Abstract: A multi-user demodulator eliminates synchronization problems without interference cancellation. A threshold process is applied to a despread signal to extract each user's signal. The extracted signals are respread, and those respread signals other than a specifier user's signal are subtracted from the received signal to ideally extract the specific user's signal.

Abstract: A circuit for sensing network speed in a test instrument for local area networks (LANs) is provided. After coupling the test instrument to the LAN of unknown speed, a link pulse is found among the twisted-wire pairs so that the test instrument is configured for the transmit and receive pairs. The link pulse is then coupled to a comparator that compares the received voltage against a predetermined reference voltage level to develop a trigger signal. The trigger signal is received by a timer circuit which measures time values from the link pulse. The time values are collected by a microprocessor are then compared against a decision value to reach a decision whether the test instrument is coupled to a link running 10BASE-T protocol, 100BASE-T protocol, or a 10/100 dual-speed device. After the decision has been determined, the appropriate chipset is then powered up and coupled to the LAN, thereby minimizing battery drain and preventing errors from being introduced in the LAN by the test instrument.

Abstract: An implementation method is described that efficiently achieves Quality-of-Service (QoS) criteria in a Media-on-Demand (MOD) server system. A MOD server system comprises a media server connected to a plurality of client stations via a shared transmission medium, such as a LAN network. To guarantee the QoS, the output rate of each data stream (of data requested by a client) needs to be specified individually. The inventive timer interrupt driven method achieves the necessary QoS, while reducing the complexity of conventional systems. In particular, a set of hardware timers is used to control the data rates. Each data request is handled by an individual timer, hence, different data streams may have different data request rates. Such design provides several advantages over other implementations, such as low overhead and high scalability.

Abstract: An ATM reassembly controller is disclosed that optimizes the utilization of host memory space and hardware resources such as I/O bus bandwidth, host memory bandwidth, memory system bandwidth and CPU resources. The system combines, whenever possible, the PDU status, PDU data and pointers to the host memory data buffers into a large burst write to the status queue. In addition, multiple status bundles are packed into a host memory buffer for efficient use of memory. An additional benefit of combining and packing information is that CPU resources are conserved by having combined the information the CPU must access into to a contiguous memory area.

Abstract: An explicit rate algorithm is disclosed for use in an end-to-end closed loop flow control algorithm for an ATM network which carries at least constant bit rate (CBR) traffic, variable bit rate (VBR) traffic and adjustable bit rate (ABR) traffic. The algorithm determines how much additional bandwidth is available for ABR traffic on an output link from a node and produces an explicit rate variable that can be forwarded to a source for the ABR traffic. Both the maximum and minimum bandwidths already reserved for all connections on the output link are determined. A single reserved bandwidth value is chosen within the range defined by the maximum and minimum reserved bandwidth values. The current utilization of the ABR input buffer for the node is also determined. The explicit rate variable is generated as a function of the link capacity, the reserved bandwidth value and the current utilization of the ABR input buffer.

Abstract: A cable telephony system (100) including a plurality of subscriber units (104) connected to a head-end (102) by a cable distribution network (106) in which upstream and downstream data transmissions are sent between subscribers (104) and head-end (102). Both shared and unshared connections are supported within cable telephony system (100). Transmission between a subscriber (104) and head-end (102) may involve both a shared and unshared connection in which unshared connections are employed to provide a higher quality of service when the shared connection is unable to do so.

Abstract: In a case where a signal from a G3FAX terminal is transmitted through an ATM network, the fact that the media is a G3FAX terminal is recognized in a tone detecting section or FAX protocol control section within an ATM exchanger and the data is digitized in and transmitted from the FAX processing section, but in this step a congestion level is identified by a congestion state detecting section according to the traffic data measured in the traffic measuring section as well as in the ATM bus control section and other device congestion data in the network, a transmission rate for G3FAX signal transmission is decided according to a congestion level in the FAX speed control section, and the connection protocol between G3FAX terminals is controlled by the FAX protocol control section to transmit the FAX signals controlling a transmission rate between G3FAX terminals.

Abstract: A scalable bandwidth switch is formed from a smart data crossbar and a plurality of simple data crossbars in parallel. A data block that is inputted into the switch contains a header portion and a payload portion. The data block is multiplexed so that the entire header portion is inputted to a port in the smart data crossbar. The smart data crossbar determines the destination of the data block from the header portion, and transmits this information on a control line. The payload portion is inputted to the port in the smart data crossbar, and ports in the plurality of simple crossbars depending on the bandwidth desired. The control line is coupled to the simple data crossbars and configures the simple data crossbars using the port destination information generated by the smart data crossbar.

Abstract: A subchannel within a CDMA signal is provided together with a system for receiving and decoding this subchannel. A message is transmitted over the subchannel by applying a sequence of phase rotations to the user data. A single subchannel message can be transmitted during each 1.25 ms segment of user data, resulting in a transmission rates of up to 800 messages per second over the subchannel. Each message corresponds to a fixed sequence of phases, called a phase codeword, used to rotate the user data each time that message is sent. When only two phase codewords are used, the effective data rate for the subchannel is 800 bits per second, but higher data rates may be achieved by increasing the number of codewords used by the subchannel. The subchannel may be decoded by correlating the user data with each of the possible phase codewords.