Abstract: An analog electronic circuit is placed between the central office of a telecommunications provider and the customer premises equipment of a digital subscriber line system which uses unshielded twisted pair wires (“UTP”). The electronic circuit separates the downlink signals from the uplink signals with a first mixer. The voice signals, if present, are routed around the electronic circuit unmodified. The downlink signals are amplified, filtered, amplified again with a one or more peaking equalization amplifier, then amplified with drivers which provide the power to drive the downlink signal through a second mixer onto the UTP lines to the customer premises equipment. The electronic circuit separates the uplink signals from the downlink signals with the second mixer. The uplink signals are amplified, filtered, and amplified again, then driven onto the UTP connected with the central office through the first mixer.

Abstract: When a mobile station communicates with a base station by way of one or a plurality of other mobile stations, the mobile station acting as a relay station determines whether the data demodulated after being received is reception data for the mobile station or transfer data to be transmitted to the other mobile station or the base station, decides a modulation mode suitable for transmitting sum data of the transfer data and transmission data if the transmission data is generated in the mobile station, and transmits the sum data while modulating the sum data according to the modulation mode decided. The base station demodulates a reception signal relayed by the mobile stations according to the modulation mode of the mobile station having directly communicated with the base station, and identifies each user data multiplexed.

Abstract: A circuit for transmitting and receiving communications. The circuit includes a transmit block, a receive block, and an echo canceller, coupled to the transmit block and to the receive block, for determining an echo signal and subtracting it from the received signal, the determination of the echo signal involving a predetermined number N of coefficients calculated at the beginning of each of the communications in an initialization phase. The circuit periodically updates during communication a restricted group of coefficients chosen from among the most significant coefficients. The present invention also relates to an echo cancellation method.

Abstract: A method of implementing a repeater in a data transmission system, and a transceiver unit for a data transmission system is provided, whereby the transceiver unit includes a first and a second transceiver block which can function in parallel on different frequency bands with the same part of the data transmission connection, a mechanism for allowing the series connection of the transceiver blocks, and mechanisms for connecting the transceiver unit to the data transmission connection such that the receiver input and transmitter output of the first transceiver are connected to the first part of the data transmission connection and the receiver input and transmitter output of the second transceiver block are connected to the second part of the data transmission connection.

Abstract: Radio communication apparatus includes a baseband processor for modulating data to be transmitted into an IF signal and for demodulating an IF signal derived from a received high frequency signal. A front end section receives the IF signal from the baseband processor and converts that IF signal into a high frequency signal for transmission. The front end section also is adapted to receive a high frequency signal from a remote location, and converts the received high frequency signal into an IF signal that is supplied to the baseband processor for demodulation and data recovery. The front end section is operable in a plurality of frequency bands and is tunable to a frequency within a selected one of the frequency bands for use as a radio frequency channel. Consequently, the number of simultaneously assigned channels in the same area can be markedly increased and the possibility of interrupting a communication link is significantly reduced.

Abstract: A modem relay provides a local interface to the a modem on both ends of a call, demodulates the full duplex data stream, packetizes the bits for transport over an IP network, and remodulates the data stream at the remote end. The modem relay negotiates a best supported rate and modulation. If no common rate and modulation is supported by the modems at each end of the communication, the modem relay components will establish independent connections to the modems at each end and transmit information across the packet network. The modem data stream can also be transported in a redundant fashion, which allows for seamless error recovery in the event of single or double packet loss events. Since the data stream can be completely recovered after packet loss, the remote modem is able to recreate the local modem's transmission exactly.

Abstract: A digital serial communications hub has the ability to delay, route and regenerate data on the fly at mixed baud rates, mixed character framing bits, and mixed protocols without prior setup. In addition, the communications hub stores and retrieves serial data in the time domain, and employs a simple and reliable error correction routine that takes advantage of the time domain format of the data. Physically, the communications hub is implemented as a circuit card integrating a central processor with several serial communications ports. The serial ports connect to a combination of electrical interfaces that include RS232, RS485, TTL, and Fiber Optic. The serial communication ports are routed through a central flow processor that controls data flow into and out of the circuit card via serial communications connectors.

