228results about "Fixed station two-conductor transmission systems" patented technology

Power is supplied to telecom equipment in DSLAM outdoor / remote cabinets with relatively short distances between the subscriber and the cabinet. All of the subscriber Customer Premises Equipment connected to the DSLAM each provide a portion of the required power to the remote cabinet via the telephone line connecting the DSLAM and the subscriber CPE. The CPE at the subscriber premises is already connected to power mains in the subscriber premises so, providing power, via the telephone line to the outdoor cabinet is relatively simple. The remote cabinet includes a circuit for receiving the power input from each subscriber and then distributing the power, required by the DSLAM load, equally among the subscribers.

An amplitude detector incorporated in an electronic device with a serial ATA interface detects the amplitude of a serial data signal input to an I / O circuit via a SATA bus. An averaging unit averages the detection results of the amplitude detector. A comparator compares the resultant average with an expected input signal amplitude. Based on the comparison result, an amplitude adjuster adjusts the amplitude of a serial data signal when this signal is output from the I / O circuit. Adjustment is performed such that when the serial data signal output from the I / O circuit is input to another electronic device via the SATA bus, it has an amplitude at least approximately equal to the expected input signal amplitude. In other embodiments, the invention utilizes an amplitude detector, comparator and adjuster and employs a step-by-step adjustment of the electronic device with another similarly equipped electronic device.

One aspect of the present invention is directed to a circuit that includes an amplifier circuit disposed between an isolation link and a Schmitt trigger circuit to amplify a differential signal communicated over the isolation link and supply the amplified signal to the Schmitt trigger circuit. In turn, the Schmitt trigger circuit is coupled to the amplifier circuit to receive the differential signal and to supply a differential output signal corresponding to the differential signal communicated over the isolation link.

A data transfer apparatus is composed of a transmitter (10) and a receiver (20). The transmitter (10) includes an output buffer developing a differential signal in response to a data signal (11a), and an amplitude controller (12). The receiver (20) includes an input buffer (21) converting the differential signal into a single-end signal (21a), and an amplitude detector (22) developing a feedback signal in response to the single-end signal (21a). The amplitude controller (12) controls an amplitude of the differential signal in response to the feedback signal.

A fueling environment communication system for providing high bandwidth information via existing field wiring to a plurality of forecourt devices. The communication system according to this aspect comprises a back room communication module having a first plurality of Ethernet ports for connection to external devices using Ethernet communication and a second plurality of Ethernet ports. The back room communication module further comprises a plurality of modulation interface devices each connected on a first side to a respective one of the second plurality of Ethernet ports. A summing and isolation module having a high pass filter is connected to each of the modulation interface devices on a second side thereof to pass a modulated high frequency signal. The summing and isolation module further has a low pass filter through which low frequency legacy data can be passed and combined with said modulated high frequency signal. In addition, summing and isolation module is connectable via existing field wiring to communicate with forecourt devices in point-to-point fashion.

A differential signaling system where a first wire and a second wire are connected to a sending end and a receiving end of a differential signal line. A termination resistor is connected between the first wire and the second wire adjacent to the receiving end. A programmable compensation circuit is connected to the termination resistor in parallel. The programmable compensation circuit includes: a plurality of switches for receiving each bit of an input digital control signal through a gate thereof; a plurality of first capacitors including a first electrode connected to a source electrode of each of the switches, and a second electrode connected to the first wire; and a plurality of second capacitors including a first electrode connected to a drain electrode of each of the switches, and a second electrode connected to the second wire.

A method of communication over a composite cable having a plurality of conductors, the method including placing an inductive coupler around the composite cable, coupling the composite cable to a signal input or output using the inductive coupler around the composite cable to communicate a signal to or from the composite cable, wherein the signal is communicated across the composite cable from a first location to a second location, wherein the inductive coupler is at one of the first location and the second location.

A subsea data communication system and a method of performing a data communication between a topside control system and a subsea installation are provided. The topside control system includes a topside low frequency modem adapted to perform a data communication in a first frequency range, and the subsea installation includes a subsea low frequency modem adapted to perform a data communication in the first frequency range. The topside low frequency modem is coupled to a subsea low frequency modem by a data transmission line of an umbilical that connects the topside control system to the subsea installation.

A differential signaling system, wherein a first wiring and a second wiring are coupled between a sending end and a receiving end as a differential signal line. A termination resistor is coupled between the first wiring and the second wiring in the receiving end side. A test circuit is coupled to the termination resistor in parallel, and amplifies and detects a variation of a differential impedance due to the differential signal line. The test circuit includes: a differential test amplifier for amplifying a variation in the differential impedance of the first wiring or the second wiring; a switching unit installed at an input terminal of the differential test amplifier for controlling an operation of the differential test amplifier; and a peak detector for converting an output signal of the differential test amplifier into a direct current component; and a phase detector for detecting a skew, a time delay, and / or a phase difference of a signal inputted to the differential signal line.

