Abstract: A system for transporting radio frequency (RF) signals across a RF network comprises a central transport unit and a remote transport unit. The frequencies of at least some of the RF signals to be transported hop in accordance with predetermined hopping sequences. The central transport unit uses the hopping sequences to convert the hopping frequencies into fixed frequencies for efficient transport through the RF network. The remote transport unit uses the hopping sequences to convert the fixed frequencies back to the original hopping frequencies. The transport system is also capable of reverse operation in the direction from the remote transport unit to the central transport unit.

Abstract: The present invention provides a facility transport system for transporting Ethernet over digital subscnber lines. The system, termed 10BaseS, is capable of transmitting 10 Mbps Ethernet over existing copper infrastructure. The system utilizes carrierless amplitude modulation/phase modulation (CAP), a version of suppressed carrier quadrature amplitude modulation (QAM). The 10BaseS transport facility can deliver symmetrical data at approximately 13 Mbps (net 10 Mbps) over the unscreened, twisted pair telephone wires originally intended for bandwidths between 300 Hz and 3.4 KHz. The system utilizes frequency division multiplexing (FDM) to separate downstream channels from upstream channels. FDM is also used to separate both the downstream and upstream channels from POTS signals. The downstream and upstream data channels are separated in frequency from bands used for POTS and ISDN, enabling service providers to overlay 10BaseS on existing services.

Abstract: A mechanism conveys information pertaining to transmission priority (TP) levels of inbound packets transmitted over a heterogeneous network from a switching node to a hybrid node of the network. The mechanism comprises a packet-recognizing filter having a format that is generated by the hybrid node and dynamically transmitted to the switching node over a predefined communication channel of the network. The filter enables the switching node to classify the inbound packets and assign them appropriate TP levels.

Abstract: A data transfer flow control system for a packet communications system includes a plurality of nodes interconnected by transmission links. The rate at which a sender node transmits information to a destination node in a network is modified in accordance with congestion information returned to the sender node from nodes along the path of the transmission or from the information receiver. The rate change for information being sent from the sender node is modified based upon the amount of elapsed time occurring since the last rate change of the same type. In first and second examples, the rate change is implemented in accordance with exponential and linear relationships, respectively, between the modified flow rate and the elapsed time since the last rate change.

Abstract: An ATM (asynchronous transfer mode) exchange apparatus which processes data transmitted in units of ATM cells over a communication line based on an ATM system, include a control data adding circuit for adding predetermined control data at the position of header error control data included in a header region of each of the ATM cells and an exchange processing circuit for carrying out exchange processing with respect to an ATM cell transmitted based on the control data.

Abstract: For transmitting GSM data in a communication network (PSTN), a predefined frame format (TRAU) is preserved in the communication network (PSTN) for mobile stations (TL1, TL2). This predefined frame format (TRAU) is preserved even if the coding rates in the uplink and downlink are different. Recoding, in particular, takes place only in the downlink with the advantage that the uplink and downlink are completely isolated from one another regarding the coding rates used or a discontinuous/continuous (DTX) operation.

Abstract: A transceiving methodology and concomitant transceiving system wherein high speed, bursty channels are combined with uniform data rate services into a single, interleaved data stream. A system for communicating both a uniform data stream and a bursty data stream over a communication medium includes: (i) a transmitter for combining the uniform data stream and the bursty data stream into a single, interleaved stream, and for propagating the interleaved stream over the medium; and (ii) a receiver for processing the single interleaved stream to separate the uniform data stream and the bursty data stream.

Abstract: A modular approach to the mapping of data in and from a standard SDH/SONET signal is described. A module has interfaces (T0-T8) which allows to connect to it to other of its kind and thereby achieving higher data rates, i.e. access to standard signals of higher levels. By choosing among different interconnection schemes, arrangements comprising a plurality of modules are also able to support concatenated data traffic.

Abstract: A Received Signal Strength Indicator (RSSI) comparison circuit provides relatively error-free operation for radio communication systems using time division duplexing according to variations of received signals. The RSSI comparison circuit includes: a first comparator for receiving a received signal at a first terminal of a first comparator and for receiving a power supply voltage through first and second resistors at a second terminal thereof; a third resistor coupled between an output terminal of the first comparator and a source of the power supply voltage; a capacitor coupled between the output terminal of the first comparator and ground; a second comparator including a first terminal coupled to an output terminal of the first comparator and a second terminal for receiving the power supply voltage through fourth and fifth resistors; and a sixth resistor coupled between an output terminal of the second comparator and the source of the power supply voltage.

Abstract: A multi-class connection admission control (CAC) method that supports cell loss and delay requirements. In this model-based CAC, the source traffic is described in terms of the usage parameter control (UPC) parameters. Through analysis and approximations, simple closed-form methods to calculate the bandwidth required to meet guarantees on quality of service (QoS) are used. In addition to being robust, the CAC achieves a high level of resource utilization and can be easily implemented for real-time admission control.

