Abstract: The present invention relates to a device and method for injecting a noise signal into a wire pair of a communication link. In operation a differential mode noise signal is received at a first and a second input port, which are connected via a first and a second resistor to a first and a second end tap of a primary coil of a transformer, respectively. The transformed differential mode noise signal is then transmitted via a first and a second end tap of a secondary coil of the transformer and a third and a fourth resistor to a first and a second output port for injection at high impedance into a first and a second wire of the communication link. Optionally, the device comprises a third input port connected to a center tap of the secondary coil for receiving a common mode noise signal. The common mode noise signal is then provided at low impedance to the first and the second wire via the first and the second end tap of the secondary coil and via the third and fourth resistor having low impedance, respectively.

Abstract: A high-speed receiver, adapted to receive signals over an input line in the presence of narrowband radio frequency interference (RFI). The receiver includes a RFI canceller module, which is coupled to receive samples of the interference from the input line. The module includes an adaptive bandpass filter, which is adapted to track a dominant frequency of the interference, and to generate a filtered output in a narrow frequency range centered on the dominant frequency. A corrector is coupled to receive the filtered output from the adaptive bandpass filter and to generate, responsive thereto, an estimate of the interference in the signals received by the receiver. A subtractor is adapted to subtract the estimate of the interference from the signals received by the receiver so as to generate a corrected output signal.

Abstract: Output driver for high speed Ethernet transceiver. A transmission line driver is disclosed for driving a transmission line in a first operating mode and in a second operating mode. The first and second operating modes operate substantially exclusive of each other. A current driver is provided for driving the transmission line in the first operating mode from a first data generator and at a first output voltage. A voltage driver is provided for driving the transmission line in the second operating mode from a second data generator at a second output voltage through a load, such that the current driver and the voltage driver operate independent of each other.

Abstract: An electrical isolation barrier for use in a Data Access Arrangement uses a high frequency (HF) transformer 24 to provide isolation. An input signal, which may be analog or digital, is connected to a modulator. The analog output of the modulator is connected to the input of the HF transformer. The output of the HF transformer is connected to the input of a demodulator. Simple amplitude modulation can be used in the modulator to modulate the input signal to the frequency range of operation of the HF transformer. A simple low pass filter may be incorporated in the demodulator to remove harmonic distortion caused by the HF transformer. The output signal of the demodulator is substantially the same as input signal.

Abstract: A current-limited low-impedance return path is provided between an isolated bus system and the primary supply that provides this isolated bus system. In a preferred embodiment, a voltage follower circuit with an input at ground potential supplies a controlled zero-voltage to a center-tap on the load side of an isolation transformer. This voltage follower circuit provides a low-impedance path for unbalanced communications signals, but is configured to present a high-impedance, or current-limited, path to short-circuit currents. In this manner, the commonmode voltage changes that are caused by parasitic currents between the primary supply and the isolated bus system are minimized by providing the low-impedance path for these currents, and the isolation is maintained by providing the high-impedance path for short-circuit currents.

Abstract: A portable receiver comprised of several antennas that are connected to a receiver unit for receiving a signal transmitted by an electromagnetic induction process. The antennas are made in the form of coils, that are carried by a support in such a way that the respective turns of the coils are oriented along different respective axes of an axis system associated with the support. The invention further includes a phase shifting means oriented between the antennas and the receiver unit. The phase shifting means is designed to produce a temporal phase shift corresponding to an angle of (n−1)&pgr;/n, at the frequency of the signal received between induced signals delivered by the antennas (n being the number of antennas).

Abstract: The present invention provides a mechanism for supporting high digital bandwidth in a multi-drop bus system. A first device of the system is electrically coupled to a bus. Multiple receiving devices are coupled to the bus through associated electromagnetic couplers having coupling coefficients in a specified range. The geometries of the electromagnetic couplers are selected to reduce variations in the coupling coefficients with changes in the relative positions of the coupler components.

Abstract: Devices consisting of a signal source and a signal sink connected by a transmission channel for transmitting high-frequency signals, as well as digital signals between moving parts. By eliminating wave reflections, the signals are transmitted such that reliable wide-band transmissions are ensured.

Abstract: A half-matching type transceiver circuit which only requires a reduced area for mounting. A coupling transformer has a primary winding with one end and the other end connected to balanced transmission lines, and a secondary winding with one end and the other end connected to output terminals of first and second tristate buffers, respectively. These tristate buffers are supplied at their respective input terminals with a high potential driving pulse signal corresponding to information data at shifted timings to generate a ternary transmission pulse signal on the balanced transmission lines.

