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7613395 |
Optical network termination apparatus with shared components and passive optical network system comprising same
A transmission system for a passive optical network comprises a shared optical transmission apparatus, a shared electrical interface apparatus and a plurality of transmission convergence...
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7600240 |
Data processing apparatus and method
Video presentation timing can match sounding timing with high accuracy. A digital broadcast receiver calculates the presentation delay time dt from the presentation time when video based on the...
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7599624 |
System and method for switching channels using tunable laser diodes
A channel switching function is added to a wavelength division multiplexing passive optical network (WDM-PON) system, which is an access optical network system, and the potential transmission rate...
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7594252 |
Early warning fault identification and isolation system for a two-way cable network
Set top boxes (STBs) connected to the HFC cable network are “pinged” and their responses recorded. The two most responsive STBs in each node of the HFC cable network are identified. The most...
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7594249 |
Network interface device and broadband local area network using coaxial cable
A local area network uses coaxial cable wiring for interconnection of terminal devices. A frequency selective network interface device is placed at the building point of entry or another point in...
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7593638 |
Secure upstream transmission in passive optical networks
A method and system for ensuring confidentiality of signal transmission in a point-to-multi point data transmission network like Ether net passive optical network, including at least one hub, at...
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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...
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7533403 |
Apparatus and method for distributing audio and video content using existing network wiring
An apparatus, system and method are described which allows multimedia signals received from one or more content providers (e.g., cable television providers, Internet content providers, . . . etc)...
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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....
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7487112 |
System, method, and computer program product for providing location based services and mobile e-commerce
A system, method, apparatus and computer program product for providing location based functions and mobile e-commerce comprising a central processing unit including a processor, a storage device,...
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7457542 |
Optical access network system
An optical access network system having a function of correcting upstream signal waveform distortions occurring in the PON section, wherein a central office side apparatus comprises a main...
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7450850 |
Fiber and wire communication system
This invention provides a new architecture for a communication system between head-ends and end-users which expands bandwidth and reliability of the communication system. A mux-node receives...
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7254828 |
Multiple input data receiver for cable television systems
A multiple input data receiver for bi-directional cable television (CATV) systems simultaneously monitors and selectively receives a return path signal on a plurality of return paths. When an...
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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...
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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...
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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...
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6985437 |
Method for dynamic performance optimization in a data-over-cable system
A method and system for optimizing performance in a data-over-cable system. The method includes determining parameters for data transmission on an upstream channel of the data-over-cable system,...
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6978476 |
Device and method of determining location of signal ingress
The present invention comprises a device which may be attached to a cable ground block ( 62 ) such that the level and type for signal emitted through the upstream flow of the signal, from a...
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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...
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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...
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6880170 |
Ingress detection and attenuation
The present invention encompasses a method and apparatus for ingress detection and attenuation. When a determination is made that the level of ingress in a return frequency band has exceeded a...
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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...
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6868552 |
Ingress noise control system and ingress noise blocking device
The present invention concerns an ingress noise control system and an ingress noise blocking device which are used in a cable system to suppress ingress noise. In the cable system providing two-way...
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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...
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6757910 |
Adaptive filter for reducing ingress noise in CATV return signals
An adaptive high pass filter is used to reduce signal noise such as that occurring on a CATV upstream carrier. A signal detector senses a lowest active frequency on a CATV transmission. A high pass...
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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...
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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...
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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...
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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...
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6530087 |
Cable network system with ingress noise suppressing function
In a cable network system of this invention, GSUs are installed in almost all subscriber residences. A G-STB or a G-MDM is set for a subscriber who wants to receive bidirectional services....
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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...
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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...
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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...
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6360369 |
Interference tolerant modem
A system for the removing of interference (ingress) in cable modems without reducing the data rate or changing the frequency of the signal. The invention comprises both, a variable band stop filter...
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6327709 |
Method and apparatus for filtering interference and nonlinear distortions
Interference and/or nonlinear distortions are reduced in a signal communicated from a transmitter to a receiver. To reduce interference, the transmitter is momentarily disrupted, during which time...
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6321384 |
Noise reduction in cable return paths
A method of reducing noise and ingress in cable return paths is disclosed in which the return frequency spectrum is divided into two regions; one frequency region being for transmissions from...
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6292944 |
Return path ingress in a two-way CATV system
A method and apparatus for locating the source of noise ingress into a CATV system return path by coupling a filter having a passband in the noise frequency bandwidth to the nodes between adjacent...
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6166760 |
Ingress noise measuring device in data communication network using CATV network
There is provided an ingress noise measuring device for each subscriber's terminal in a data communication network using a cable television (CATV) network. The ingress noise measuring device has a...
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6094211 |
TV and data cable system ingress noise blocker
This invention permits the upstream transmission of short packets of information in a cable TV system, and blocking upstream noise at all other times, and does so without interfering with image...
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6091932 |
Bidirectional point to multipoint network using multicarrier modulation
A two-way point to multipoint data transmission system comprises an upstream unit, a plurality of downstream units, and a transmission line connecting the downstream units to the upstream unit. At...
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6006066 |
Transmission system with tap devices which reduce the effects of interference
A transmission system with a number of tap devices (1), which are connected to a distribution network (9). Subscriber terminals (11) can be connected to each tap device (1) present in a building...
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5999796 |
Return path attenuation filter
The present invention is a passive filter for controlling the return path loss in a communication system having a forward path and return path. The filter comprises first and second terminals, a...
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5966410 |
Method and system for cleaning a frequency band
A cable system (10) has a plurality of CAUs (34) coupled to a variety of network devices (58-68) in the subscriber's premise (36). The network devices (58-68) transmit signals to the CAU (34) in a...
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5963844 |
Hybrid fiber-coax system having at least one digital fiber node and increased upstream bandwidth
Increased upstream bandwidth and reduced ingress noise in a shared hybrid fiber-coax transmission system (100) are obtained by modulating at least a portion of upstream signals received from...
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5956073 |
Noise-limiting transformer apparatus and method for making
Embodiments of the invention include a transformer device having a saturation region for limiting ingress noise and other noise. The transformer comprises a magnetic core, an input coil and an...
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5937330 |
Settop terminal controlled return path filter for minimizing noise ingress on bidirectional cable systems
A device which eliminates all RF ingress noise from entering the CATV network in the upstream communication path includes a shunt filter, a detector and a filter with a bandwidth equal to the...
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5915205 |
Ingress noise cancellation for upstream signals on a cable television system using an antenna to determine local noise
A cable television system employs noise cancellation in order to reduce radio frequency noise for upstream signals. The noise cancellation can be located at the headend or located at the juncture...
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5893024 |
Data communication apparatus and method thereof
A method and apparatus for reducing ingress noise (304) in the upstream frequency band and reducing power consumption in a cable communication system (200) by not allowing signals generated in the...
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5881363 |
Method and apparatus for combatting ingress and multipath in a CATV return channel
In a CATV return channel between a transmitter and a headend receiver, the transmitter is provided with a precoder having programmable but fixed coefficients. The receiver is provided with an...
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5881362 |
Method of ingress noise reduction in calbe return paths
A method of reducing noise and ingress in cable return paths is disclosed in which the return frequency spectrum is divided into two regions; one frequency region being for transmissions from...
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