Abstract: A circuit for the analog correlation of a signal to remove impairments such as echo, cross talk and intersymbol interference is described. A duplexing circuit which improves echo response by providing a second transformer is described.

Abstract: A method and apparatus for a Gigabit Ethernet transceiver that has a Class-B amplifier in a main transmitter for higher efficiency and power handling capabilities. The output current of the main transmitter is produced by a reference voltage applied across a resistor, where the reference voltage generator, resistor and amplifier are fabricated on the same substrate, such that the output current is constant across process voltage and temperature. The transceiver also has a replica transmitter whose signal is used to cancel the main transmitter signal at the input of the receiver section of the transceiver. The replica transmitter is fabricated on the same substrate as the main transmitter, such that its output signal reflects non-linearities in the main transmitter across process voltage and temperature.

Abstract: Systems and methods are disclosed for a full duplex wideband communications system for a local (e.g., in-home) coaxial network. The system employs a Frequency-division duplex (FDD) scheme that allows identical wideband modems to communicate with each other. To achieve this, the wideband modems contain a duplexer and a switch that allows reversing the connection of the wideband transmitter and receiver to the duplexer. Each wideband modem includes a control modem that is used to control access to the wideband channels. A wideband transmitter, which may be included in a modem associated with a server set-top terminal (STT), transmits a video presentation to a wideband receiver, which may be included in a modem associated with a client STT.

Abstract: A receive or listen only Physical Interface Device (Phy). The receive or listen only Phy is configured to have a front end configured to only receive data from a communications network. The receive only Phy may be implemented a part of a tap device including a first network port for receiving a first network signal having a first format; a receive only Phy for converting the first network signal into a second signal format; and a transmit and receive Phy for receiving the first network signal in the second signal format and converting it into the first signal format.

Abstract: The principles of the present invention relate to passive full-duplex bidirectional Zero Packet Loss (ZPL) network taps that include single, dual, or dual differential couplers that are placed in the communication path between two network devices that communicate using a full-duplex bidirectional data stream that include a first and a second data component. The bidirectional couplers are configured to at least partially obtain a second data stream that includes at least the first data component and to obtain a third data stream that includes at least the second data component. In some embodiments, the bidirectional couplers may include a signal separation module or stage that is configured to further separate the first and second data components.

Abstract: Providing VOIP barge-in support for a half-duplex DSR client on a full-duplex network by buffering, in a half-duplex DSR client, input audio from the full-duplex network; playing, through the half-duplex DSR client, the buffered input audio; pausing, during voice activity on the half-duplex DSR client, the playing of the buffered input audio; sending, during voice activity on the half-duplex DSR client, speech for recognition through the full-duplex network to a voice server; receiving in the half-duplex DSR client through the full-duplex network from the voice server notification of speech recognition, the notification bearing a time stamp; and, responsive to receiving the notification, resuming the playing of the buffered input audio, including playing only buffered VOIP audio data bearing time stamps later than the time stamp of the recognition notification.

Abstract: In one embodiment, a method includes sending upstream to a nearest neighbor node, by a Client Label Switched Router (LSR), a downstream label map message of a Server-Forwarding Equivalence Class type (S-FEC-DOWN). In response to the S-FEC-DOWN, a downstream forwarding state from the nearest neighbor node to the Client LSR is established. An upstream label map message of a Client-Forwarding Equivalence Class type (C-FEC UP) is received from the nearest neighbor node. An upstream forwarding state corresponding to the C-FEC UP is then established by the Client LSR.

Abstract: The inventive communication device for converting a baseband data signal to a baseband signal for a coaxial cable, comprises at least one first input terminal for receiving an incoming baseband data signal, at least a first output terminal for outputting an outgoing baseband data signal, a first input/output terminal for connecting to a coaxial cable for communication of a duplex signal, first rebalancing means for converting said incoming baseband data signal to a balanced input signal, subtraction means for subtracting the balanced input signal from the duplex signal to obtain a balanced output signal, second rebalancing means for converting the balanced output signal to said outgoing baseband data signal.

Abstract: The present invention extends to methods, systems, and computer program products for multiplexed communication for duplex applications. Embodiments of the invention facilitate a multiplexed variant of long polling over a request/reply communication medium that (potentially significantly) reduces the resources utilized when exchanging messages. The lightweight address generation mechanism facilitates polling and routing for a pool of many clients and many services while minimizing allocated resources to each established session. Further, the benefits of a lower latency bidirectional communication medium between clients and services can be utilized.

