and new installation procedures provide a cost-effective approach for verifying “callback” functionality. The required test and monitoring hardware m... | 04/29/2008 |
| 7254827 | Ingress monitoring system and method A system for monitoring reverse paths of a bi-directional cable communication network such as a CATV network, to detect and analyze ingress signals entering a reverse path and ending at a network sub-headend or headend through a corresponding one of communication li... | 08/07/2007 |
| 7184466 | Radio frequency data conveyance system including configurable integrated circuits A data conveyance integrated system that can be utilized in a base station and/or end user devices in a wireless communication system. The integrated system includes first and second integrated circuits (ICs). The first IC includes a first serial-deserial (SERDES) m... | 02/27/2007 |
| 7162731 | Radio frequency characterization of cable plant and corresponding calibration of communication equipment communicating via the cable plant A switch router and one or more gateways incorporating a diagnostic and calibration system that performs RF characterization of an underlying cable plant. The switch router is connected at a point of insertion or point of distribution and each gateway is located dow... | 01/09/2007 |
| 7139283 | Robust techniques for optimal upstream communication between cable modem subscribers and a headend A number of features for enhancing the performance of a cable transmission system in which data is transmitted between a cable modem termination system at a headend and a plurality of cable modems located different distances from the headend. The power transmission ... | 11/21/2006 |
| 7120123 | Pre-equalization technique for upstream communication between cable modem and headend A number of features for enhancing the performance of a cable transmission system in which data is transmitted between a cable modem termination system at a headend and a plurality of cable modems located different distances from the headend. The power transmission ... | 10/10/2006 |
| 7088733 | Cable modem termination system for upstream frequency band The selection of which channel to use by a cable modem terminating system (CMTS) is made a function of input supplied by a spectrum analyzer. Note that typically the cable distribution system has coupled to it at the head end not only the CMTS but also a spectrum an... | 08/08/2006 |
| 7086083 | Noise measurement system A method of determining noise in a CATV channel, wherein the CATV channel comprises a predetermined frequency band, that employs digital signal processing to isolate the noise signal from an in-service television signal. The method includes an initial step of obtain... | 08/01/2006 |
| 7061857 | System and method for fault isolation for DSL loop extenders A system and method are disclosed to implement fault detection in DSL loop extenders. The system of the invention includes a plurality of loop extenders coupled to a local loop, a loop extender (LE) test box coupled to the local loop, and fault detection circuitry c... | 06/13/2006 |
| 7050721 | System having an impulse noise filter means A communication system comprises a network, such as a hybrid fibre coax (HFC) network, one or more optical transmitters and potential impulse noise sources for example electrical in-home equipment, as well as filter means coupled between the noise sources and the at... | 05/23/2006 |
| 7039432 | Dynamic upstream attenuation for ingress noise reduction A dynamic arrangement for reducing the presence of ingress noise in the upstream signal path of a two-way cable system utilizes a variable attenuation element and amplifier disposed along the upstream signal path. The amplifier includes a bypass switch so that the a... | 05/02/2006 |
| 7039939 | Method and apparatus for creating virtual upstream channels for enhanced lookahead channel parameter testing Methods, apparatus, and computer-readable media are disclosed for creating a virtual lookahead upstream receiver in a single physical upstream receiver in a CMTS, thereby avoiding having to dedicate an upstream receiver strictly for lookahead capability. A lookahead... | 05/02/2006 |
| 7024682 | Software controlled multi-mode bi-directional communication device Disclosed are a method and bi-directional communication device, such as a cable modem, for iteratively performing the following steps for each of a plurality of communications channels until a downstream data signal is detected. Selecting a communications channel an... | 04/04/2006 |
| 7024680 | Method and apparatus for detection and classification of impairments on a RF modulated network A method and apparatus for detecting and classifying RF impairments on the upstream path of a communication system is provided. The detection system detects frequencies with common path distortion impairments, and a system manager avoids transmission over those freq... | 04/04/2006 |
| 7006451 | Method and apparatus for performing wireless communication using a plurality of frequency channels A wireless communication apparatus performs wireless communication using a plurality of frequency channels. In order to prevent a radio signal from interfering with another wireless communication system, the apparatus includes a unit which detects an error rate of e... | 02/28/2006 |
| 7003414 | Monitoring system and method implementing failure time spectrum scan A channel plan with a corresponding test plan are implemented in connection with a plurality of nodes that communicate signals. The channel plan has one or more predefined specifications for each of one or more signal channels on each of the nodes. The channel plan ... | 02/21/2006 |
| 6980613 | Ultra-wideband correlating receiver A receiver for ultra-wideband communications is provided. One feature of the receiver architecture is that includes only a single correlator. The receiver may be used in wireless and wire communication mediums. The single correlator may be used to update a locally g... | 12/27/2005 |
| 6978474 | Media interface device A Residential Gateway (RG) for distributing video, data and telephone services to multiple devices within a residence is disclosed. The RG receives signals from a telecommunications network, converts the signals to formats compatible with the multiple devices, and t... | 12/20/2005 |
| 6973670 | In-building CATV system, down-converter, up-converter and amplifier In an in-building CATV system in which an upward signal is frequency-converted to an in-building upward signal using an up-converter at a terminal side and the frequency-converted in-building upward signal is outputted to an external system after frequency-convertin... | 12/06/2005 |
