Abstract:
PURPOSE: A method and a system for processing data filtering based on a policy are provided to perform filtering and grouping of data by applying a pattern based on a policy and not simply pattern matching, thereby reflecting the data filtering and grouping requirement of an application service. CONSTITUTION: A pattern handler(171) handles processing functions for applying corresponding patterns to each filtered of event data. If a pattern is inputted, a pattern handler generator(172) generates the pattern handler according to the inputted pattern. A scheduler unit(173) determines the application order of the inputted pattern based on a policy. The scheduler unit controls the driving and termination operations of the pattern handler according to a determined applying order.
Abstract:
PURPOSE: A local line termination device on an ODN(Optical Distribution Network) of ATM is provided to offer an integrated services digital network(IDSN) service as a basic service using an optical cable of one stripe per subscriber and offer video and distribution services. CONSTITUTION: A downstream frame processing part(1) receives ATM cells of a byte or word unit from an external ATM layer processor through a universal test and operations physical interface for ATM(UTOPIA), codes the received ATM cells, and performs a downstream frame insertion function, a bit interleaved parity-8 calculating and inserting function, a scrambling function, a header error control calculating and inserting function, and a parallel-to-serial conversion function. An optical transmitter(2) performs an electric-to-optical conversion operation with regard to serial frame data to output the converted value as a 155.520Mbps or 622.620Mbps optical signal. A controller(3) generates control signals required by downstream and upstream frame processing parts(1,7). A timing generator(4) receives a system clock to generate timing signals needed by each block. A microprocessor(5) performs a media access control protocol. A burst-mode optical receiver(6) restores received data by performing an optical-to-electric conversion operation with regard to an upstream 155Mbps optical signal and extracting a clock signal. A wavelength division multiplexing unit(8) multiplexes a downstream optical signal having 1550mm wavelength and an upstream optical signal having 1310mm wavelength so that the downstream optical signal is transferred to an optical distributor network and the upstream optical signal is transferred to the burst-mode optical receiver(6).
Abstract:
PURPOSE: A device for adopting telephone and ISDN(Integrated Services Digital Network) services in an ATM(Asynchronous Transfer Mode) access network is provided to use a concentration structure in an E1, and to perform an ATM cell after mapping an only service requesting subscriber to an E1 trunk. CONSTITUTION: A POTS(Plain Old Telephone Service) connector(102) connects with a general telephone subscriber, and extracts a telephone signal for transceiving. An ISDN(Integrated Services Digital Network) connector(103) transceives ISDN 2B pulse D data. A PSTN(Public Switched Telephone Network) D-channel controller(104) controls signal channels transmitted from the ISDN connector(103) and the POTS connector(102), and performs a reverse operation thereof. A V5 protocol processor(101) transmits signal data received from the PSTN D-channel controller(104) to a PSTN exchange, and manages subscriber information. A multiplexer(105) performs a multiplexing and a reverse multiplexing for data as one E1 stream. A time slot switch(107) concentrates/switches each time slot of the E1 stream, and performs a reverse operation thereof. An ATM cell converter(109) converts the E1 stream into an ATM cell, and performs a reverse operation thereof. An ATM layer controller(108) performs a connection setup and management of an ATM layer. An SDH(Synchronous Digital Hierarchy) network connector(110) transmits the ATM cell to an access node, and performs a reverse operation thereof. An SDH connector(111) is connected to a physical layer with ONUs(Optical Network Units). An ATM cell converter(113) maps the ATM cell as an E1, and converts E1 data into an ATM. An ATM layer controller(112) performs an ATM connection setup. A PSTN network connector(114) connects with the PSTN exchange.
Abstract:
PURPOSE: An apparatus and a method for measuring dispersion in an optical transmission line are provided to measure the amount and polarity of dispersion without the necessity of using a reference signal, regardless of the type of an optical fiber, the amount of dispersion and the length of an optical transmission line. CONSTITUTION: An apparatus for measuring dispersion in an optical transmission line consists of an optical signal generation part(310), an optical signal modulation part(320), an optical transmission line(330), an amplitude measurement part(340), and a dispersion measurement part(350). The optical signal generation part(310) is a wavelength-variable light source. The optical signal modulation part(320) is comprised of an optical modulator(321) modulating an optical signal, a sine wave signal generator(322) capable of frequency conversion, and a bias voltmeter(323) providing a bias to the optical modulator(321). The amplitude measurement part(340) is composed of an optical detector(341) detecting the optical signal and an amplitude measurer(342) measuring the size of the received optical signal.
Abstract:
PURPOSE: An ATM(Asynchronous Transfer Mode) switch interface device is provided to supply an interface function in order to communicate with a switch having an additional inner switching routing tag. CONSTITUTION: An ATM(Asynchronous Transfer Mode) cell transmitting processor(11) adds a routing tag to an ATM cell received from an ATM network, and transmits the ATM cell to a switch interface transmitting processor(12). The switch interface transmitting processor(12) matches the ATM routing cell to a determined switch format, and interfaces the routing cell. A switch processor(13) retrieves the routing tag of the inner routing cell transmitted from the switch interface transmitting processor(12), and switches the retrieved routing cell. A switch interface receiving processor(14) converts the inner routing cell to match the inner routing cell to a determined routing cell format, and generates an idle routing cell in order to maintain a cell synchronization, then converts the idle routing cell. After converting the idle routing cell, the switch interface receiving processor(14) interfaces the idle routing cell as a determined byte unit. An ATM cell receiving processor(15) matches the transmitted idle routing cell to inner connection setup information, and transmits the idle routing cell to the ATM network.
Abstract:
PURPOSE: A device and a method for controlling the quality of service in a system for buffering transferring and exchanging the quality of service in a shared memory method are provided to service often according to the allotting ratio of bandwidth for each subsidiary queue and to service first of all in case of exceeding a critical value by setting a maximum delaying time per subsidiary queue for each cell passing through each subsidiary queue. CONSTITUTION: The end of service for a subsidiary queue is received for detecting the existence of the subsidiary queue exceeding time. If the time exceeding subsidiary queue is existed, the subsidiary queue is selected for outputting the corresponding cell of the selected subsidiary queue. If the time exceeding subsidiary queue is not existed, the subsidiary queue is selected according to the order stored in a sequence register for port and grade to output the corresponding cell of the selected subsidiary queue.