Abstract: Certain aspects of the present disclosure relate to a method for synchronous multi-channel transmissions in wireless local area networks.

Abstract: To improve the performance of DSL modems, a DSL duplexing ratio for a new communication is selected according to the communications needs of an application. A required upstream and downstream bit rate for application communications is determined. From the ratio of these bit rates, a desired duplexing ratio is calculated. The operation of the modem is then adapted to choose a duplexing ratio that approximates the desired duplexing ratio for the application. To optimize modem operation, the size and position of the upstream and downstream bandwidths used for transmission are intelligently selected when the bit rate necessary for making the transmission is less than the total available bandwidth provided by the chosen duplexing ratio. By intelligently selecting a minimum number of subcarriers for Digital Multi-tone (DMT) signal transmission, a reduction in line driver power consumption is effectuated.

Abstract: A data capture technique for high speed signaling to allow for optimal sampling of an asynchronous data stream. This technique allows for extremely high data rates and does not require that a clock be sent with the data as is done in source synchronous systems. The present invention also provides a hardware mechanism for automatically adjusting transmission delays for optimal two-bit simultaneous bi-directional (SiBiDi) signaling.

Abstract: A method and apparatus for providing downlink transmit delay diversity (TDD). In accordance with the invention, a BTS includes at least one simplex transceiver (S-TRX) that does not implement downlink TDD and at least one duplex transceiver (D-TRX) that does implement TDD. In accordance with the preferred embodiment, the BTS has “N” S-TRXs and “A” D-TRXs, where N and A are positive integers and A is less than N. When downlink TDD is implemented, a total of N+A transceivers may be used (i.e., N S-TRXs and A D-TRXs). When downlink TDD is not needed, as many as N S-TRXs may be used. When downlink TDD is not needed, typically no D-TRXs are used. Therefore, the present invention reduces the amount of resources that is required to implement downlink TDD. In addition, the present invention efficiently utilizes resources by preferably implementing downlink TDD only when it is needed.

Abstract: A master device for communicating with a number of slave devices through a communication link having a limited resource. The master device comprises a transceiver adapted for communicating with the slave devices on the communication link and a controller adapted for detecting the number of slave devices. The controller is adapted for determining an individual resource associated with a slave device to be consumed from the communication link, wherein a sum of the individual resources of all slave devices is lower than the limited resource and wherein the transceiver is adapted for assigning the individual resources to the associated slave devices.

Abstract: Provided are a method and device for separating and converting multiband signals. The device includes a photoelectric converter for converting an externally received optical signal into an electrical signal, a first switch for separating the converted electrical signal into signals according to frequency bands, a first mobile communication band-pass amplifier for amplifying a mobile communication network signal of the signals separated by the first switch, a broadband up-converter for up-converting a baseband signal of the signals separated by the first switch into a broadband signal, a first broadband amplifier for amplifying the broadband signal output from the broadband up-converter, and a transmitter for wirelessly transmitting the signals amplified by the first mobile communication band-pass amplifier and the first broadband amplifier.

Abstract: Systems and method for minimum power leakage windowing for VDSL using least squares technique are provided. A coefficient vector is defined for the first N samples. The window is then defined in terms of this coefficient vector. The leakage power of the Kth tone is defined in terms of the window. A least squares minimization is performed on the leakage power to determine the optimal value of x. The window is implemented using this value of x, thereby reducing the power leakage in the out-of-band and RFI band regions in the frequency domain.

Abstract: A method and system for providing an analog front end for multiline transmission in communications systems are described. A transceiver circuit (1100) is configured to reduce line noise by providing a coupled transmitter (1106), receiver (1106), prebalance circuit (1110), and transformer (1220) further coupled to a communication line (1264) external to the transceiver circuit. A hybrid (HY) input stage (1204) coupled to the prebalance circuit provides high frequency compensation by including a first high pass circuit coupled to the HY stage inputs, wherein the high pass circuit includes two parallel passes, each with a capacitor (C1,C5) in series with a resistor (R9,R10). A receiver input stage (RX) (RX) (1206) further coupled to the prebalance circuit provides low frequency compensation by including a second high pass circuit coupled to the RX stage inputs, wherein the high pass circuit includes two parallel passes, one with a capacitor (C3) and one with a capacitor (C7) in series with a resistor (R13).