Abstract: A method and related apparatus for high speed digital data conmunications from multiple distributed modems to a single central modem or a common transmission medium. In one embodiment, multiple downhole modems, with each modem associated with a geophone, transmit data to a surface modem over a single transmission medium. In a second embodiment, multiple transmission mediums are used and a plurality of downhole modems associated with geophones communicate to the surface modem over the downhole modem's respective transmission medium.

Abstract: The present invention, generally speaking, achieves a highly efficient line driver for high crest-factor signals such as DMT/ADSL signals. In an exemplary embodiment, a digital signal produced by a digital signal processor or the like is processed by a sigma-delta modulator to produce one or more binary signal pairs. The signals of a signal pair are low-pass filtered, if necessary, and applied across the winding of a transformer. The transformer has a single secondary winding connected to the line and may has as many primary windings as the number of signal pairs. The transformer may have a unity turns ratio or may have a turns ratio for accomplishing voltage step-up. For one signal pair, the number of possible resulting signals levels on the secondary side is three, for two signal pairs five, etc. Using more than two signal levels, it becomes possible to recreate from the digital signals the corresponding analog waveform with the required accuracy.

Abstract: What is described here is an array for the transmission of electrical energy or signals, respectively, between a base station and several external units adapted to be coupled, without contact, to various positions on said base station.

Abstract: A system and method are disclosed for transmitting data over multiple twisted pairs and receiving the data at a single receiver. In one embodiment, data is transmitted over an additional channel existing as the difference between the average voltages of two twisted pairs.

Abstract: An arrangement is provided for digital transmission of information via lines between a line termination (1) of a telecommunication network and subscribers (Tln) connected to the line termination. At least one terminal of a subscriber (Tln) is connected to a network termination (2) via an electric line (L3). The network termination (2) is connected to the line termination (1) via a line (L2) having metallic conductors. The line termination (1) has a voltage source (SV) for supplying power to itself and to the network termination (2) and the subscriber (Tln) terminals. For increased reliability during operation, two separate power supply units (SVE1, SVE2) are arranged in the network termination (2). One of the two separate power supply units (SVE1, SVE2) powers active components of the network termination (2) and the other of the two separate power supply units (SVE1, SVE2) powers the subscriber (Tln) terminals.

Abstract: A common mode termination includes a shielded connector, a receive section and a transmit section, each section comprising an isolation transformer, a common mode transformer, a reference autotransformer, and an AC shield return. Each transmit section reference autotransformer and receive section reference autotransformer has a center tap for the application of a bias voltage and a bias voltage return. The bias voltage is fed through a common mode transformer, and the resultant common mode termination reduces the conduction of EMI from the serdes coupled to the common mode termination to cables connected to the connector. This common mode termination also provides a reference termination for the copper twisted pair cable and reduces resonances on the cable. Finally, this termination also provides filtering on the DC power source wires and improves noise immunity from transients coupled onto the twisted pair cable into the system.

Abstract: A receiver with baseline wander correction for correcting a received input signal. The receiver includes first and second biasing resistor networks configured to receive first and a second signal of the received input signal, and to produce a first correction signal and a second correction signal. A comparator is employed to compare the first and the second correction signals in order to produce a control signal. The receiver also has comparison logic and compensation control circuitry. The comparison logic generates a logic signal according to the first and the second correction signals. Finally, the compensation control circuitry produces a compensation signal and provides it to respective output terminals of the first and the second biasing resistor networks so as to correct respective DC values of the first and the second correction signals.

Abstract: A communication. system includes two high speed communication links formed by pairs of transformers at either end thereof. A phantom circuit formed by the pairs of transformers is used to distribute power to devices connected to the high speed links. In transmission part of a communications system, data is transmitted under the control of a continuously variable frequency clock. Transmission is on parallel data-strobe links, and the receive includes circuitry to identify on which parallel the data signal is preset. A method and circuitry is provided for transmitting and receiving dc balanced data strobe signals.

Abstract: Improved control apparatus and methods transfer information between devices, such as controllers and field devices, utilizing a modulator that generates a pulse width modulated (PWM) signal containing information to be transferred by a first of the devices, e.g., the controller, to the second device. A transformer or other inductive device transfers the PWM signal across the isolation barrier, where it is demodulated to analog form for application to the second device, e.g., the field device. Information transferred from the second device to the first device can be transferred in an amplitude modulated (AM) signal that utilizes, as its carrier, a fixed duty cycle output of the modulator that generates the PWM signal.