Abstract: An apparatus of a digital echo canceller comprises a first-set delay circuits, a selector, a second-set delay circuits, a plurality of multipliers and an adder. The first-set delay circuits are arranged into groups, and each group has N delay circuits. An exhaustive search function is carried out to produce a plurality of energy sums. The selector will select the biggest energy sum to serve as a significant part and then transmit to the outputs of the second-set delay circuits, the multipliers and the adder. An estimated echo signal is produced to cancel the echo signal.

Abstract: An improved enhancer is disclosed which uses a switch matrix to increase the isolation between two antennas. For either an reverse link or forward link communication, the enhancer has a first antenna for receiving an incoming signal, and a receiver sub-system that amplifies and converts the incoming signal from the first antenna to a first predetermined frequency band. The enhancer further has a demodulator coupled to the receiver sub-system for demodulating the converted signal, and detecting timing information thereof. Also contained in the enhancer is a transmitter sub-system operable with the receiver sub-system that converts the signal from the receiver subsystem to a second predetermined frequency band and further amplifies the signal. After the signal is thus enhanced, a second antenna is used for further transmitting the amplified signal from the transmitted sub-system.

Abstract: A multi-path transceiver apparatus, method and system for implementation in a bidirectional antenna path by which a transceiver output signal is provided with a path independent from a separate signal path provided for incoming signals. The invention facilitates the amplification of transmitted signals without damaging the received signals and avoids modification to transceiver and bidirectional antenna hardware.

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 full duplex interface apparatus for a high performance serial bus is provided. More particularly, an IEEE 1394 interface apparatus is provided which includes a port switch having two ports coupled to a source generator device and a display device and separately receiving and buffering received signal packet data streams from the physical layer and transmit signal packet data streams for transmission over the physical layer. Accordingly, by coupling the source generator unit which generates signals for transmission over the physical layer through a first port of the port switch and the display unit to a second port of the port switch, ISO signals such as video signals may be received from the physical layer and provided to the display unit at the same time as ISO signals are being transmitted from the source generator unit to the physical layer through the port switch.

Abstract: A method and apparatus for bus repeater tapering. The sizing of repeaters on a portion of one transmission line is chosen to propagate a signal transition at a particular rate. The sizing of repeaters on a substantially parallel portion of another transmission line, is chosen to propagate a second signal transition at a different rate. Thus, the worst-case capacitance coupling factor between the two transmission lines may be reduced.

Abstract: A network switching hub is implemented on an IC chip, and has a bus connected to external ports through sets of queue switch transistors, source to drain for data switched onto the bus, the queue switch transistors gated simultaneously by control lines from an on-board arbitrator controller following a preprogrammed arbitration scheme. Data is switched off the bus and hub by port adapter controllers connected to read amplifier receivers connected directly to the on-chip bus, the port adapter controllers enabled by the arbitrator controller following the same preprogrammed arbitration scheme. Ports may be serial or parallel, and may be adapted to special purposes, such as PCI and hub to hub connection for expansion.

Abstract: An apparatus for deployment in an outdoor environment for extending the electrical communication distance of digital data signals includes electrical isolation means for various electromagnetic effects and a high speed pulse reshaper and repeater. The isolation means includes low capacitance electric pulse suppression means so that maximum signal distance can be achieved without loss of usable pulse shape and isolation transformers on differential signal pairs that retain magnetization at elevated temperatures so that signals are not blocked. As a further feature, extended logic is included whereby the type of signals can be distinguished, thus allowing the apparatus to be daisy-chained with like apparatus or used between a termination and a line.

Abstract: Information corresponding to a half duplex voice call over a packet network is delivered to unavailable members of a group through alternate communication services. A call request for half duplex voice calls over a packet network is received at a communication server where the call request indicates a group. Packets corresponding to the voice call are converted into an alternate formatted message and delivered, through an alternate communication system, to unavailable members of the group not able to engage in the voice call at the time of the call. The alternate formatted message such as Instant Messaging (IM) message or voice mail message is delivered to the unavailable member when that member is able to receive such a message.

Abstract: A single node is constituted by a core node that carries out overall management of the node and extended nodes that are connected by transmission lines to the core node. The core node comprises: an Operation Administration & Maintenance (OAM) function part for managing the extended nodes; N common function parts for receiving and outputting by way of transmission lines OAM signals generated by the OAM function part and main signals, and an aggregate-side interface. The extended nodes each comprise individual interfaces and a common function part for processing main signals and OAM signals that are communicated over the transmission lines. The core node and extended nodes are each arranged in appropriate locations and are each housed in individual cases.

