202results about "Systems with measurements/testing channels" patented technology

A powerline communications device comprises a powerline communications interface and at least one other communications interface configured to communicate over a computing network. The powerline communications interface is further configured to receive electrical power. The computing network may comprise mediums including powerlines, telephone lines, and / or coaxial cables. In some embodiments, the powerline communications interface may communicate with a network apparatus, such as a personal computer, via an Ethernet interface. The powerline interface, the telephone line interface, and / or the coaxial cable interface may all be associated with the same media access control (MAC) address. The powerline communications device may receive a message via a first medium and repeat the message via a second medium based on a quality of service (QoS) metric. In some embodiments, the powerline communications device may communicate using multiple frequency bands.

Reducing a power of a signal electromagnetically coupled from a PLC medium to a digital subscriber line (DSL) medium. The method involves transmitting a data signal over the PLC medium at a first average power level from one of a plurality of PLC transmitters coupled to the PLC medium, then measuring first noise associated with a first signal received at a DSL receiver coupled to the DSL communication medium caused at least in part by the data signal transmitted over the PLC medium at a second average power level from the one PLC transmitter, the second average power level different than the first average power level, followed by measuring second noise associated with a second signal received at the DSL receiver coupled to the DSL communication medium caused at least in part by the data signal transmission over the PLC medium at the second average power level. A transmit power spectral density (PSD) for the data signal transmitted by the one PLC transmitter over the PLC medium is then changed, based on a difference between the first noise and the second noise, such that the changed transmit PSD for the data signal transmitted by the one PLC transmitter over the PLC medium reduces the power of the signal electromagnetically coupled from the PLC medium to the DSL medium caused by the data signal transmission from the one PLC transmitter over the PLC medium.

A method for providing power line communications in a multi-unit building is provided. One embodiment includes determining the quality of a communication link associated with each of a plurality of communication nodes, selecting one of the plurality of communication nodes based, at least in part, on the quality of the communication links associated with the communication nodes; and establishing communications with an external network through the selected one communication node. In addition, in some embodiments at least one of the communication links associated with the plurality of communication nodes includes a non-conductive radio frequency coupled segment.

From an electric pole outside to a cordless handset inside a building / facility, a communication line is established via an electric power line. At this point, it is judged whether or not electric power line communication is possible, and if electric power line communication is possible, the communication line between the cordless handset and a base unit is switched to an electric power line communication system, and a communication line is formed via an optical fiber cable from the electric power line. By measuring the communication quality levels of all lines of the wireless and electric power lines, the communication line having the highest communication quality level may be selected.

In conjunction with a wiring in a house carrying data network signal, a modular outlet comprising of a base module and interface module. The base module connects to the wiring and attached to a wall. The interface module provides a data unit connection. The interface module is mechanically attached to the base module and electrically connected thereto. The wiring may also carry basic service signal such as telephone, electrical power and cable television (CATV). In such a case, the outlet will provide the relevant connectivity either as part of the base module or as part of the interface module. Both proprietary and industry standard interfaces can be used to interconnect the module. Furthermore, a standard computer expansion card (such as PCI, PCMCIA and alike) may be used as interface module.

Fault detection and power network quality monitoring are performed for a power line network using power line communications (“PLC”) signal transceiving and data processing capabilities. Power line signals are continuously received and processed to obtain signal data representative of power line network operating conditions that are expressed in the received power line signals. The harmonic content and noise signature of the signal data are evaluated with reference to known fault signature data and power line network topology properties for detecting and identifying the location of an existing or anticipated fault in the power line network and assessing power transmission quality of the network.

A system, computer program product and method to provide information related to a power distribution system based on information provided by a plurality of network elements electrically connected to a plurality of power lines of the power distribution system at a plurality of locations is provided. In one embodiment, the method comprises receiving a notification from a group of network elements that have detected a voltage signature indicating an imminent power outage, determining location information of the power outage, outputting the location information of the power outage, receiving a live notification from a first network element of the group of network elements indicating a first power restoration at a location of the first network element, determining location information of the first power restoration, and outputting the location information of the first power restoration.

