Abstract: A full duplex radio bridge using two transceivers coupled to a first packet network, one for transmitting data toward another radio bridge coupled to a second packet network, and the other for receiving data transmitted from the first packet network toward said second packet network by a transceiver of the other radio bridge. Each radio bridge is coupled to its packet network through one network port whose transmit data path is coupled to one of the transceivers, and whose receive data path is coupled to receive data from the other transceiver. An inner loop and outer loop is used. Management packets are routed to the various transceivers using the inner loop and outer loop by routing and filtering functions. Payload packets are transmitted from one packet network to the other using only the outer loop.

Abstract: A bidirectional communications interface is provided that connects a transmitter and a receiver, or a transceiver, to a transmission line. Under an embodiment, the bidirectional interface generates positive and negative polarity data signals using two separate differential amplifiers that receive differential signal pairs from each side of a differential link to the transmission line and the transmitter. The bidirectional interface controls common mode rejection in each of the separate differential amplifiers using bias signals generated in response to an output common mode feedback voltage from each of the differential amplifiers. An output amplifier combines the positive and negative polarity data signals to form single-ended output logic signals. The output logic signals represent data received on the transmission line, and are provided to the receiver.

Abstract: In a communication apparatus has a line control unit that controls connection with a communication line network, a communication unit transmits/receives data through the communication line network. A detection circuit detects one of a line voltage value and a line current value when the communication apparatus is connected to the line network. A memory unit stores multiple voltage-current characteristic curves defining relationships of line voltage values with respect to line current values satisfying a predetermined standard. An adjusting unit adjusts the line voltage value and the line current value so as to satisfy the predetermined standard based on one of the voltage-current characteristic curves stored in the memory unit. A selecting unit selects another voltage-current characteristic curve different from the one of the voltage-current characteristic curves from among the multiple voltage-current characteristic curves stored in the memory unit.

Abstract: An audio management apparatus manages simultaneous streams of packet-switched audio data for a network conference tool, and allows the combining of conferences that are not co-located. The apparatus uses at least two audio bridges, each of which receives audio inputs from a plurality of local connection points, does mixing of the audio data for each local connection point and provides the audio outputs thereto. Also provided is a communications link between the two audio bridges, and each of the audio bridges creates an audio mix from its local connection points and outputs it over the communications link to the other audio bridge. Each bridge may treat the audio data from the other audio bridge as it does any other call. In this way, the combining of the two conferences is accomplished in a simple and straightforward manner.

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: An adapter channel mapping system for mapping channels of a network is provided. The system comprises a memory component operable to communicate with the network and having a first and a second memory portion, the first memory portion operable to communicate with a first physical channel of the network and the second memory portion operable to communicate with a second physical channel of the network and a mapping component operable to map, based on a first map, to the first and second memory portions based on a first configuration of the network and further operable to map, based on a second map, to the first and second memory portions based on a second configuration of the network. A method for testing networks employing 568A or 568B channel adapters is also provided. A method for selectively testing networks employing different channel adapters is also provided.

Abstract: A system and method for automatically suspending power from an IEEE 802.3af Power Sourcing Equipment (PSE) switch to one or more Powered Devices (PDs) in accordance with user defined power allocation policies is disclosed. The PSE switch includes a classifier to associate each switch port with a power allocation policy and assign the applicable power priority level. The IEEE 802.3af PSE switch also includes a power manager to selectively allocate power between the PDs in accordance with those policies during a power outage, for example. If the switch is unable to provide power to each of the PDs, power to ports associated with a relatively low power priority is suspended before suspending power to higher priority ports. The policies may be automatically distributed to and implemented by multiple devices throughout a network without an administrator manually configuring the priorities base on knowledge of the specific types of end nodes coupled to the various ports or their priorities.

Abstract: A transceiver includes upstream differential signal lines DPUP and DMUP, downstream differential signal lines DPDW and DMDW, common differential signal lines DPCM and DMCM, a first transmission driver of which outputs are connected to DPUP and DMUP, a second transmission driver of which outputs are connected to DPDW and DMDW, a first switch circuit which connects the first transmission driver to a logic circuit during upstream connection and connects the second transmission driver to the logic circuit during downstream connection, a second switch circuit which respectively connects DPUP and DMUP to DPCM and DMCM during the upstream connection and respectively connects DPDW and DMDW to DPCM and DMCM during the downstream connection, and a third transmission driver connected to DPCM and DMCM.

