Abstract: A multiplex communication system is provided with a plurality of multiplex communication equipment connected to each other through an exclusive line. The multiplex communication equipment have a plurality of a structure information for setting multiple bands. The multiple bands are changed over by changing-over the structure information on the basis of a previous-set schedule.

Abstract: A system and method for assigning departure timeslots to arrival data in an ATM switch is described. The departure timeslots are assigned to arrival data when no departure data is pending or when arrival data has a higher priority than pending departure data.

Abstract: An optical multiplexing transmitter having functions for dropping or demultiplexing an optional time slot of a channel of a high-ordered group to optional channels of a low-ordered group channels and adding and multiplexing optional time slots of a low-ordered group to a channel of the high-ordered group in the reversed direction also referred as to an add/drop cross connect function. The optical multiplexing transmitter further, for may loopback optional time slots of the low-ordered group to optional channels of the low-ordered group also referred to as a hair pin cross connecting function.

Abstract: A method for the common transmission of digital source and control data between data sources and sinks connected through data lines, includes transmitting the source and control data in a format prescribing a clocked sequence of individual bit groups of equal length. In each bit group, at least one bit position is reserved for the transmission of unformatted data. The unformatted data are allocated bitwise to the reserved bit positions of successive bit groups and are associated with a certain data source/data sink as a function of the control data.

Abstract: In a video/audio coding and multiplexing method, coding of multimedia data including video data and audio data is implemented as a software program operating on a multitask operating system, and video/audio coded and multiplexed information in which video/audio synchronization is realized in specified time units is obtained. In this method, coded video information and coded audio information are temporarily stored in a video buffer and an audio buffer, respectively. A video/audio synchronization means creates time and information using video block rate information which is created on the basis of the coded video information and stored with the coded video information. According to the time information, a coded video read-out means and a coded audio read-out means read the coded video information and the coded audio information from the respective buffers, and the video/audio synchronization means performs video/audio multiplexing.

Abstract: A paging scheme for a mobile communication system which is capable of suppressing the power consumption of the mobile station by reducing the intermittent ratio while keeping an average time required for the paging shorter than a case of merely increasing a number of time-slots. Each base station transmits a paging channel on which a paging signal for each mobile station is transmitted at intermittent timings, where the paging channel has a data transmission rate higher than a required paging channel rate of the mobile communication system, so as to shorten a transmission time of the paging signal for each mobile station. Then, each mobile station judges a presence or absence of the paging signal for that mobile station by receiving the paging channel at these intermittent timings. The paging channel may have a data transmission rate which is variable.

Abstract: A system for increasing call-handling capacity employs a multi-tier satellite network which includes one or more geosynchronous (GEO) satellites (12) and non-geosynchronous satellites (14). The GEO satellites (12) transfer non delay-sensitive data through the system, while the non-geosynchronous satellites (14) predominantly transfer delay-sensitive data through the system. In a preferred embodiment, a non-geosynchronous satellite (14) receives (102) a data packet, determines (112) whether or not the data packet is delay-sensitive, routes (114) a delay-sensitive data packet through the LEO network, and routes (116) a non delay-sensitive data packet to a GEO satellite (12).

Abstract: A system and method for providing automatic path selection in a fiber-optic transmission network. The system provides efficient utilization of available bandwidth with respect to T1, T3 and STS-3c service requests. A time slot is selected from the available time slots in a maximally utilized and efficient manner in response to a type of service request. The time slot is then assigned to the service request to provide a transmission pathway. In response to a T1 service request, the system finds the most occupied time slot which has an available assignable time slot. If a new unoccupied time slot is required or the request is for a T3 or a STS-3c service, the system selects an unoccupied time slot in accordance with a prioritized order of contiguous unoccupied time slots.

Abstract: Reverse channel circuitry for CDMA based mobile stations which allows carrier phase offsets to be implemented at baseband, thereby eliminating the need for multiple quadrature modulators and excessive D/A converters. In addition, just four baseband filters, two using scaled coefficients and the other two unscaled coefficients, are time multiplexed to produce in-phase and quadrature terms. The invention can lead to a significant savings in hardware and be a valuable tool in implementing multiple code channels with different carrier phase offsets.

Abstract: A data transmission and reception scheme capable of reducing required devices in the data transmission and reception system for an economical advantage, realizing the concurrent data delivery to a plurality of data reception devices, and allowing each one of a plurality of data reception devices to start the data reception at arbitrary timing. In a system for transmitting data from a data transmission device to unspecified many data reception devices that make asynchronous connections, the data transmission device carries out the repetitive transmission by repeating the operations of transmitting a prescribed amount of data to be transmitted by applying a prescribed signal conversion and then pausing the signal conversion processing for a prescribed period of time so as to provide a transmission pause state in the transmission signals which is to be utilized as a reception timing at each data repcetion device.

Abstract: The present invention discloses a method for accessing a cell, and more particularly, to a method for acquiring an initial synchronization using two pilot channels in a CDMA (Code Division Multiple Access) communication system of an asynchronous or quasi-synchronous mode. In accordance with the present invention, a CDMA communication system of an quasi-synchronous mode comprises the steps of synchronizing the mobile station with a cluster pilot, and searching for cell pilots on the basis of the cluster synchronization channel set up by the cluster pilot, and synchronizing the mobile station with the cell pilot having a maximum sensitivity, whereby the mobile station is synchronized with the base station through the cluster pilot and the cell pilot.