Abstract: A pulse signal transmitting circuit generates a pulse signal having an enhanced high-frequency component with a reduced power loss. A pulse signal is transmitted to a load circuit through a transmission cable connected to a secondary winding of a transformer. First and second transistors are connected to a primary winding of the transformer. A voltage output from an external power source is input to the primary winding of the transformer when at least one of the first and second transistors is conductive so that a pulse voltage signal is input to the transformer. A booster power supply circuit is located between the external power source and a middle point of the primary winding of the transformer. The booster power supply circuit superimposes a boost voltage onto the voltage input to the primary winding of the transformer so that a high-frequency component of the pulse voltage signal input to the primary winding of the transformer is enhanced.

Abstract: A receiver for high-speed data communications, which receives a differential signal through a pair of signal lines. The receiver includes a common-mode choke, which has first and second signal windings, which are respectively coupled in series to the pair of signal lines so as to attenuate common-mode interference in the differential signal. The choke also has a sampling winding, which is inductively coupled to the signal windings so as to generate a sampled signal responsive to current flowing in the signal windings. Signal processing circuitry is coupled to receive the sampled signal from the sampling winding and to receive the differential signal from the signal windings and to process the differential signal responsive to the sampled signal.

Abstract: There is provided an apparatus for enabling communication of a data signal via a power transmission cable. The apparatus includes (a) a first winding for coupling the data signal via a conductor of the power transmission cable, and (b) a second winding, inductively coupled to the first winding, for coupling the data signal via a data port. The apparatus further includes the power transmission cable having a first neutral conductor and a second neutral conductor and apparatus for differential coupling of the data signal to the first and second neutral conductors.

Abstract: A line driver for coupling a data transceiver to a line, including a first amplifier having a first input and a second input and a first output coupled to a first side of the line, the first input being coupled to a first input terminal. The driver includes a second amplifier having a third input and a fourth input and a second output coupled to a second side of the line, the third input being coupled to a second input terminal. The driver further includes a first voltage feedback resistor, having a first voltage feedback resistance, connected between the first output and the second input, and a second voltage feedback resistor, having a resistance substantially equal to the first voltage feedback resistance, connected between the second output and the fourth input.

Abstract: Improved data communication for modems having digital identification information capability.

Abstract: An interface method and system for interfacing a DC unbalanced databus with a DC balanced databus suited for use in an aircraft. The system includes a DC unbalanced databus and a controller coupled to the DC unbalanced databus. An alternating DC unbalanced voltage differential signal is transmittable from the controller to a first transformer which is coupled to the controller. The alternating DC unbalanced voltage differential signal may be stepped-up and DC balanced by the first transformer to create a DC balanced voltage differential signal. A transmitter is coupled to the first transformer, where the transmitter comprises a high power differential voltage driver. The DC balanced voltage differential signal may be stepped up by the transmitter to a high drive current signal. A second transformer is coupled to the transmitter, and at least one DC balanced databus is coupled to the second transformer. A waveform shaping network may be coupled between the second transformer and DC balanced databus.

Abstract: A circuit for correcting baseline wander in a transmitter which includes a main signal current driver driving a first winding of a two-winding transformer which first winding is in parallel with a termination impedance matching load, in which a compensation current driver is coupled in parallel with the main signal current driver for adding its current to current of the main signal current driver. A correction signal control input is provided to the compensation driver. A sample-and-hold circuit is connected across the first winding, an error amplifier having a first pair of inputs is connected across the first winding and a second pair of inputs are connected to the output of the sample and hold circuit. These provide an error signal resulting from a difference of signals appearing at its respective pairs of inputs.

Abstract: A line interface apparatus includes a line coupling transformer having first and second windings, and an impedance matching circuit connected to the first winding. The impedance matching circuit includes a first section characterized by a first impedance, a second section characterized by a second impedance, and a switch circuit, connected to the first and second sections and to the first winding of the line coupling transformer, for switching either the first or the second section in series with the first winding of the line coupling transformer. An echo of a transmitted signal is replicated and subtracted from a composite signal comprising a received signal and the echo of the transmitted signal. The result of the subtraction is compared to a threshold value to indicate whether a loop connected to the second winding of the line coupling transformer has an impedance about equal to a first impedance or about equal to a second impedance.