Abstract: The invention relates to a local area network including at least one bridge terminal, which bridge terminal is provided for transmitting data between the terminals of at least two sub-networks via a wireless medium. The bridge terminal is alternately connected to the sub-networks for exchanging data. For buffering received data for an unconnected sub-network, the bridge terminal includes an intermediate store.

Abstract: A communication relay device with a redundancy function for a line in a network under a WAN environment is connected to another, having a one-to-one relationship at both ends of each line by first and second ports to configure a redundancy channel between lines. A closed port setting section sets one of the ports as a closed port, thereby configuring a network free of a loop between the respective lines. A closed port setting information notifying section notifies a counterpart communication relay device connected to the one port, via the one port, of closed port setting notifying information for notifying that one of the ports has been set as a closed port. A datagram transmission stopping section stops transmission of a datagram from a port of its own connected to the one port set as the closed port when receiving the closed port setting notification information as the counterpart communication relay device.

Abstract: In addition to a conference server 100, a record server 200 is provided. The conference data of a real-time conference is stored in a storage section 214 of the record server 200 (S2). A conference terminal 300a performs connection processing to the conference (S1) and then transmits a catch-up playback request to the record server 200 (S3). The record server 200 determines whether or not catch-up playback is enabled (S4) and then distributes the past conference data (S6), and notifies the conference terminal 300a that the catch-up playback end point has come (S7-1). Accordingly, the connection of the conference terminal 300a is switched to the conference server 100 (S9) and the conference terminal 300a is connected to the real-time conference (S10).

Abstract: In a communication system having a plurality of physical communication ports, a hierarchical bond communication interface has a logical interface as a component of the bond at a top level of the hierarchy, and a first subjugate logical interface at a second level of the hierarchy as a component of the top-level logical interface. The communication system has a control mechanism whereby thresholds may be set to determine up or down status of hierarchical bonds for use in communication, according to characteristics of components of the bonds.

Abstract: A method for communicating between an operator at an operator device and a user recipient includes enabling an operator of the operator device to enter a device-independent unique identifier for a user recipient by requiring interaction between the operator and the operator device without requiring interaction between the operator and software on the operator device that is designed for communication over an IP-based network. The method includes identifying an IP network address associated with the user recipient based on the device-independent unique identifier and routing a message entered by the operator to the determined IP network address.

Abstract: A communications system includes a base station that is configured to transmit a signal that is modulated according to a predetermined modulation scheme and an orthogonal frequency division multiplexing scheme, wherein the signal is encoded using space-frequency coding. The base station includes a plurality of multiple-input multiple-output (MIMO) transceivers. The system includes a terminal that is configured to receive the modulated signal. The above arrangement is particularly applicable to providing multichannel multipoint distribution services (MMDS) over a radio communications system.

Abstract: A communication system (100) includes a first communication unit (101, 102, 103, 104) capable of communicating over a full-duplex persistent-connection link provided by a full-duplex network (105) and a second communication unit (151, 152) capable of communicating over a half-duplex dispatch link provided by a dispatch RF system (150). The system (100) also includes a dispatch gateway (120). The dispatch gateway (120) receives signals from a first communication unit (101, 102, 103, 104) over a full-duplex persistent link through a full-duplex network (105) and provides communication between the first communication unit and a single dispatch communication unit (151, 152) or a group of dispatch communication units (151, 152) over a half-duplex communication link through a dispatch RF system (150). The gateway operates in a manner so as to permit communication between full-duplex terminals (101, 102, 103, 104) and half-duplex terminals (151, 152).

Abstract: Delays associated with real-time, interactive communications are reduced. A communications device A engages in a real-time, interactive communication with a communication device B. User A provides digital content to be transmitted to device B. A real-time, interactive connection is established between A and B which takes a certain delay time. That delay time is compensated for so that user B receives A's digital content and can respond to it faster than B could without the delay time compensation. This faster response by the B to A's communication enhances the interactive, real time, conversational feel of their communication.