A method and system for providing coexistence of power line communication technologies on a common powerline and to communicate with each other. A plurality of devices is provided, each of a different and non-compatible powerline communication technologies. A set of predefined beacon signals for each device is also provides, each signal having a frequency bands. The bands are continuously monitoring for activity. From the activity, necessary changes are derived to accommodation modes to identify devices which may operate outside a norm causing the network of devices to operate incorrectly.

A non-invasive powerline communications system includes: means for generating communication signals at a first location for transmission on a powerline; means for reactively coupling the communication signals to the powerline; and means for receiving said communication signals at a second location.

A system, device, and method of providing information for a power distribution system is provided. In one embodiment, a method of using a device that receives power from the low voltage power of the power distribution system and experiences a power loss during a local power outage may perform the processes of monitoring a voltage of the low voltage power line, detecting a voltage reduction below a threshold voltage for a predetermined time period, storing information of the voltage reduction in a non-volatile memory prior to the power outage, and transmitting a notification to a remote computer system prior to the outage. The monitoring may comprise making a plurality of measurements of the voltage during a time interval and averaging the plurality of voltage measurements. In addition, the method may include transmitting an alert message upon power up after the outage to indicate a power restoration local to the device.

An electric power line communication system operates with an electric power distribution system to provide through premises power distribution lines highly reliable communication links among power line communication devices electrically coupled or located in proximity to the premises power distribution lines. Each power line communication device associated with a set of premises power distribution lines has an identification address. A master code identifies the power line communication devices as members of a system domain of power line communication devices associated with the set of premises power distribution lines. Association of the master code with the identification addresses renders the member power line communication devices capable of operation without unintended communication with power line communication devices associated with a separate, different set of premises power distribution lines.

A power line communication-based aircraft power distribution system may allow for both power line communication (PLC) technology and spread spectrum time domain reflectometry (SSTDR) technology to be utilized in aircraft power distribution systems to achieve key maintenance functions. Unlike conventional power distribution systems, which may, for example, use only SSTDR for fault detection, the present invention includes a hardware platform that may allow both the PLC and the SSTDR to be utilized in aircraft power distribution systems to achieve key maintenance functions, such as real time wire fault location, and cost and weight savings. Further, unlike conventional power distribution systems, which may only detect and locate damage in feeder conductor wire sections before the power is applied to the load, the power distribution system of the present invention may permit real time wire fault location.

A method for exchanging data in a vehicle train having a tractor, at least one trailer coupled to the tractor, and vehicle electronics allocated to the tractor and trailer interconnected via a PLC data bus used to provide programmed input and output functions for the vehicle electronics of the trailer. Data representing the programmed functionality is provided automatically and cyclically via the PLC data bus to the vehicle electronics. The vehicle electronics can be configured as ABS control electronics, the programmed input and output functions providing functionality beyond that of the ABS function. Control of these additional functions in the trailer vehicle electronics equipped with the specific functionality is then exercised via an input / output unit provided in the tractor and connected to the PLC data bus either directly or indirectly via the tractor ABS control electronics.

The disclosure concerns a method and an apparatus for adapting at least one set of parameters to at least one Intelligent Electronic Device (IED) of an electrical power network having a plurality of switching devices (CB). The method includes: a) reading the current network status of the electrical power network, wherein the network status includes the status of the plurality of switching devices; b) simulating at least one network fault in the electrical power network; c) deducing at least one new set of parameters for the at least one IED using a simulated fault current induced by the at least one simulated network fault under consideration of the present network status and the network topology of the electrical power network; and d) setting the at least one set of parameters in at least one of the at least one IED. The apparatus a) reads the current network status of the electrical power network, b) selects the at least one set of parameters for the at least one Intelligent Electronic Device out of a plurality of sets of parameters depending of the current network status; and c) sets the at least one set of parameters in the at least one IED.

A system for detecting and reporting a defect in a telephone line includes a network of utility processors that communicate over a power line. Each utility processor monitors a telephone line connected to the processor. The utility processor includes a processing element, a line sensor, a telephone interface and a power line communication interface. Each utility processor reports a defect in the telephone line by sending message to a second utility processor via the power line. The second utility processor reports the defect to a central office via a telephone line.