Abstract: A method of estimating the channel impulse response (CIR) of a communication system is disclosed. The method comprises providing a first estimation of the CIR by an impulse response calculation, using correlation of signals to determine tap weights for the calculation, thereby providing a set of amplitude values within equally time spaced bins. The true path delay of a radio channel represented by the significant peaks in the first estimation is determined, by reference to amplitude values of those of the bins which surround the bin having the greatest amplitude. A refined estimation of the CIR is calculated using the significant peaks, such that these peaks represent substantially all the energy represented by the first estimation of CIR.

Abstract: A network allowing for communication, sensing and control, comprising at least three nodes interconnected by a bus for conveying both power and data. The bus includes at least two power carrying conductors, which may be used to convey the data together with the power, and across which at least two power supplies are connected via respective source couplers at different points thereof Preferably, there are connected to the nodes one or more payloads that may be powered by local power supplies so as to provide greater fault-protection and flexibility.

Abstract: An isolation system is provided that is suitable for use in telephony, medical instrumentation, industrial process control and other applications. Preferred embodiments of the invention comprise a capacitive isolation barrier across which a digital signal is communicated. The system provides a means of communication across the isolation barrier that is highly immune to amplitude and phase noise interference. Clock recovery circuitry may be employed on one side of the isolation barrier to extract timing information from the digital signal communicated across the barrier, and to filter the effects of phase noise introduced at the barrier. Delta-sigma converters may be disposed on both sides of the isolation barrier to convert signals between analog and digital domains. An isolated power supply may also be provided on the isolated side of the barrier, whereby direct current is generated in response to the digital data received across the isolation barrier.

Abstract: A method and an apparatus providing high level signals by summing partial signal currents and magnetomotive forces. In one embodiment, an isolation transformer having a 1:1 turns ratio and a plurality of separate primary windings is utilized. A plurality of independently controlled current generators are coupled to each separate primary winding with appropriate terminations such that the data communications circuit is impedance matched across the entire system. The isolation transformer sums the partial currents and magnetomotive forces in each separate primary winding such that a higher level high quality signal is produced in the secondary winding. As such, high quality high level data communications signals are produced with the described data communications circuit from low voltage level signals.

Abstract: A non-propagating magnetic field-based communication system transmits and receives digital data within a limited coverage area environment. The system includes a compact transmitter unit, such as that contained in an ‘tracking’ tag affixed to an object, and a digital detector/demodulator unit. In order to generate and FSK-modulate a non-propagating magnetic field in accordance with modulation signals representative of the digital data, the transmitter unit contains a magnetic field coil and one or more capacitors controllably switched in circuit with the coil in accordance with the data, so as to change the resonant frequency of an inductor-capacitor transmitter resonant circuit. The receiver unit includes a magnetic field-sensing coil in circuit with a capacitor, to form a receiver resonant circuit that resonates at a frequency between the FSK frequencies modulated by the transmitter unit.

Abstract: Systems and methods are described for asymmetric digital subscriber loops.

Abstract: A bidirectional communications interface employs the same path for transmitting and receiving. The bidirectional communications interface includes one two winding transformer for both transmit and receive and an integrated circuit having a transmitter and a receiver each connected to the same pair of input/output pins. The interface enables a communications node in a communications network to transmit data to and receive data from other nodes in the network.

Abstract: The present invention relates to a method and apparatus for separating a low frequency voice signal from a high frequency data signal propagating on an analog loop connecting the central office of the PSTN to a CPE. The apparatus includes a low pass filter connected in series with the tip and ring conductors of the analog loop to extract the voice signal. The apparatus also includes a high pass filter to reject the low frequency voice signal, leaving only the higher frequency components. The high pass filter features a transformer including two balanced primary winding sections, one section being in series with the tip conductor and one section being in series with the ring conductor. A junction circuit is coupled to the high pass filter to provide the signal exchange functionality needed to separate the transmit and receive components of the high speed data signal.

Abstract: An Apparatus for extracting communications signals from power lines, which lines are arranged such that leakage of signals occurs between them. The apparatus receives a signal from each of at least two of lines (blue, red, yellow) and combines the received signals so as to increase the ratio of wanted signal to interference plus noise S/(1+N). Preferably the combining is achieved by weights WB, WR, WY and a summer. The weights phase shift and scale the received signals in amplitude. The apparatus can also be used for transmitting in the downstream direction.