Abstract: Method for setting up an isochronous data stream connection between at least one entry terminal or talker and at least one addressee terminal or listener connected by at least one bridge of a digital bus networ.

Abstract: The present invention is a method and system for non-intrusively dispatching service requests in a service node nested in a service topology. The method can include receiving a service request in the service node and identifying a requested operation and corresponding parameters for the requested operation from the received service request. A port end point address can be obtained for the requested operation and a service list can be located for the requested operation. It can be determined whether the service node is a destination hub. If so, an operation corresponding to THE service request can be invoked. Otherwise, a service node at a different level in the service topology can be selected and the foregoing process can be recursively performed.

Abstract: A method and system are provided for integrating a WLAN radio access network into a GSM/GPRS core network wherein gateways are added that transparently transport services between the two networks. A further aspect of the invention is secure authentication. The system has two network elements: a Radio Link Manager (RLM) and a Radio Access Controller (RAC), and a software application, a Multi-Link Client (MLC) to control the functionality of the integration and the authentication. The MLC resides on a user device. The RAC provides protocol stacks and interworking functions to allow the MLC to talk to a Home Location Register (HLR). The RLM and MLC set up a “tunnel” employing, for example, PPP over Ethernet (PPPOE), and all of the data packets received on this tunnel are forwarded by the RLM to the Gateway GPRS Support Node (GGSN over a further tunnel using the GPRS Tunneling Protocol (GTP).

Abstract: A method of and apparatus for optimizing signal transformation from a twisted pair transmission line to a combination transmitter and receiver for a frame-based communications network, the transmitter having a transmit output pair port for transmitting signals onto the frame-based communications network over the twisted pair transmission line, the receiver having a receive input pair port for receiving signals from the frame-based communications network over the twisted pair transmission line. A transformer is coupled between the twisted pair transmission line and each of the transmit output pair port and the receive input pair port. The transformer has a coil across the twisted pair, a transmit coil across the transmit output pair port, and a receive coil across the receive input pair port. A transfer ratio between the transmit coil and the coil across the twisted pair is optimized for transmitting signals.

Abstract: The hybrid circuit can be used to substantially reduce near echo signals. The circuit includes a balanced 2-wire to 4-wire hybrid for interconnecting a two wire receive path and a two wire transmit path to a two wire transmission line. The two wire receive path connects the balanced hybrid to an A/D converter and the two wire transmit path connects a D/A converter to the balanced hybrid. The two wire receive path contains a filter, dimensioned to remove signals transmitted from the D/A converter. The invention is particularly adapted for use with FDD and OFDD.

Abstract: A method and apparatus for recovering a second transport stream included within a first transport stream and reducing timing anomaly imparted to the second transport stream within the context of a front-end device subject to random access via a data bus, illustratively a PCI bus. A first transport stream is received from a transport medium, the first transport stream having disposed therein packets associated with a second transport stream. The first medium tending to impart jitter to the first transport stream. Those packets associated with the second transport stream are extracted from the first transport stream and adapted to reduce jitter, and launched via a second transport medium, the launched adapted packets forming a jitter-reduced second transport stream.

Abstract: An apparatus and a method for routing data in a radio data communication system having one or more host computers, one or more intermediate base stations, and one or more RF terminals organizes the intermediate base stations into an optimal spanning-tree network to control the routing of data to and from the RF terminals and the host computer efficiently and dynamically. Communication between the host computer and the RF terminals is achieved by using the network of intermediate base stations to transmit the data.

Abstract: In a network of digital signal processor nodes connected in a peer-to-peer relationship, a data packet sent to a node causes a return transmission from that node. The requester digital signal processor sends a data packet to a target digital signal processor. Upon arrival at the target digital signal processor, its receiver drives the arriving request packet into an I/O memory and triggers a transmitter interrupt. Next, the pull interrupt causes the transmitter to execute on a next packet boundary the pull request packet. Finally, the execution of the pull request causes the transmitter to pull a portion of the local I/O memory and send it back to the requester digital signal processor. The same physical portion of the I/O memory is overlaid with two logical uses, a receiver channel and a transmitter code block.