Abstract: A method and apparatus for association of multiple PCI Express links with a single PCI Express port. The method includes: connecting a first bus interface component to a second bus interface component with a set of K lanes and set of N lanes, each lane of the set of K lanes and each lane of the set of N lanes consisting of a unidirectional and differentially driven transmitter signal pair and a unidirectional and differentially driven receiver signal pair, wherein K and N are independently whole positive integers equal to or greater than 1.

Abstract: A driver is coupled to a single conductor wire that may be electromagnetically shielded to drive serial signals on the wire, and a receiver is coupled to the wire and to the driver to receive serial signals from the wire at the same time.

Abstract: A passive full-duplex bidirectional ZPL tap includes first and second network ports and tap ports. A signal separator is configured to receive a data stream from at least one of the first or second network ports and pass through the data stream and configured to obtain a first signal portion comprising at least the first signal component and obtain a second signal portion comprising at least the second signal component. A DSP stage is configured to substantially remove any second data component from the first signal portion and to substantially remove any first data component from the second signal portion. A first receive only Phy is configured to receive the first signal portion and provide the first signal portion to the first tap port and a second receive only Phy is configured to receive the second signal portion and provide the second signal portion to the second tap port.

Abstract: An arrangement for generating a transmission clock signal and a reception clock signal is proposed in which only a single voltage-controlled oscillator is used, the reception clock signal being generated by phase-adjusting means whereas the transmission clock signal is generated directly by the voltage-controlled oscillator. Cross-talk between a plurality of voltage-controlled oscillators can be prevented in this way. Also, various measures are proposed for optimizing a circuit of this kind.

Abstract: A network tap device array including one or more passive full-duplex bidirectional ZPL network tap devices is disclosed. The array enables data from multiple nodes in a communications network to be tapped and forwarded to a plurality of monitoring devices. In one embodiment the network tap device array includes a chassis that is configured to receive a plurality of passive full-duplex bidirectional ZPL network tap devices. Each passive full-duplex bidirectional ZPL network tap device includes network ports for passing network data via communication cables and tap ports for forwarding the tapped network data to the monitoring device. In another embodiment, a sub-chassis includes a plurality of passive full-duplex bidirectional ZPL network tap devices and an aggregator that aggregates tapped data from each of the tap devices. The aggregator then forwards the aggregated data to the monitoring device. The sub-chassis can be included in a chassis that is configured to receive multiple populated chassis.

Abstract: The present invention refers to a passive echo cancellation device for use in a full-duplex communication system and its signal transceiving method. The full-duplex communication system comprises a transmitting end for sending a transmit signal to a wiring interface, and a receiving end for accepting a receive signal from the wiring interface. The passive echo cancellation device comprises an offset-signal-generating circuit and a passive echo cancellation circuit composed of a plurality of passive components. The offset-signal-generating circuit generates an offset signal according to the transmit signal. The passive echo cancellation circuit is serially connected between the wiring interface and the receiving end, and is connected with the offset-signal-generating circuit.

Abstract: There is disclosed reverse billing in online search. A telephony server may receive a request from a user to cause a telephone call to be established between the user and a merchant. A notice to the merchant may be generated. The notice may include an offer to establish a telephone call with the user in exchange for payment of a definite fee. An acceptance of the offer may be received from the merchant. A first voice communication leg with the user and a second voice communication leg with the merchant may be bridged to establish the telephone call between the user and the merchant. The definite fee may be appear on the merchant's bill for telephone service.

Abstract: A communication system transmits data in a control system for an underwater fluid well. A communications link is located between first and second facilities of the well. A data transmitter for transmitting data from one of the facilities to the other via the communications link has both a relatively high speed modem and a relatively low speed modem.

Abstract: The disclosure relates to resource allocation. In accordance with the disclosed method first information regarding a first direction of a duplex communication link and second information regarding a second direction of the duplex communication link is provided for a node. The first information and the second information are processed, and channel resources are allocated for the first direction and the second direction of the duplex communication link based at least partially on said processing.