Abstract: A system and method for constructing a resistance integrated coupler adapted to be coupled between a data bus and a terminal device. The system and method includes the steps of calculating a desired resistance of a set of data-bus windings, wherein the desired resistance is substantially (1.5×Zo), wherein Zo is a selected data bus cable nominal characteristic impedance; winding the set of data-bus windings to form a first part of the resistance integrated coupler using a specified amount of high resistance wire, the specified amount of high resistance wire having a total resistance substantially equal to the calculated desired resistance; and winding a set of terminal device windings to form a second part of the resistance integrated coupler. The resistance integrated coupler is constructed substantially in accordance with the guidelines of MIL-STD-1553B.

Abstract: An Ethernet device power transmission system includes an input transformer, an output transformer and a pair of twisted pair conductors. The input transformer includes a pair of primaries for connection to a source of Ethernet data. The input transformer also includes a pair of secondaries, each having a center-tap. A first twisted pair conductor is connected across the first secondary, a second twisted pair conductor is connected across the second secondary and a DC-bias is provided between the respective center taps of the first and second secondaries. At the local end, the output transformer includes a first and second center-tapped primary and a first and second secondary for connection to the load device. The first and second primary center taps are connected to a power processor for extraction of DC power.

Abstract: The present invention, generally speaking, achieves a highly efficient line driver for high crest-factor signals such as DMT/ADSL signals. In an exemplary embodiment, a digital signal produced by a digital signal processor or the like is processed by a sigma-delta modulator (SDM) to produce one or more binary signal pairs. The signals of a signal pair are low-pass filtered, if necessary, and applied across the winding of a transformer. The transformer has a single secondary winding connected to the line and may has as many primary windings as the number of signal pairs. The transformer may have a unity turns ratio or may have a turns ratio for accomplishing voltage step-up. For one signal pair, the number of possible resulting signals levels on the secondary side is three, for two signal pairs five, etc. Using more than two signal levels, it becomes possible to recreate from the digital signals the corresponding analog waveform with the required accuracy.

Abstract: An interface circuit (100) and method for interfacing digital signals with a bus, comprising: means (TxduC) for receiving digital signals, for transmission on the bus, relative to a first ground potential; transformer means (106) for passing edges of the received digital signals; and reconstruction means (110) for reconstructing signals from the edges of signals passed by the transformer means, so as to produce digital signals, for transmission on the bus, relative to a second ground potential. A similar circuit (CANL, 130, 134) interfaces, from the second ground potential to the first ground potential, signals received from the bus. The reconstruction means may use Schmitt triggers, whose bias points may be set by oscillators incorporating further Schmitt triggers (120, 142) located on the same semiconductor die to reduce temperature variability.

Abstract: A digital data transmitting apparatus includes a first information terminal placed on a first block. The first information terminal supplies serial data to a first adapter thereof through a corresponding output end. The first adapter transmits the data by electromagnetic coupling to a first transceiver placed on the first block. The data is transmitted from the first transceiver to a second transceiver placed on a second block through a switch. The second transceiver is connected to a second adapter of a second information terminal placed on the second block by electromagnetic coupling. As a result, the data is transmitted from the first information terminal to the second information terminal using a closed channel.

Abstract: An improved line interface device and an improved xDSL modem for use in connecting data communications equipment to a xDSL line is disclosed. The line interface device provides the required isolation between the xDSL line and the communications equipment using optical isolation or capacitive techniques, as well as provides the power necessary to produce the transmit signal levels required by the communications services by utilizing a switching power supply deriving its power from a source isolated from the line, and including a transformer for isolating the source from the xDSL line. By switching at high frequencies the size of the transformer can be sufficiently small so that the interface device and supply can be provided in accordance with small form factor requirements.

Abstract: A clock distribution apparatus with active phase alignment which makes the incidence of a timing event occur essentially simultaneously at multiple physically remote destinations. The circuit uses traces configured as reflective transmission lines with a matched impedance input. The propagation time of a transmission line is determined by monitoring the current into the transmission line. Variable delays are determined for each transmission line by measuring the actual propagation time and reducing a predetermined maximum delay time by that amount. The variable delay values are stored and used to retard clock edges by the varying amounts so that all clock edges arrive at respective remote destinations at a time equal to the maximum delay time.

Abstract: A single chip dual function 10 Base-T/100 Base-X physical layer interface device (PHY) compatible with existing 5 V parts is provided. The PHY includes a media-independent interface (MII) and connects to an unshielded twisted pair cable via an isolation transformer and a single RJ45 connector. The PHY includes built-in auto-negotiation circuitry that allows for automatic selection of half/full duplex 10 Base-T and 100 Base-TX, while auto-polarity correction circuitry ensures immunity to receive pair reversal in the 10 Base-T mode of operation. The PHY includes internal PLL circuitry that uses a single 20 MHz clock or crystal, but that is suitable for either speed mode. The PHY includes low-power and power down modes. The 10 Base-T portions of the PHY include smart squelch for improved receive noise immunity. The PHY includes high jitter tolerance clock recovery circuitry and transmit jabber detection circuitry. The 10 Base-T portions of the PHY include on board transmit waveshaping.