Abstract: Proposed is a method for reducing interference in a frequency hopping wireless communications system. In one embodiment of the present invention, a base station and a terminal station each using an orthogonal frequency division multiplexing (OFDM) technique to simultaneously measure an interference level for each system frequency and to enable high speed frequency hop pattern changes which can follow changes in desired and interfering signal levels due to changes in co-channel interference or shadow fading. The terminal station interference level measurement values are then transmitted to the base station. Next, the base station identifies each frequency hop pattern currently in use by each terminal station communicating with that base station.

Abstract: Data signals from a telecommunication network are routed to a gateway which generates analog signal distributed to receivers within a customer premises. A network interface device receives digital signals from the telecommunication network. A first diplexer has a digital signal port connected to the network interface device. The first diplexer combined signal port is connected with the combined signal port of a second diplexer. The gateway receives digital signals from the second diplexer digital signal port and provides analog signals to the second diplexer analog signal port. Analog signals are then available to receivers at both the first diplexer analog signal port and the second diplexer analog signal port.

Abstract: In one aspect of the present invention, a network gateway is configured to facilitate on line and off line bi-directional communication between a number of near end data and telephony devices with far end data termination devices via a hybrid fiber coaxial network and a cable modem termination system. The described network gateway combines a QAM receiver, a transmitter, a DOCSIS MAC, a CPU, a voice and audio processor, an Ethernet MAC, and a USB controller to provide high performance and robust operation.

Abstract: A communication apparatus comprising a semiconductor DAA, a system unit and a modem is provided. The DAA has a line control unit connected to a communication line network and a serial IF unit connected to the line control unit via an isolating circuit, and controls the communication line network and transmits and receives data. The modem modulates and demodulates the transmitted and received data. The system unit controls the semiconductor DAA and the modem. The line control unit includes a line current detector for detecting a line current and a line voltage detector for detecting a line voltage. The system unit obtains line impedance based on the line current and the line voltage, and adjusts the transmission level of the modem in accordance with the obtained line impedance.

Abstract: A method is provided for fairly allocating bandwidth to a plurality of devices connected to a communication link implemented as a plurality of point-to-point links. The point-to-point links interconnect the devices in a daisy chain fashion. Each device is configured to transmit locally generated packets and to forward packets received from downstream devices onto one of the point-to-point links. The rate at which each device transmits local packets relative to forwarding received packets is referred to as the device's insertion rate. A fair bandwidth allocation algorithm is implemented in each (upstream) device to determine the highest packet issue rate of the devices which are downstream of that (upstream) device. The packet issue rate of a downstream device is the number of local packets associated with the downstream device that are received at the upstream device relative to the total number of packets received at the upstream device.

Abstract: A space-based network router architecture (20) is disclosed. The router includes an array-of-processors architecture (20) for routing uplink and downlink traffic of a communications system (10). The architecture comprises multiple node interface chips (26) linked to one another via horizontal and vertical rings (22, 24), thus forming a mesh (21). Associated with each node interface chip (26) is a processor (28) and either a demodulator (30) or modulator (32). Each node interface chip (26) selectively transfers a signal depending upon the particular signal's destination and processing requirements. The router architecture (20) provides scalabitly, fault-tolerance and flexibility, as well as structural advantages over present router systems.

Abstract: An adapter permits bi-directional communications between a full duplex mode, two data wire serial data bus and a half duplex mode, one data wire serial data bus. Settings or preferences for the full duplex mode bus may be set by the half duplex mode bus using a command format. Processing by the adapter controller may be interrupt driven, except during the processing of the half duplex mode serial data bus, when the interrupts may be disabled.

Abstract: The invention relates to communications systems, and especially to real-time data (two-party or multi-party) communication in communications systems. A real-time data item is sent from a sending terminal to a number of receiving terminals over a communication system. In accordance with the present invention, each receiving user terminal acknowledges the reception of the item by sending an item acknowledgement report after the end of the item. The acknowledgement report may be sent after a successful reception of the item, unsuccessful reception of the item or in both cases.

Abstract: A method and corresponding apparatus for communicating a controller area network (CAN) message between a sending node, attached to a sending CAN network, and a receiving node, where the sending and receiving nodes are interconnected by a network communicating according to transmission control protocol/Internet protocol (TCP/IP). The invention provides for having the sending node extract the CAN message payload (arbitration field, control field and data field if any) from a CAN message, having it embed the CAN message payload in a TCP/IP frame as the TCP/IP data field of the TCP/IP frame, having it refer to a routing form to determine the address on the TCP/IP network of the receiving node; and having it transmit the TCP/IP frame over the TCP/IP network using the address for the receiving node from the routing form.