Abstract: A method for providing a push-to-talk communication session includes facilitating a push-to-talk communication session among a full duplex endpoint supporting simultaneous two-way communication and a plurality of half duplex endpoints. Communications are received from and transmitted to the full duplex endpoint along a two-way communications path. The method includes blocking communications received from the full duplex endpoint while one of the plurality of half duplex endpoints has floor control in the communication session and receiving from the full duplex endpoint in the two-way communications path a floor control signal comprising a request to transmit communications in the communication session. The method includes, in response to receiving the floor control signal, providing floor control to the full duplex endpoint and transmitting to the plurality of half duplex endpoints communications received from the full duplex endpoint.

Abstract: Application Specific Integrated Circuit (“ASIC”) devices, such as Field Programmable Gate Arrays (“FPGAs”), may be interconnected using serial I/O connections, such as high speed multi-gigabit serial transceiver (“MGT”) connections. For example, serial I/O connections may be employed to interconnect a pair of ASICs to create a high bandwidth, low signal count connection, and in a manner so that any given pair of multiple ASIC devices on a single circuit card may communicate with each other through no more than one serial data communication link connection step. A reconfigurable hardware architecture (“RHA”) may be configured to include a communications infrastructure that uses a high-bandwidth packet router to establish standard communications protocols between multiple interfaces and/or multiple devices that may be present on a single circuit card. Dynamically-sized data packets, sized in accordance with the amount of data ready to be sent, are transferred between the devices and/or interfaces on the card.

Abstract: A method for measuring and determining the duplex modes of a network interface. The method assumes the network interface to be operating in a half-duplex mode until the bandwidth utilization reaches a threshold. When the threshold is reached, the method checks the traffic collision in the interface. If there is no collision, then the duplex mode is determined to be full-duplex. If there is collision, then the duplex mode is determined to be half-duplex and an alarm is set off. In another embodiment, the interface type is determined through SNMP. If the interface is a WAN interface, then the interface is determined to be full-duplex.

Abstract: One embodiment relates to a method for automated correction of duplex mismatches. A duplex mismatch is detected at a port of a network device, and characteristics of the duplex mismatch are determined. The configuration of the mismatched port is automatically modified based upon said characteristics. Another embodiment relates to an apparatus for automated correction of duplex mismatches. The apparatus includes a duplex mismatch detector and an automated duplex mismatch fixer. The duplex mismatch detector is configured to detect a duplex mismatch at a port of a network device and to determine characteristics of the duplex mismatch. The automated duplex mismatch fixer is configured to modify a configuration of the mismatched port based upon said characteristics. Other embodiments and features are also disclosed.

Abstract: The present invention extends to methods, systems, and computer program products for multiplexed communication for duplex applications. Embodiments of the invention facilitate a multiplexed variant of long polling over a request/reply communication medium that (potentially significantly) reduces the resources utilized when exchanging messages. The lightweight address generation mechanism facilitates polling and routing for a pool of many clients and many services while minimizing allocated resources to each established session. Further, the benefits of a lower latency bidirectional communication medium between clients and services can be utilized.

Abstract: A transceiver in a full duplex communication system includes a hybrid circuit for transmitting a transmission signal or receiving a receive signal via the channel, the hybrid circuit includes an echo cancellation device for removing transmission signal components from the receive signal; wherein the hybrid circuit outputs a processed receive signal; and a gain amplifier being an OP-RC AGC is directly connected to the hybrid circuit for amplifying the processed receive signal, wherein a first node of the gain amplifier coupled to the echo cancellation device is a virtual ground.

Abstract: A method and apparatus for a Gigabit Ethernet transceiver that has a Class-B amplifier in a main transmitter for higher efficiency and power handling capabilities. The output current of the main transmitter is produced by a reference voltage applied across a resistor, where the reference voltage generator, resistor and amplifier are fabricated on the same substrate, such that the output current is constant across process voltage and temperature. The transceiver also has a replica transmitter whose signal is used to cancel the main transmitter signal at the input of the receiver section of the transceiver. The replica transmitter is fabricated on the same substrate as the main transmitter, such that its output signal reflects non-linearities in the main transmitter across process voltage and temperature.

Abstract: In some embodiments of the present invention, asynchronous network nodes and synchronous network nodes coexist on a shared media network.