Abstract: A media converter for conversion between electrical signals and fiber optical signals includes an optical signal receiver circuit with a converter to change the optical signal into an analog electrical signal, a quantizer for converting the analog electrical signal into digital format, and an encoder for converting the signals from the quantizer into coding for wire transmission. A transformer isolates the receiver circuit from the media interface which is coupled to wire and optical cables. An optical signal transmission circuit includes a receiver for receiving the signals from metallic cable, a transformer for isolation of the transmission circuit, a decoder for converting the wire cable signals into a format for operation of an LED driver, an LED driver, an LED for producing digital light pulses, and an optical fiber interface for receiving the light pulses. The wavelength is preferably about 850 nanometers, but may also be about 1300 nanometers.

Abstract: A line driver circuit capable of operating in 100Base-T mode and 10Base-T mode includes a 1:1 transformer having a primary winding, the primary winding having a center tap. A current source couples to the center tap. A current steering circuit steers drive current from the current source in first and second directions to provide a differential output signal at the output nodes. The current steering circuit includes two switches. Input signals control the opening and closing of the switches such that the switches are never both open at the same time. Thus, during a time period, one switch closes to pull one output node up toward the supply voltage, while the other switch opens to pull the other output node down toward circuit ground. Since the current source couples to the center tap of the transformer, the current source is only pulled down to a voltage half that of the supply voltage rather than to circuit ground. Therefore, the current source has sufficient headroom to drive the output current.

Abstract: A data transmission circuit having a station and a response circuit. The station has an amplitude demodulator as well as a primary coil with a signal generator for producing an alternating magnetic field at a carrier frequency. The response circuit has a secondary coil as well as an amplitude modulator for influencing a load on the secondary coil, and the amplitude modulator is configured such that the alternating magnetic field can be modulated with a data signal. Particularly when the data transmission circuit is mass-produced, situations frequently occur in which the data signal modulated onto the alternating magnetic field by the response circuit can no longer be reconstructed at the station end. The object of the invention is thus to provide a data transmission circuit of this generic type, which always operates reliably. According to the invention, the response circuit has a phase modulator for influencing the electrical characteristics of the secondary coil.

Abstract: A broadband modem hybrid transformer couples a broadband modem to a plain-old-telephone (POTs) line. The hybrid includes a full bridge having an impedance matching network to reduce the transhybrid attenuation of the hybrid. The second matching network(s) include various resistive and reactive components which together provide an impedance value selected based upon the impedance of the telephone line typically reflected into the primary windings of the transformer. The matching network increases the transhybrid attenuation of the hybrid, and thus reducing the amount of noise which couples from the modem transmit circuit to the modem receive circuit through the hybrid.

Abstract: A communication system includes two high speed communication links formed by pairs of transformers at either end thereof. A phantom circuit formed by the pairs of transformers is used to distribute power to devices connected to the high speed links. In transmission part of a communications system, data is transmitted under the control of a continuously variable frequency clock. Transmission is on parallel data-strobe links, and the receive includes circuitry to identify on which parallel the data signal is preset. A method and circuitry is provided for transmitting and receiving dc balanced data strobe signals.

Abstract: An Ethernet device power transmission system includes an input transformer, an output transformer and a pair of twisted pair conductors. The input transformer includes a pair of primaries for connection to a source of Ethernet data. The input transformer also includes a pair of secondaries, each having a center-tap. A first twisted pair conductor is connected across the first secondary, a second twisted pair conductor is connected across the second secondary and a DC-bias is provided between the respective center taps of the first and second secondaries. At the local end, the output transformer includes a first and second center-tapped primary and a first and second secondary for connection to the load device. The first and second primary center taps are connected to a power processor for extraction of DC power.

Abstract: In the case of a process for the wireless transmission of energy and data between two parts, preferably the steering wheel and the steering column of a vehicle, having a transformer-type transmitter and consisting of a primary and secondary winding assigned to the parts, and a rectangular carrier frequency on the primary side, the data transmission is carried out in one direction by the modulation of the carrier signal and in the other direction outside the switching flanks of the carrier signal.