Abstract: The invention provides tele-jam a system and methods for establishing ensembles or groups of participants by a variety of original organizational methods such that the participants interact in real-time (quasi-real-time) in a desired format (strictly predefined format, loosely defined format, or spontaneous format). A host system is provided having servers and client electronic apparatuses connected to the host system by electronic data network. A database of characteristics is stored in the host system, the characteristics including musical details, queries, responses triggered by queries for classifying users based on queried, experimentally detected, or previously stored data including network data transfer delay. Data streams are formed from user's input data and placed on queues corresponding to the particular classifications, and groups of arranged users. Algorithms in the system act on the supplied and/or detected information with capability for subsequently switching/bridging together.

Abstract: A bridge terminal of a local area network is provided for transmitting data between the terminals of at least two sub-networks via a wireless medium. The bridge terminal is alternately connected to the sub-networks for exchanging data. For buffering received data for an unconnected sub-network, the bridge terminal includes an intermediate store.

Abstract: A method for routing a packet received in a packet router is taught, the method comprising the steps of selecting a logical interface having multiple physical ports as a destination for the packet, processing any one or more addresses or labels of the packet and other packets received by a common function, producing thereby results unique to the packets in which the addresses and labels processed differ, (c) mapping the physical ports at the destination to the unique results produced by processing the addresses or labels of packets, and (d) routing the data packet according to the mapping. Weighting is applied to physical ports in the mapping, the weighting reflecting different transmission capacities of the ports. Apparatus for practicing the invention is taught as well.

Abstract: The present invention provides a method of controlling a call between nodes in a distributed node exchange network having interconnections of plural exchanges, wherein a distributed node has a channel switch, a subscriber circuit, a trunk circuit accommodating local lines and private lines and a processor for controlling a call of the nodes. In a case of connections between the nodes, the node call control processor accommodating call extension lines and the other node call control processor accommodating receiving extension line in correspondence to the call extension lines carry out distributed processings of the call control for providing substantially the same connection services as the interconnection in the node.

Abstract: A method for performing communications over a network comprises receiving a user record for a first user, receiving a query from a second user with regard to the first user, and sending, to the second user, as a response to the query, a call-handling profile.

Abstract: A bi-directional signal coupler is incorporated into a transmission/reception communication system and is used for the transmission and reception of signals over a single transmission medium. The bi-directional signal coupler includes a primary nulling device for removing a signal to be transmitted through the bi-directional signal coupler from a signal to be received into the bi-directional signal coupler. The primary removing device provides an output signal representative of the signal to be received plus the signal to be transmitted wherein a level of the signal to be transmitted is removed to a first extent relative to a level of the signal to be received. At least one additional secondary device is provided for removing the signal to be transmitted from the signal to be received in a successive manner.

Abstract: An apparatus and a method for routing data in a radio data communication system having one or more host computers, one or more intermediate base stations, and one or more RF terminals organizes the intermediate base stations into an optimal spanning-tree network to control the routing of data to and from the RF terminals and the host computer efficiently and dynamically. Communication between the host computer and the RF terminals is achieved by using the network of intermediate base stations to transmit the data.

Abstract: An initialization of local buses 14a to 14n, a definition of topology and a management of isochronous resources are performed for every local bus. Each of portals 12a to 12n includes an asynchronous packet discriminator 215 which discriminates an asynchronous packet sent by a terminal device and transfers it. The portals 12a to 12n discriminate asynchronous packets sent by terminal devices in order to acquire isochronous resources and secure isochronous resources on different buses. The portals 12a to 12n transfer isochronous packets to different local buses by associating a received isochronous packet with a plug on the bridge bus side and a plug on the local bus side with an isochronous channel on the bus. Thus, the utilization efficiency of bus resource in a serial bus network is improved and a packet sent from a terminal device can be transferred to a different bus.