A method and apparatus for communicating between an appliance and a power line carrier communication system includes at least one power line carrier connection, at least one appliance connection, and processing circuitry for translating between an appliance communication protocol and a power line carrier communication protocol. The method and apparatus allow bidirectional communication between power line carrier and apparatus.

A power line communication (PLC) method includes determining whether a destination communication apparatus to receive a data packet can directly communicate without using a repeater, transmitting the data packet to the destination communication apparatus when the destination communication apparatus can directly communicate without using the repeater, and transmitting the data packet to the repeater when the destination communication apparatus cannot directly communicate without using the repeater, and a power line communication (PLC) apparatus to perform the method.

PLC modems and a PLC communication system that includes the PLC modems receive a multicast packet from a video server of a multicast group. When a MAC address table is set therein, the PLC modems and the PLC communication system convert the multicast packet into a unicast packet and transmit the converted packet to a power line. When no MAC address is set, the PLC modems and the PLC communication system transmit the multicast packet to the power line.

Data communication between two devices (11, 12) over the public powerline network (13) uses a multi carrier technology wherein a communication channel is divided into a plurality of subchannels by frequency division multiplexing. A partial power as part of the total transmission power and a partial rate as a fraction of the total data rate are assigned to each subchannel as follows:Initially, the same partial power is assigned to each subchannel and the S / N ratio of each subchannel is obtained. Starting with the subchannel of the lowest S / N ratio and proceeding to that of the highest S / N ratio, the following steps are performed for each subchannel:Firstly, the partial rate is assigned in accordance with the respective S / N ratio such as to result in a predetermined transmission error rate. The assigned partial rate is then quantised to an integral value. If the quantising corresponds to a rounding down, the initially assigned partial power is reduced such that the transmission error rate remains the same as before quantisation. Further, the partial power of other subchannels with higher S / N ratio is increased such that the sum of all partial powers remains constant. Eventually, the increased S / N ratio resulting from increasing the partial power for these subchannels is calculated so that, when the present steps are conducted for them, an optimum partial rate can be assigned to them.This method maximises the total data rate of the entire communication channel while the error rate of each subchannel and the sum of all partial powers remain constant.

A system of intelligent appliances coupled by common household power lines or wireless links. One or more of the appliances serves as a system controller and may include a further communications interface for coupling to an external communications network, such as the telephone network. The system can thus be accessed and controlled remotely. The system can also communicate with and obtain information from remote sources such as Internet-based facilities.

A server system includes a common power bus, a power supply to provide direct current (DC) power through the common power bus, at least one node including a processor to receive the DC power through the common power bus, a transmitter capacitive coupled to the common power bus to transmit a power information signal from the power supply through the common power bus, and at least one receiver capacitive coupled to the common power bus to receive the power information signal transmitted by the transmitter and to provide the received power information signal to the at least one node. A plurality of buffers respectively coupled between the common power bus and each of the power supply and the at least one node provide path separation for high frequency and low frequency currents.

A short circuit detector for a fieldbus network which includes power / data wires that are typically positive and negative, respectively, and a shield conductor connected to a ground includes first and second high-impedance semiconductor circuits coupled between each of the leads and the shield conductors. Both circuits may either have a dedicated alarm indicator which indicates the presence of a short circuit between that conductor and the shield and / or may be coupled together to an alarm circuit which activates an alarm whenever a short circuit exists between either of the power / data leads and the shield conductor. The alarm circuit may have a ground which is isolated from the shield ground and may thus employ an isolation device such as an opto-isolator.

A method for transmitting a signal over a power line channel and a corresponding power line communication modem, wherein the signal is OFDM-modulated on a set of sub-carriers, the sub-carriers being separated by a frequency separation. The method includes receiving a noise signal via the power line channel, determining respective signal values of the received noise signal within a plurality of fine frequency bands with a first resolution bandwidth, wherein the first resolution bandwidth is smaller than the frequency separation, determining a first disturbed frequency band of the plurality of fine frequency bands based on the respective signal values, and notching the signal in the first disturbed frequency band before transmitting the signal.