Abstract:
본 발명은 공유 메모리 방식 서비스질 버퍼링 전송 및 교환 시스템에서 서비스질 제어 장치 및 그 방법을 제공하는 데 그 목적이 있다. 본 발명에 따르면, 다음 셀의 저장 번지와, 도착시간을 저장하고 있는 기본 단위가 링크드 리스트 방식으로 연결되어 구성된 다수의 서브큐를 포함하고 있는 공유 저장 수단; 외부로부터 셀이 수신되었을 때에 상기 공유 저장 수단의 비사용번지를 입력받아, 입력받은 비사용번지에 셀을 저장하고, 해당 서브큐의 이전 꼬리번지에 셀을 저장한 번지와 저장 시간을 기록하기 위한 입력 제어 수단; 서비스 받을 번지를 입력받아, 입력받은 번지에 저장된 기본단위에서 셀을 읽어 외부로 출력하고, 입력받은 번지에 저장된 기본단위에서 다음 셀의 저장 번지와, 저장 시간을 읽어 출력하기 위한 출력 제어 수단; 상기 입력 제어 수단에 비사용번지와 해당 서브큐의 꼬리번지를 출력하고, 상기 출력 제어 수단에 입력된 서비스 받을 번지를 출력하며, 상기 출력 제어 수단으로부터 출력되는 셀을 포함하고 있는 기본단위에서 읽어온 다음 셀의 저장 번지와, 저장 시간을 입력받아 저장하며, 서브큐의 길이와 각 서브큐의 머리번지에 저장되어 있는 다음 셀의 도착시간을 출력하기 위한 큐 관리 수단; 및 서비스 받을 번지를 결정하여 상기 큐 관리 수단에 출력하기 위한 우선 순위 결정 수단을 포함하여 이루어진 서비스질 제어 장치가 제공된다.
Abstract:
PURPOSE: The adaptive equalizing device of a frequency area is provided to selectively receive channels so as to remove interference, and to selectively add interference-removed signals so as to decide a symbol value, so that a duplicated variable related to the modulation/demodulation of a DWMT(Discrete Wavelet Multi Tone) can be appropriately supplied and a channel characteristic can be improved. CONSTITUTION: A receiving controller(310) selectively receives channels(1-n) and delivers a filtered symbol to a filter of a next terminal, according to a channel selection signal delivered from external. Filters(321-32n) filter signals delivered from the receiving controller(310) to remove an interference. An output controller(330) selectively adds signals filtered by the filters(321-32n) for outputting, according to an output control signal delivered from external. A symbol value decider(340) compares a preset reference value with an output signal of the output controller(330), to decide a symbol value of a signal output from the output controller(330) according to a compared result. A subtracter(350) subtracts an output signal of the output controller(330) from the symbol value decided by the symbol value decider(340). And an update unit(361-36n) compares a signal received through the receiving controller(310) with an error detected by the subtracter(350), to update a filtering coefficient of the filters(321-32n) according to a compared result.
Abstract:
PURPOSE: A fiber-to-the-user network subscriber interface structure is provided to supply multimedia service as well as existing services, to efficiently utilize network resources, and to construct network subscriber distribution network economically. CONSTITUTION: A HEC examining part(22) examines a HEC(Head Error Check) from a byte stream. A cell border identifying part(21) identifies a cell border through the examined HEC. A downstream reverse-mixture part(23) reversely mixes dispersedly mixed byte stream information of a cell stream and thereafter transmits to a downstream frame processor(30). A BIP(Bit Interleaved Parity) examining part(31) receives the reversely mixed byte stream information for examining BIP. A MUX(32) separates a user cell and a PLOAM(Physical Layer Operation and Maintenance cell) from the examined BIP. A 3 cell FIFO(52) transmits the separated user cell to an ATM process function part. A downstream utopia interface part transmits message information within payload of the separated PLOAM to a message FIFO and transmits network information to a timing controller. A RAU buffer store the number of cells detected a processor of a cell butter by making as RAU message. A upstream utopia interface receives user cell from an ATM layer controller. A three cell FIFO memory stores user slot. A PLOAM buffer stores PLOAM. A RAU buffer stores RAU message. A HEC calculation insertion part(64) inserts calculated HEC of a cell header of the cell. A BIP calculation insertion part(63) receives the calculated HEC for calculating BIP to the byte stream and inserting. A upstream mixture part receives the calculated BIP for mixing the cells. A phone header insertion part adds a phone header to the mixed cells. A parallel/series processor(15) converts the phone cell into series bit stream. A bit delay processor delays the converted stream by bit units. A burst optical transmitter(13) multiplexes the bit-delayed stream with a downstream signal for transmitting to a network interface part.