Abstract: There is provided an information processing apparatus includes a first module and a second module. The first module includes a first signal generator that produces a first signal by coding a first transmitted data into a waveform not including a direct-current component, having a polarity being inverted in each half period of a clock; a first signal sending unit that sends the first signal; and a signal subtracting unit that subtracts the first signal from a received signal. The second module includes a clock detecting unit that detects the clock based on the polarity inverting period of the first signal received from the first module; a second signal generator that produces a second signal by coding a second transmitted data into a waveform not including the direct-current component; and a second signal sending unit that sends the second signal while the second signal is synchronously added to the first signal.

Abstract: A system and method for making a band selection in a wireless communications device is provided. The available bands include a first-communication band, a second communication band, and an auxiliary band. A wideband diplexer provides a wideband path, which includes the first-communication band and the auxiliary band, and a second-communication band path. A combination duplexer couples to the wideband path, and has an auxiliary signal port, a first-band receive port, and a first-band transmit port. A standard duplexer couples to the second communication path to provide a second-band receive port and a second-band transmit port. In one example, the first communication band is the PCS band, the second communication band is the cellular band, and the auxiliary signal is a GPS satellite signal.

Abstract: A data transfer control device includes: a transmitter circuit; a receiver circuit; a transfer direction switch circuit which performs switching a transfer direction; a transfer direction switch indication circuit which indicates the transfer direction switch circuit to switch the transfer direction; and a code generation circuit which generates a transfer direction switch request code when a transfer direction switch request has been received from an upper layer circuit. When the transfer direction switch request has been received from the upper layer circuit, the transmitter circuit transmits the transfer direction switch request code through a serial signal line, and the transfer direction switch indication circuit indicates the transfer direction switch circuit to switch from a transmission direction to a reception direction after the transfer direction switch request code has been transmitted.

Abstract: A circuit is designed with a matched filter circuit including a plurality of fingers (700, 702, 704) coupled to receive a data symbol. Each finger corresponds to a respective path of the data symbol. Each finger produces a respective output signal. A plurality of decoder circuits (706, 708, 710) receives the respective output signal from a respective finger of the plurality of fingers. Each decoder circuit produces a respective output signal. A joint detector circuit (1310) is coupled to receive each respective output signal from the plurality of decoder circuits. The joint detector circuit produces an output signal corresponding to a predetermined code.

Abstract: A Time Division Duplex (TDD) wireless communication system includes a switch connected to an output port of a transmitter, a first transmission line for transmitting a transmission signal and for isolating a transmission path according to a mode, a first transmission line stub connected between the isolator and the first transmission line for reflecting a transmission signal transmitted from the isolator, a second transmission line connected between an output port of the first transmission line and an input port of a receiver for isolating a reception path in the transmission mode and for providing a reception signal received from the antenna feed line to the receiver, and a second transmission line stub connected in a stub form between the second transmission line and the input port of the receiver, for controlling the second transmission line to isolate the reception path.

Abstract: A remote switching for handset handsfree speakerphone operation in a telephone system including an “off of shelf” analog half duplex switching speakerphone IC on a base unit and routs handset handsfree signals via a RF link to and from a microphone and a speakerphone of at least one cordless handset. The remote switching provides a handset handsfree feature on any analog and digital platform that is not equipped with DSPs or other digital means for embedded speakerphone algorithms.

Abstract: A method and system for communicating within a wireless communication network (200) is provided. The communication between Portable Subscriber Units (PSUs) (104 and 106) by using a Vehicular Repeater (110) over a conventional communication link (102) is attempted (404). If the conventional communication link attempt fails (406), the communication is initiated directly from one PSU (104) to at least one other PSU (106) by using a direct channel link (202).

Abstract: A method includes providing at a first computer an application generating service requests at a duplex channel interface, at least a first service request requesting multiple subsequent data responses from a service located on a second computer. The method also includes employing a first process to convert the first service request into a first http request and transmitting the first http request over a network. The method further includes employing the first process to generate a second http request in the form of a polling request. A context reply to the second http request containing data responsive to the first service request is received. The method alsod includes providing the data response to the first service request to the duplex channel interface.