Abstract: A system, method, and apparatus for increasing the data rate on an existing repeatered telecommunication channel structure. In illustrative embodiments, replacement transceivers and replacement repeaters provide for transferring data streams via the existing channel structure at a rate substantially greater than the data transfer rate of the existing channel structure. The replacement transceivers and replacement repeaters are spectrally compatible with existing services and provide data transfer performance equal to or better than the performance of the existing channel structure.

Abstract: This invention discloses a long-distance network transmission structure and associated device thereof. The invention utilizes the CAT-5 transmission line network to achieve a high-speed long-distance network tranceiving. A DSP PHY (Digital Signal Processing Physical) is employed in the long-distance network transmission structure to receive a data signal from the transmission line. The signal is then driven to clients with a common PHY without DSP capability or a DSP PHY. Through such a DSP PHY, the signal can be transmitted over 3000 ft and the transmission rate can reach duplex 100 Mbps. Two pairs of cords inside the CAT-5 network transmission line are used to provide the full duplex data tranceiving and the other two spare cords provide electrical power for a repeater. Therefore, the long-distance transmission structure and associated device thereof can effectively reduce the cost for both network service providers and clients and facilitate the installation.

Abstract: A repeater, useable for connecting switches in a data communication network, is provided in a distributed and/or modular fashion. The repeater includes a plurality of separate and distinct components or modules connected to or at least partially housed in, the various switches which the repeater modules couple. Preferably, the repeater autodetects and/or autoconfigures some or all aspects of repeater operations, such as detecting and/or configuring appropriate full/half-duplex mode operation or detecting and/or configuring in response to appropriate or approved cable-type connections. The distributed and/or modular repeater facilitates accommodating various switching or repeater needs as a network grows or contracts.

Abstract: A duplexer includes an input/output line, a receive segment and a transmit segment. The transmit segment is connected to the input/output line. The receive segment includes a balun and a differential filter. The balun includes a first output, a second output, a first transmission line and a second transmission line. The first transmission line is connected between the input/output line and the first output. The second transmission line is connected between the input/output line and the second output. The differential filter is connected to the first output and the second output. The differential filter shorts the first output and the second output at transmit band frequencies of the duplexer.

Abstract: A satellite-based communications system (20) includes a communication satellite (22) using a Time Division Duplex (TDD) frame structure. The communication satellite (22) transmits first data (63) during a first sub-frame (150) and receives second data (65) during a second sub-frame (152) of a time division multiple access (TDMA) frame (144). A terrestrial repeater (30) receives the first data (63) using a first link (36) during the first sub-frame (150), delays the first data (63) by a sub-frame duration, and transmits the first data (63) to a subscriber unit (32) using a second link (42). The terrestrial repeater (30) receives the second data (65) from the subscriber unit (32) using the second link (42), delays the second data (65) by the sub-frame duration, and transmits the second data (65) using the first link (36) to the satellite (22) during the second sub-frame (152).

Abstract: A method of implementing a repeater in a data transmission system, and a transceiver unit for a data transmission system, whereby the transceiver unit (9) comprises a first (71) and a second (72) transceiver block which can function parallel on different frequency bands with the same part of the data transmission connection, means (91) for allowing the series connection of said transceiver blocks (71 and 72), and means (tx1, rx1, tx2, rx2) for connecting the transceiver unit to the data transmission connection such that the receiver input and transmitter output of the first transceiver block (71) are connected to the first part (3A) of the data transmission connection and the receiver input and transmitter output of the second transceiver block (72) are connected to the second part (3B) of the data transmission connection.

Abstract: A device and method are disclosed for providing a phone LAN routing LAN traffic internally within Customer Premise Equipment (CPE) and for routing analog and digital traffic from a Public Switched Telephone Network (PSTN) to the CPE. A phone hub routes LAN traffic and incoming voice and ADSL to network elements having a network interface controller (NIC). Analog voice signals are transparently coupled through the phone hub. Inbound ADSL data is transported using the phone hub at LAN frequency to a NIC. Outbound ADSL data transported to the phone hub at the second frequency is frequency shifted by the phone hub back to the first frequency for transport over the PSTN. Broadband 10BASE-T Ethernet frequencies are accommodated using customer premise wiring.