| 6965616 | Network data transmission synchronization system and method A number of features for enhancing the performance of a cable transmission system in which data is transmitted between a cable modem termination system at a headend and a plurality of cable modems located different distances from the headend. The power transmission ... | 11/15/2005 |
| 6931659 | Cable modem having a wireless communication function A cable modem uses a CATV network as an information transfer medium. To a cable modem proper that is connected by way of a coaxial cable to a CATV network, an expansion unit is attached that has a wireless LAN function that permits wireless communication with an inf... | 08/16/2005 |
| 6915530 | Ingress detection and characterization by time/frequency map The present invention encompasses a method and apparatus for detecting and characterizing one or more ingress events in the return band and creating a time/frequency map based on the detection of the ingress events. The time/frequency map is further characterized by... | 07/05/2005 |
| 6877166 | Intelligent power level adjustment for cable modems in presence of noise A technique is disclosed for selectively adjusting the power and/or frequency of cable modems without relying solely on the most recent measurement of these values to determine whether a change is necessary. Rather, it considers multiple recent measurements and from... | 04/05/2005 |
| 6775840 | Method and apparatus for using a spectrum analyzer for locating ingress noise gaps A device, system and method are disclosed for locating clean channels for upstream data carriers that are certain to have lower noise levels than the currently utilized channel used for carrying data upstream, thereby enabling intelligent placement of an upstream da... | 08/10/2004 |
| 6772437 | Cable modems and systems and methods for identification of a noise signal source on a cable network Cable modems are provided for measuring a noise signal power level on the upstream side of the cable network. The cable modem may be configured to make the signal power measurements at a variety of frequencies and at a selected bandwidth during a specified test time... | 08/03/2004 |
| 6728968 | Upward-joining-noise decreasing method and apparatus A method for decreasing upward-joining-noise in an upward-signal-inputting position of a center device includes the steps of: measuring a noise level of each of a plurality of upward signals supplied from a plurality of transmission lines; determining whether the me... | 04/27/2004 |
| 6725462 | Optimizing upstream transmission in a cable television distribution plant A method and apparatus for reducing delay distortion of upstream transmissions in a cable television (CATV) distribution plant. Upstream transmission in a CATV distribution plant, i.e., from the customer premises toward the head-end, is made difficult by delay disto... | 04/20/2004 |
| 6711743 | Method and apparatus for improvement in set-top box network performance A method and apparatus of enhancing communications in a set-top box having a high speed modem and a lower speed modem. A selected one of the modems can be used, depending upon noise and speed considerations, to receive a response packet by selectively substituting t... | 03/23/2004 |
| 6637033 | Signal splitter and gain adjustment system for a cable data system In a cable data system, frequency division multiplexed upstream data traffic is first split for subsequent signal processing. In the course of performing an analog RF signal splitting operation, signal splitter output amplitude is decreased as an artifact... | 10/21/2003 |
| 6574797 | Method and apparatus for locating a cleaner bandwidth in a frequency channel for data transmission Apparatus, methods, and computer program products for utilizing a frequency channel determined to be unacceptably noisy by finding a cleaner, narrower bandwidth within the frequency channel. Initially data is received on a frequency channel at a CMTS, spe... | 06/03/2003 |
| 6567987 | Digital optical transmitter with improved noise power ratio A cable television system (400) includes a transmitter (200) for generating a digital optical signal (204) and a receiver (300) for receiving said digital optical signal and converting it to an analog signal. The transmitter (200) includes a processor (23... | 05/20/2003 |
| 6567988 | Video signal transmission apparatus and video signal transmission method In transmitting the analog video signal via a coaxial cable, a transmission apparatus side is not provided with an emphasis characteristic which is the inverse to the frequency attenuation characteristic of the coaxial cable. In stead, an emphasis is appl... | 05/20/2003 |
| 6546557 | Method and system for enhancing digital video transmission to a set-top box A method and system for enhancing digital video transmission to set-top boxes improves the performance of a hybrid analog and digital video transmission system, for example, an AM-VSB QAM video transmission system, by selecting a digital channel map based... | 04/08/2003 |
| 6496982 | Device and method relating to cable TV networks A method and an apparatus transmit and receive information in a cable TV network including at least one base station connected to a branching cable network, branching from the base station to at least two subscribers, provided with transmitters. A unique ... | 12/17/2002 |
| 6449243 | Method of transmitting data in a communications network and communications network A method of transmitting data in a communications network and a communications network for carrying out the method are disclosed, the communications network having a plurality of network terminations 1 which are connected to a head end 2 via data channels... | 09/10/2002 |
| 6425132 | Ingress testing of CATV system utilizing remote selection of CATV node A CATV system in which a technician in the field requests via a field client that a node of the CATV system be tested for ingress. The CATV system includes a headend facility that is coupled to a CATV distribution network. The CATV distribution network in... | 07/23/2002 |
| 6385773 | Method and apparatus for upstream frequency channel transition Transitions among different upstream frequency channels in a cable television plant in order to transmit data occur while considering the noise level of the upstream frequency channel presently being used to transmit data. By taking into account the noise... | 05/07/2002 |