Abstract: A ring-bus transition 100 is provided which for switching signals between inputs 140-144 and outputs 180-85. First, signals are received at a number of inputs 140-144. Each input is coupled to a demod 130-134. Each demod is coupled to a communication ring 151-160 which is in turn coupled to a bridge 190. Signals received at the inputs 140-144 are demodulated at the demods 130-134 and then sent via the communication rings 151-160 to the bridge 190. The bridge relays the signals to a communication bus 195 which in turn relays the signals to output processors 170-175. Each output processor 170-175 may receive and stores signals destined for it in a memory queue 230. The signals may then be output in the order they arrive or in some other order based on a priority signal. Additionally, each communication ring 151-160 may be closed by connecting the bridge 190 to the first input on each loop.

Abstract: The present invention pertains to a system for transmitting data. The system comprises a network on which free topology transmission of data occurs. The system comprises a first node. The system comprises a second node. The system comprises a shared free topology modem connected to the network and the first and second nodes for transmitting signals from the first and second nodes. The present invention pertains to a method for transmitting data. The method comprises the steps of transmitting data from a first node on a balanced line two-wire differential network to a free topology modem. Next there is the step of transmitting the data from the first node to the free topology network on which free topology transmission of data occurs with the free topology modem. Then there is the step of transmitting data from a second node on the balanced line two-wire differential network to the free topology transceiver.

Abstract: A radio based access network type Digital European Cordless Telecommunication DECT in which powerful and simply-built up network components, such as repeaters are an integral part. The device makes possible a signaling which makes digital decoding and adding a special capacity to the system unnecessary.

Abstract: An asymmetric network communication system having a packet and an acknowledgment packet suppression system for use in a client-server environment having forward and return channels operating at different speeds and/or under different protocols on the same or different communication media to provide efficient utilization of shared resources. A network manager, such as a hybrid access system, effects transmission of packetized data on a forward (downstream) channel from the host server to multiple client devices coupled with a shared downstream media at 10 or more megabits per second while simultaneously providing selectable multiple lower speeds of operation on shared or dedicated return (upstream) channels from the client devices to the host server depending on bandwidth availability, bandwidth demand, service level authorization, etc. for the return channel.

Abstract: A redundant bus bridge system for communicating between a first bus and a second bus includes a first clock generator operative to produce a first clock signal and a second clock generator operative to produce a second clock signal. A first bus bridge, e.g., a first RAID controller, connects the first bus and the second bus and is responsive to the first clock generator and the second clock generator. The first bus bridge is operative to transfer data between the first bus and the second bus in synchronism with a selected one of the first clock signal and the second clock signal. A second bus bridge, e.g., a second RAID controller, connects the first bus and the second bus and is responsive to the first clock generator and the second clock generator. The second bus bridge is operative to transfer data between the first bus and the second bus in synchronism with a selected one of the first clock signal and the second clock signal.

Abstract: An asymmetric network communication system for use in a client-server environment having independent forward and return channels operating at different speeds and/or under different protocols on the same or different communication media to provide efficient utilization of shared resources. A network manager, such as a hybrid access system, effects transmission of packetized data on a forward (downstream) channel from the host server to multiple client devices coupled with a shared downstream media at 10 or more megabits per second while simultaneously providing selectable multiple lower speeds of operation on shared or dedicated return (upstream) channels from the client devices to the host server depending on bandwidth availability, bandwidth demand, service level authorization, etc. for the return channel.

Abstract: A system for converting between parallel data and serial data is described. In the system 10, individual bits of the parallel data 12 are latched into individual registers 117. Each register 117 is coupled to a corresponding AND gate 110 which is also connected to receive phased clock signals. The output terminals of the AND gates 110 are connected to an OR gate 115. Using the system, with appropriately phased clocks, the parallel data is converted into serial data.

Abstract: A network transmitter device and network receiver device is described. The network transmitter device transmits a first voltage potential, a second voltage potential, a third voltage potential and a fourth voltage potential over a first pair of output lines and a second pair of output lines in response to digital signals received over a data input. The network receiver device receives network signals of a first voltage potential, a second voltage potential, a third voltage potential, a fourth voltage potential and a fifth voltage potential over a first pair of output lines and a second pair of output lines. The network receiver device transmits digital signals corresponding to the network signals.