Abstract: Symmetric flow control in a buffered repeater having responsiveness to flow control frames. An Ethernet full duplex buffered repeater according to the present invention includes an internal arbitration mechanism allowing receive FIFOs of respective receive ports to transmit data over a local bus to remaining transmit ports in round-robin fashion. The transmit ports take the transmitted data off the local bus and transmit it over the respective link. Each transmit port monitors the capacity of an associated transmit FIFO, and when the available capacity falls below that required to store a maximum size frame, asserts an open collector output signal monitored by each of the ports. No port initiates transmission of a packet over the local bus when this signal is asserted. Rather than one of the transmit ports risking being unable to store a complete frame once transmission has begun, the local bus is suspended before the next frame is put on the local bus.

Abstract: A communications system (100) has at least one TDD platform pair (130, 200) operating synchronously using a Time Division Duplex (TDD) frame structure. A TDD platform pair (130, 200) has first communications platform (124) and second communications platform (126) that are coupled (135) together. First communications platform (124) transmits first data during a first frame and receives second data during a second frame. Second communications platform (126) receives third data during the first frame and transmits fourth data during the second frame. At least one TDDSU (110) receives the first data, transmits the second data, transmits the third data, and receive the fourth data. First communications platform (124) has a first coverage area, and the second communications platform (126) has a second coverage area. A dual coverage area exists where the first coverage region overlaps the second coverage region. At least one TDDSU (110) is located within the dual coverage region.

Abstract: A system and method for remotely powering an Ethernet network repeater through an attachment unit interface (AUI) between the repeater and a remote personal computer (“PC”) or workstation. The AUI includes logic circuitry to detect when the Ethernet is supporting a transmit signal and a receive signal. Associated with the AUI is a DC to DC converter which receives, remotely through the AUI interface, a DC voltage from the PC or workstation and converts the DC voltage into working voltages for the remote repeater.

Abstract: This invention relates to duplex and to half duplex transmission schemes and more particularly to the application of such schemes in TDMA and other multiple access environments. In accordance with a first aspect of the invention, there is provided a method of multiplexing signals transmitted by a number of terminals onto a communications link; the link having a capacity less than the total capacity of the terminals; the method including the step of varying the rate of encoding of said signals transmitted by said terminals whereby the bandwidth o the transmitted signals corresponds to the portions allocated to the terminals. In accordance with another aspect of the invention, there is provided a system for the communication of signals in real time over a channel; said system adapted to vary the bandwidth of at least one signal such that the number of signals multiplexed onto said channel can be dynamically varied.

Abstract: A circuit and method comprising a physical layer circuit, a select circuit and a repeater circuit. The physical layer circuit may be configured to present a number of shared signals and a number of individual signals. The select circuit may be configured to connect one or more said first number of shared signals to one of a second number of shared signals, where the second number of shared signals may be less than the first number of shared signals. The repeater circuit may be configured to receive the number of individual signals and the second number of shared signals.

Abstract: A high speed data network having a novel data translator having an SRAM data buffer in the full to half duplex direction and flow control media access elements, such as for detecting data collision and retransmission of data, for providing transparent high data rate transfer between full and half duplex data media. The main SRAM data buffer provides multiple frame FIFO storage and configured to provide alternating incoming and outgoing data access. The preferred embodiment further includes main SRAM incoming FIFO and outgoing FIFO memories. The outgoing FIFO memory is configured to operate in an alternating in/out memory access (independent of the main SRAM incoming and outgoing data access) providing data byte access after the byte is written from the main SRAM. Furthermore, the outgoing FIFO memory supplies the data to be retransmitted in the event of a data collision, without interrupting the operation(s) of the main SRAM buffer.

Abstract: The invention provides radio communications with an up-down signal link. In accordance with the purpose of the invention, as embodied and broadly described herein, the invention is directed to a method, system and computer readable medium with program instructions (hereafter collectively referred to as "the invention"). The invention includes receiving a downstream signal in a receiver portion of an outdoor unit, producing in the receiver portion of the outdoor unit an intermediate frequency (IF) signal from the downstream signal, and processing the IF signal in the receiver portion of the outdoor unit to produce a clean line code signal.