Abstract:
PURPOSE: A call processing structure of an asynchronous transfer mode processing system is provided to heighten performance of a call processing of a system and a communication between processors and facilitate a performance expansion by minimizing a function for setting up connection of a call for setting up a virtual path and a virtual line for user cell transmission, setting up a connection to perform a communication between processors at a high speed, and load for establishing a connection and a communication between processors. CONSTITUTION: A line matching unit(240) attaches a tag to a cell and transmits it to a destination line matching module of cells by using information included in a header of cells received to perform a line matching function between subscribers or systems. A line matching module includes a plurality of line matching units which are connected in parallel control buses, and a line matching unit controller which recombines or divides control cells separated from a user cell path in the ling matching unit according to an AAL 5 message, controls the plurality of line matching units, and performs a disturbance and performance management function. An ATM switch transmits a cell to the destination line matching module on the basis of the tag information attached at the front end of the cell. A call processor(100) determines a general parameter to connect the transmitted cells which have been separated from the line matching module and generates a control message, in case of a control cell. A high speed serial communication bus(400) serves as a path to transmit the generated control message.
Abstract:
PURPOSE: The cell switching apparatus based on a bus is provided to offer the multimedia service with high quality such as broadcast service and VOD(Video On Demand) service to a subscriber, by suggesting a bus structure without overflow of cell data in case that a lower direction traffic toward the subscriber on a network is faster than an upper direction traffic. CONSTITUTION: An operation and management part(102) monitors the states of a main controller(101) and a bus connection part(103), manages a look-up table for converting a header, performs a control function and sets a priority order of data. The bus connection part(103), connected to the bus, transmits and receives the data. A data bus(104) includes a C-bus(105), a R-bus(106) and a T-bus(107). A M-bus(108) controls the operation and management part(102), the main controller(101) and the bus connection part(103). The main controller(101) generates the signal for the C-bus(105) which synchronizes the data that is transmitted and received from the bus connection part(103).
Abstract:
1. 청구범위에 기재된 발명이 속하는 기술분야 본 발명은 비동기 전송 방식 시스템에서의 수신된 셀이 속한 가상 연결 테이블의 번지를 찾는 테이블 룩업 방법에 관한 것임. 2. 발명이 해결하고자 하는 기술적 과제 본 발명은 가상 채널 식별자 값에 따라 수신된 셀이 속한 가상 연결 테이블의 번지를 찾는 테이블 룩업 방법을 제공하고자 함. 3. 발명의 해결 방법의 요지 본 발명은 교환 시스템에서의 테이블 룩업 방법에 있어서, 오프셋으로 사용할 값, 해쉬 인덱스 값, 및 헤더 값을 지정하는 제 1 단계; 수신된 가상 채널 식별자가 가상 경로 계층용으로 정해진 것인지를 판단하는 제 2 단계; 가상 경로 계층용이면, 가상 경로 전용 영역을, 오프셋으로 사용할 값을 번지로 하여 읽고, 가상 연결 테이블을 찾는 제 3 단계; 및 가상 경로 계층용이 아니면, 가상 경로/가상 채널 공용영역을, 오프셋으로 사용할 값을 번지로 하여 읽고, 해쉬 테이블을 검색하여 가상 연결 테이블을 찾는 제 4 단계를 포함함. 4. 발명의 중요한 용도 본 발명은 테이블 룩업에 이용됨.
Abstract:
PURPOSE: A method of table look up for searching an address of a virtual connection table corresponding to a received cell in an asynchronous transfer mode system is provided so that when a cell is inputted, a VP or VC connection table can be searched speedily by applying simultaneously a Virtual Path (VP) and a Virtual Channel (VC) connections. CONSTITUTION: A method of table look up for searching an address of a virtual connection table corresponding to a received cell includes several steps. A first step is to designate values such as a Base Table Offset (BOFS), a Hash Offset (HOFS) and a header value (401). A second step is to discriminate whether a received Virtual Channel Identifier (VCI) is defined as a Virtual Path (VP) hierarchy (402). If the received Virtual Channel Identifier (VCI) is defined as a Virtual Path (VP) hierarchy, a third step is to read a region for VP by using the address corresponding to the BOFS and to search a VC table (403). If the received Virtual Channel Identifier (VCI) is not defined as a Virtual Path (VP) hierarchy, a fourth step is to read a region for a VP/VC by using the address corresponding to the BOFS and to search a VC table (407).