Abstract: A double ring network system configured with two or more transmission stations each including a pair of bi-directionally communicative communication ports, including any adjacent two transmission stations as terminal stations, and any transmission station as a base, as mutually connected in a ring form by communication ports through a transmission line, for intercommunications between transmission stations, in which the transmission stations are each adapted to determine whether or not frame signals are received from adjacent transmission stations, transmit route identifying frame signals for identification of routes to adjacent transmission stations, when having failed in reception, and set own station as a terminal station substituting for a current terminal station, when having received no responses to the route identifying frames from adjacent transmission stations, so they are kept from arriving at ring-like connected subsequent transmission stations.

Abstract: Disclosed is a multi-mode/multi-band wireless transceiver. The multi-mode/multi-band wireless transceiver includes a tunable duplexer including transmission and reception channel filters of which transmission and reception channel filtering frequencies respectively are controlled by an external element; and a control portion for controlling the transmission and reception channel filtering frequencies to correspond to transmission and reception channels of a current service band. Thus, a use of a RF SAW filter is unnecessary, while it is possible to support the multi-mode/multi-band using a tunable duplexer. Therefore, the number of parts and volume of the transceiver can be reduced, and it is possible to weaken a specification of an RF system.

Abstract: A terminal control system is provided that has a main control device, a plurality of terminal devices controlled by the main control device, and communication lines for connecting the main control device and each of the terminal devices so as to allow bidirectional communication, wherein the configuration is simple, communication time is short, and highly reliable bidirectional communication is possible. The terminal control system comprises a main control device 1, a plurality of terminal devices 2 controlled by the main control device 1, and communication lines 3 for connecting the main control device and each of the terminal devices so as to allow bidirectional communication, wherein control data is simultaneously and collectively sent from the main control device 1 to a plurality of the terminal devices 2, and terminal data for each of the terminal devices is independently sent from each of the terminal devices 2 to the main control device 1.

Abstract: A half-duplex terminal for displaying a holding time and a communication method therefor are provided. In the half-duplex terminal, a transmitter/receiver transmits/receives data and an acknowledgement (ACK) signal, a push-to-X (PTX) key is activated for data transmission/reception, a timer counts time upon pressing of the PTX key, a display displays a total holding time and a controller controls calculation of the total holding time based on the time count, display and counting down of the total holding time.

Abstract: A multi-channel full-duplex transceiver is disclosed. The transceiver comprises: a clock generator for generating a first clock and a second clock based on a control code; a plurality of transmitters for transmitting a plurality of outgoing signals onto a plurality of channels, respectively; a plurality of receivers for receiving, sampling, and equalizing in parallel a plurality of incoming signals from said plurality of channels, respectively, to generate in parallel a plurality of equalized signals, respectively; a symbol-rate-converters for converting in parallel said equalized signals into a plurality of refined signals, respectively. In a first operation mode, the control code is established by detecting a timing difference between an output clock of the clock generator and a reference clock. In a second operation mode, the control code is established by detecting a timing embedded in one of said refined signals.

Abstract: Simple, inexpensive, general-purpose devices and methods achieve simultaneous, full-duplex and bi-directional communication of analog, digital or audio signals across a single conductor. “Sifudu” transceivers, which stands for “simultaneous and full-duplex,” reduce the number of cables necessary for transferring information between two or more terminals at a given rate, and/or facilitate information transfer at a higher rate than traditional circuits across the same number of cables. The transceivers can accommodate both digital and analog signals of arbitrary polarity. Since a sifudu circuit is capable of transmitting analog signals, it is also capable of transmitting digital signals in frequency, phase, or amplitude shift keyed form, thus opening the possibility of realizing higher baud rate than other simultaneous bidirectional communication systems that transfer digital data only, one bit at a time in each direction.

Abstract: A method and system for managing communications in a packet-based real-time media conference. A conference server determines whether a given conference session should operate in half-duplex mode or in full-duplex mode, and the server instructs at least one participating station accordingly. In the half-duplex mode of operation, for instance, a station may engage in an implicit floor control process, in which the station treats an incoming media stream as an implicit floor denial. On the other hand, in the full-duplex mode of operation, a station would not treat an incoming stream as an implicit floor denial.

Abstract: Suitably arranged circuits located on a die surface of respective multiple dies are operatively connected via a physical link, which is configured for full-duplex operation. Data information content is transferred between the operatively connected suitably arranged circuits via the full-duplex physical link which is configured as a fragmented data interconnected (FDI) physical link allowing peer-to-peer operation and pipelining. The data information content is carried in data fragments by a self-contained data packet structure.