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.

A system and method of transmitting and receiving bit serial information is disclosed. In a differential embodiment, serial bits are transmitted by a pair of line-matched differential drivers that are ac coupled to a two-conductor transmission line. A receiver is ac coupled to the line and receives the transmitted serial information via a high pass filter. The receiver includes a level-triggered latch that provides a threshold for receiving the serial information, changes state to reflect the received information, and then clamps the received information to the state of the latch. In a single-ended embodiment, the ac-coupled receiver receives the bit serial information via a high pass filter. The resistance for the filter is an active device that also provides a voltage threshold for the receiver. The received bit serial information changes the state of a device which then alters the threshold, via hysteresis, for the net bit of serial information.

The invention is a method of communicating between kernel processor and microengine in a network processor, setting annular queue and shared memory between them, directly placing messages transmitted between them in the transmit-receive annular queue, and it includes the flows: the microengine transmits messages to the kernel processor for processing and the kernel processor transmits messages to the microengine for processing. Compared with existing techniques, the microengine communicates with ARM by using the annular queue, which can make ARM communication task operating queue avoid adopting locking mechanism, accordingly avoiding the reduction of processing performance of the microengine. At the same time, it can extremely enhance processing performance of network processor, so as to complete data processing and transmission at limited speed, playing a great role in increasing throughput and processing speed of system.

VoIP-based telephone is provided with integral paging amplifier and a WiFi antenna, and is designed for hazardous areas such as UL Class I, Division 1, Division 2 and IEC Ex including the WiFi antenna. A system of VoIP-based telephone units supports multicast to provide prioritized and loudspeaker-zoned paging. The integral 30-watt class D amplifier in the telephone units provides sufficient volume for paging and ringing to be reliably detected by personnel in hazardous locations. Upon lifting the handset, the telephone unit can automatically revert to standard VoIP telephone operation. The telephones can be powered via DC, AC or with Power over Ethernet (POE).

A technique to provide distributed wireless extenders over a MoCA specified coaxial cable backbone, in which the extenders function as wireless connection points on a network. The wireless extenders operate with a central access point controller that functions as the access point for the network, in which the extenders provide a plurality of wireless connection points for devices attempting to access the network. In one scheme, the MoCA backbone is used to transfer multimedia data using protocols such as LWAPP and CAPWAP.

With the current initialization procedures defined in the VDSL and ADSL standards, even though the xDSL system could operate in Showtime in an impulse noise environment where symbols are being corrupted, the transceivers would not be able to reach Showtime because initialization would fail due to initialization message failure. Through the use of an improved initialization procedure for communication systems, operation in environments with higher levels of impulse noise is possible.

A differential signaling system, wherein a first wiring and a second wiring are coupled between a sending end and a receiving end as a differential signal line. A termination resistor is coupled between the first wiring and the second wiring in the receiving end side. A test circuit is coupled to the termination resistor in parallel, and amplifies and detects a variation of a differential impedance due to the differential signal line. The test circuit includes: a differential test amplifier for amplifying a variation in the differential impedance of the first wiring or the second wiring; a switching unit installed at an input terminal of the differential test amplifier for controlling an operation of the differential test amplifier; and a peak detector for converting an output signal of the differential test amplifier into a direct current component.

The invention relates to a kind of data gathering system based on CAN bus. It consist of the first meter layer which includes sensor and transactor, the secondary meter layer and the data recording&displaying layer. The trait is all the secondary meter in the secondary meter layer is intelligent meter installed unified CAN communication interface which form the intelligent meter CAN nodes layer. The data recording&displaying layer above is just the data gathering / controlling layer. It all installed with CAN communication interface which make the bus configuring / data gathering / controlling layer. The bus configuring / data gathering / controlling layer communicate through the CAN bus with the intelligent meter CAN nodes layer and within all other layer. The data of the first meter layer is transformed by the intelligent second meter layer into CAN bus linear data and send to the upper terminal of the bus configuring / data gathering / controlling layer. The whole process is highly anti-jamming with unified standard interface and extendable to suit different needs in different test. The data gathering and controlling system could be connected to and exchange data with other experimental device on the car or on the lab table.

An electronic device designed to transport digital information (“0”, “1”) over long distances, including a transmitter generating current pulses and at least one assembly of receivers converting the received current pulses into logic pulses which are compatible with the operation of standard electronic logic circuits. Each receiver includes a pair of magnetoresistive stacks containing at least one hard ferromagnetic layer and one soft ferromagnetic layer separated by a non-ferromagnetic interlayer, the hard layer of each of the magnetoresistive stacks being pinned in a magnetic orientation perpendicular to an easy-magnetization axis which is used as a reference for the soft layer of the same stack. The soft layer of each magnetoresistive stack has a magnetic orientation which can be modulated by the magnetic field generated by current pulses delivered by the transmitter so as to cause modification of the transverse resistance of the stack sufficient to trigger an electrical signal.