Abstract: A method for rate-based flow control protocol on a ring topology network utilizing ethernet packet format and ethernet equipment. The method operates on a communication network communicatively coupling a plurality of network nodes each representing a local area network (LAN). The method for controlling a transmission of a data packets on the ring-topology communication network uses the following steps. A flow path is determined for data packets in the communication network. In another step, limits are calculated for the flow paths of the data packets with respect to each of the network nodes such that the data packets have controlled access to transmit on the communication network. In a final step, the transmission of the data packets on the flow paths is controlled according to the limits and using a packet format and equipment that is directly compatible with the local area network.

Abstract: A network communication device which can discard invalid packets at once is obtained. A plurality of cells received from input lines (IN#1-4) are stored in a shared buffer memory (SBM) and a control portion (CTL) manages tags and addresses. Among the received cells stored in the shared buffer memory (SBM), ones corresponding to discarded management data are not identified. Accordingly, virtually, the received cells in the shared buffer memory (SBM) can be discarded at once.

Abstract: A system and method for network integrity management are provided. A plurality of network elements (108) and software elements (114) are interconnected in a network. Each network element (108) and software element (114) includes an SNMP agent (110, 116) operable to create and maintain a management information base (112, 118) that stores information representing a current status of the associated network element (108) or software element (114). The SNMP agent (110, 116) is further operable to communicate the management information base (112, 118) across the network, and a remote monitor (102) is operable to collect the management information bases (112, 118) communicated by the SNMP agents (110, 116). A management client (120) is operable to connect to the remote monitor (102) and to receive the management information bases (112, 118) collected by the remote monitor (102).

Abstract: An intercom system utilizing peer-to-peer computer network hardware that shares bandwidth between digital audio transport and inter-processor data communications on a common time-division-multiplexed (TDM) parallel bus. The system hardware automates symmetric, simultaneous, variable-length data block transfers among all of the microprocessor- controlled cards in the system. These cards communicate without intervention by or assistance from a central controller or intermediary communications processor, thereby improving system throughput and reliability and decreasing system complexity. An additional benefit of the communication scheme employed herein is that all system cards automatically track changes in the population of other cards in the system. The intercom system described employs a Configuration Card connected to a configuration computer to provides the system supervisor with the ability to quickly configure the system for a particular use without altering the system's hardware configuration.

Abstract: The present invention is directed to method, and associated system, for communicating pre-connect information between a calling endpoint and a called endpoint in an Integrated Services Digital Network (ISDN) system. In accordance with one aspect of the present invention, the method includes the steps of dialing the called endpoint from the calling endpoint, and setting a calling party's subaddress information element to a value that allows the contents of a subaddress information field to be user specified. The method further includes the steps of specifying the contents of the subaddress information field, and transmitting the message of information to the called endpoint, the message of information including the calling party's subaddress information element.

Abstract: Provided is a synchronous stack bus repeater system for a computer network. The system includes a plurality of stacked repeaters, a stack bus linking the repeaters, and a single clock to which the plurality of repeaters is synchronized. The synchronization of the stack bus eliminates several time-consuming communications required between devices operating with different clocks on an asynchronous bus and makes it possible to satisfy the 46 bit time repeater maximum latency required of a Class II repeater according to the IEEE 802.3 standard.

Abstract: A frame synchronization method and apparatus for use in a digital communication system utilizing OFDM method are disclosed. The frame synchronization apparatus comprises a phase calculator for calculating phase values of TPS pilots within a symbol according to in-phase and quadrature-phase channel signals received from a transmitting side; a D-BPSK demodulator for performing D-BPSK demodulation for the phase values of TPS pilots supplied from the phase calculator and outputting the TPS pilots within the demodulated symbol; a control signal generator for comparing the demodulated TPS pilots with each other and outputting a control signal according to the compared result; and frame synchronization unit for confirming a sync word position according to the control signal supplied from the control signal generator and outputting a frame sync signal.

Abstract: One aspect of the invention is a multichannel facility datalink processor. The processor comprises input circuitry operable to receive a first plurality of facility datalink signals. In addition, the multichannel facility datalink processor comprises output circuitry operable to transmit a second plurality of facility datalink signals. A state machine operable to be loaded with a predetermined state also forms a portion of the processor and is further operable to process ones of the first plurality of facility datalink signals and ones of the second plurality of facility datalink signals. The processor further comprises storage circuitry coupled to the state machine which is operable to store state information and facility datalink data for each of the first plurality of facility datalink signals and each of the second plurality of facility datalink signals.

Abstract: A mobile handset is able to receive and transmit to base stations operating in compliance with different standards, for example CDMA, TDMA or AMPS. The mobile handset converts the received signal down to baseband and digitizes only a single channel at a time rather than the whole band. The channel chosen is the biggest of the various transmission systems used. For example, the channel widths for CDMA, TDMA and AMPS are, respectively 1.25 MHz, 30 KHz and 30 KHz. Accordingly to deal with these three systems a 1.25 MHz channel is digitized. Thereafter a digital signal processor determines which of the three systems is being used and appropriate processing and demodulation is carried out.