Abstract: A frequency band, or test band, located between the uplink and downlink frequency bands of a distributed, frequency duplexed network is used in a novel way to isolate block-level faults within the network. A test signal having frequencies within the test signal band is generated and fed into a downlink path of a branch of the communication network. When the test signal encounters a remote station having duplexing means, the test signal leaks through the duplexing means into an uplink path of the remote station. This occurs because the real filters of the duplexing means do not work perfectly, frequencies outside of the uplink and downlink bands, especially those in the test signal band, will leak through its components. The amount of attenuation of the test signal in leaking through the communication station indicates the operability status of the components therein. By monitoring the power level of the test signal in the uplink and downlink paths of the branch, faults can be quickly isolated.

Abstract: A transceiver for exchanging data with a transmission channel using any of the 100BaseT2, 100BaseTX, or 100BaseT4 standards, which includes a receive circuit for receiving analog data from the transmission channel. The receive circuit includes a first switch and a first analog-to-digital converter coupled to the first switch. The receive circuit further includes a second analog-to-digital converter coupled to the first switch. There is further included a second switch coupled to the first analog-to-digital converter and to the second analog-to-digital converter. The analog data is switched by the first switch into the first analog-to-digital converter and the second analog-to-digital converter to allow the first analog-to-digital converter and the second analog-to-digital converter to support sampling requirements of any of the 100BaseT2, the 100BaseTX, or the 100BaseT4 standards.

Abstract: A repeater for use in a two way communication system for retransmitting information between a first device and a second device to help ensure reliable two way communication between the devices, comprising: a transmitter/receiver, the transmitter/receiver receiving signals from the first and second devices and transmitting the received signals for reception by the respective first and second devices; and further wherein a direct communication path for the information between the first and second devices is provided, the direct communication path being intermittently unreliable, the repeater providing an additional path for the information between the first and second devices; the repeater being spaced from said first and second devices by a specified distance, said specified distance being significantly less than a theoretical maximum communication distance thereby to ensure communication reliability.

Abstract: A universal local area network power line carrier repeater system and method provides: 1) LAN interfaces for converting high speed LAN data to high speed PLC data and high speed PLC data to high speed LAN data, 2) a high speed PLC data transceiver for exchanging PLC data with other repeaters, and 3) a repeater control system and method for arbitrating data communications on the power line medium among the plurality of repeaters seeking access to said medium.

Abstract: A shared receiver demand priority repeater for use in a shared receiver demand priority repeater network having at least two transmission media, has a demand priority repeater core. A receiver is coupled to the demand priority repeater core. A multiplexer is coupled between the receiver and the at least two transmission media. A transmitter for each the transmission media is coupled between the demand priority repeater core and the transmission media. Wherein the multiplexer couples a selected one of the transmission media to the receiver in response to the demand priority repeater core.The multiplexer can comprise an address selectable switch.A method is described for interfacing a demand priority repeater core to at least two downlinks, each downlink coupled to a device.

Abstract: A repeater for use with Time Division Duplex (TDD) communications such as CT2 delivered over mains electricity cables. The repeater is coupled to a mains cable via a branch (the cable is not broken) and in alternate TDD phases converts signals from f.sub.1 .fwdarw.f.sub.2 or f.sub.2 .fwdarw.f.sub.1 and amplifies them. A clock signal to control timing of the conversion step is derived from a dedicated channel, a tone, or a call in progress. A regenerator function may be combined with the repeater.

Abstract: The object of the invention is to employ a single amplifier for both the transmit and the receive signals in an RF repeater for interfacing with a base station for exchanging transmit and receive signals in a time division duplex cordless telephone system. A multicarrier amplifier having an input and an output and a transfer switch connected to the amplifier output and the amplifier input and having first and second switch states. The operation of the switch is controlled so that the transmit and receive signals are amplified by the amplifier. The other object is to chain RF repeaters so that the handset can roam over a roamer corridor covered by the RF repeaters. The RF repeaters are provided with a dedicated signal link.

Abstract: One, or more, ISDN interfaces have their reach extended without violating ISDN interface standards by a method which converts ISDN coded information which is to be delivered over an extended channel into binary coded data prior to transmission, transmitting the binary coded information to a receiver at an extended location and there, after storage, and assembly, converting the binary coded data into ISDN specific coded data for delivery to an ISDN interface.