A parent station output section changes a duty factor between a period in which a control data signal is at a level (high-potential low-level) lower than a power supply voltage Vx but higher than high-level signal in other circuit portions and a subsequent period in which the control data signal is at the power supply voltage Vx level to convert the control data signal into a serial pulse voltage signal and output the voltage signal onto data signal lines D+ and D− in accordance with each data value in the control data signal inputted from a controller in each cycle of a clock.

A method and apparatus for detecting the presence and the type of network devices connected to a management device via transmission lines. The apparatus may include a pull-up resistor, a pull-down resistor, a filter, and a presence detector, the resistors superimposing a DC or low-frequency voltage on the transmission line. The impact, if any, of the DC voltage one communications equipment and circuitry can be reduced by a coupling that isolates the DC voltage. Similarly, the filter prevents transmitted data signals from interfering with the DC voltage level. The method and apparatus function regardless of whether the network device is functional or powered on, and different values of pull-up or pull-down resistors can be used to indicate the type of device that terminates the transmission line.

A novel technique for transferring power, measurement signals, and communication signals between two electrical devices over a single wire pair is presented. A host device supplies power to a sensor device over the wire pair. The sensor device obtains A / C signals by modulating the current component of the power signal on the wire pair. The host device de-modulates the current component of the power signal on the wire pair to recover the A / C measurement signals. The sensor device generates a serial bit stream containing sensor communication signals, and modulates it with either the voltage-or current-component of the power signal present on the wire pair. The host device appropriately de-modulates the power signal to recover the serial bit stream containing the sensor communication signals.

The disclosed electromagnetic wave transmission medium prevents electromagnetic leakage during high-power electromagnetic wave transmission. The sheet-form electromagnetic wave transmission medium is configured from a first mesh conductor used in transmission of electromagnetic waves having a first power; and a second mesh conductor used in transmission of electromagnetic waves having a second power. By using two mesh conductors, when said sheet-form electromagnetic wave transmission medium is used, the conduction density of the surface region where electromagnetic waves are extracted to be used for power supply assumes a coarser state than that of the other surface region.

A data transfer apparatus is composed of a transmitter and a receiver. The transmitter includes an output buffer developing a differential signal in response to a data signal, and an amplitude controller. The receiver includes an input buffer converting the differential signal into a single-end signal, and an amplitude detector developing a feedback signal in response to the single-end signal. The amplitude controller controls an amplitude of the differential signal in response to the feedback signal.

A multi-channel video intercom system 600 with access to advanced digital services which comprises a two-wire communication bus 659 disposed such as to allow audio, video and data communications in different communication channels, at least one outdoor panel 630 having a camera connected to said communication bus 650, at least one power supply 640 connected to said communication bus 650 disposed to provide power to the rest of the video intercom system 600, at least one user terminal 300 connected to said communication bus 650 wherein said at least one terminal 300 is connected to the at least one outdoor panel 630 and wherein the at least one terminal 300 is a video intercom terminal 310. As opposed to the known systems, the system of the invention characteristically comprises 600 a communications gateway 100 connected to said communication bus 650 through a first connection interface and with Internet connected 700a through a second connection interface wherein said gateway 100 is disposed such as to allow access to advanced digital services accessible via the Internet 700 from the at least one video intercom terminal 310 through at least one communication bus 650 channel when said at least one channel is available for data.

A transmission line matable to a differential signal source, includes a first connector having a impedor and a first differential terminal pair, a second connector having a conversion module and a second differential terminal pair, and a wire electrically connected to the first and the second connectors. A differential signal received by the first differential terminal pair of the first connector at one end of the transmission line is processed by the impedor and then is converted into a single-ended signal transmitted on the wire. Then the conversion module restores the single-ended signal to the differential signal, and the differential signal is output from the second differential terminal pair of the second connector at the other end of the transmission line.

A method, a related system, and recordable media adapted to store the method. The method controlling transmission frequency for first and second transmission signals exchanged between a host and an attached device using a serial advanced technology attachment (SATA) technology by detecting a first transmission frequency from a received first transmission signal, and controlling a second transmission frequency for a second transmission signal in relation to the detected first transmission frequency.

Digital video data is transmitted from a video source (61) to a video sink (62) as a group of three multilevel symbols (611, 612, and 613) per pixel color with each associated symbol being sent at a rate of three times the pixel clock (601). When eleven levels are used per symbol (611) and undesirable symbol groups having excess DC residual or minimal energy are eliminated, and a built-in-test symbol group is added for pixel alignment; there results a one-to-one correspondence between the remaining symbol groups available and the two-hundred and sixty possible states that are used in the TMDS physical layer that is in widespread commercial use.