Abstract: A communication router receives incoming communications and assigns a priority to each, which are then placed in a routing queue in descending order of priority from the head of the queue, to be routed from the head of the queue to selected destinations. The invention is particularly applicable to routing telephone calls in a call center. Destinations, in the call center agent stations arc selected on a basis of agent availability, and an agent status may be available if the agent is involved in a call of lower priority than a call to be routed. In some embodiments displaced calls may be placed back in the routing queue in order of priority. The invention is applicable to routing a wide variety of communications, such a telephone calls, e-mails, video calls, and Internet Protocol calls.

Abstract: An ATM network switch includes a switch fabric (14), and a plurality of slot controllers (11) coupled to the switch fabric. Each slot controller has at least one external data link (12, 13), cell receiving circuitry (21) for receiving ATM cells from the data link and cell transmitting circuitry (22) for transmitting ATM cells outwardly on the data link. The cell transmitting circuitry of each slot controller includes traffic shaping circuitry (23) arranged to set, for each cell presented to the transmitting circuitry, a current onward transmission time where onward transmission at the input rate meets a predetermined flow rate criterion, and a delayed onward transmission time where onward transmission at the current time would cause the traffic on a VC to exceed a predetermined flow rate criterion.

Abstract: The present invention provides for a method and a system for combining into a single set of combined transmit signals (32) multiple sets of transmit signals (30) associated with different carrier bands or channels produced by a plurality of modem frames (12, 14) for increasing the traffic carrying capacity of a communication system without requiring an additional set of antennas. The present invention further provides for the cross frame combining of a plurality of modem frames (102, 104), while maintaining a high output power.

Abstract: The invention relates to a local area network operating in the asynchronous transfer mode comprising a plurality of terminals (1 to 4) which are formed each by a station (5), a radio device (7) for transmitting data between the terminals (1 to 4) and a network interface (6) including a controller (8) at least provided for setting up a connection, and comprising a switch unit (9) for switching cells between radio device (7), station (5) and controller (8). To effect a fast data transmission, the terminals (1 to 4) are provided each for a direct data exchange with another terminal (1 to 4). One terminal (1 to 4) then executes management functions in the network and exchanges data by means of at least one virtual link between a local user and a user of another terminal (1 to 4).

Abstract: A base station transmits, in addition to a pilot channel, signals which are multiplexed with pilot symbols inserted in the respective signals in communication channels. As the transmission of the pilot channel as a reference signal for coherent detection is unnecessary with high power so as to attain high reliability, the pilot channel can be transmitted with low power by means of weight in comparison with the communication channel, so that interference with the communication channel of any other station is reduced. Moreover, accurate coherent detection can be made from the pilot symbol inserted in the communication channel on the mobile station side.

Abstract: A network of ATM routing switches transmits digital signal cells of a first type requiring integrity of transmission and a second type accepting some loss in transmission, each switch has buffer circuitry. a plurality of output ports each having a plurality of queues of cells awaiting output, each output port having control circuitry to provide in an output frame control bits indicating the type of cell, a path identifier and the existence of flow congestion at the routing switch which it outputting the frame, thereby inhibiting transmission of further frames to that location until a frame is received from that location indicating that the congestion is cleared.

Abstract: A multi-channel Automatic Retransmission Query (ARQ) methods transmits data packets from a source to a destination over a communication link that is subdivided into a number of channels. A network using the multi-channel ARQ method sequentially multiplexes the data packets at the source and transmits them over corresponding channels. The network applies a stop-and wait ARQ method on each one of the channels and determines whether the destination has positively acknowledged a previously transmitted data packet. If not, the network retransmits only the data packets that are not positively acknowledged.

Abstract: An apparatus and method using the forward error correction setting to enable simultaneous use of multiple modulation systems on terrestrial distribution networks including cable television systems is described. The system includes a transcoder having a demultiplexer for demultiplexing a forward-error-correction decoded signal into a main data stream with a bit rate suitable for 64-QAM cable transmission and an auxiliary data stream with a bit rate approximately half that of the main data stream. Two of such auxiliary data streams can be combined to generate an output data stream with a bit rate suitable for 64-QAM cable transmission. The system also includes a satellite transmitter which can adjust its convolution coding rate to either 1/2 or 3/4 for 64-QAM and 256-QAM cable channels respectively.

Abstract: A method is disclosed for operating a synchronous Code Division Multiple Access (S-CDMA) radio frequency communication system having a host transceiver unit and a plurality of user transceiver units. The method includes an initial step of defining a super-frame to be comprised of N sequential frames of data. In the preferred embodiment N is equal to three. For a user transceiver unit that obtains access to the host transceiver unit a next step of the method receives frames of data transmitted by the host transceiver unit and initially aligns a receiver timing and a transmitter timing of the user transceiver unit to a super-frame boundary of the received frames. A next step transmits frames of data from the user transceiver unit to the host transceiver unit using the initial timing alignment.

Abstract: A method and arrangement for high-speed data transmission in a TDMA mobile telecommunications system. A high-speed data signal is split into at least two signals of lower speed prior to transmission over a radio path. At least two time slots for each frame are allocated for a mobile station. The time slots from each frame correspond to a number of the signals of lower speed. Modulation and burst building operations are carried out separately for each of the signals of lower speed. Data is transmitted over the radio path between the mobile station and a base station as bursts in a time slot allocated to the mobile station by successive frames, so that each of the signals of lower speed is transmitted in a different one of the time slots.