Abstract:
PURPOSE: An internal distributed node IPC(Inter Processor Communication) method with a function distribution type is provided to transmit a message to an object using an address of a LAN(Local Area Network) in an application program which performs an IPC, classify a corresponding process using a message type, a message identification number, and a destination port number, and exchange the message. CONSTITUTION: An IPCMP(IPC Message Protocol) generates a fundamental IPCMP header of a message using a destination port number, a source port number, and a message type number on the basis of a received IPC message(402). The IPCMP determines whether the message is disassemble according to a size of the message with reference to the generated fundamental IPCMP header, disassembles the message(403), and completes an IPCMP message. An Ethernet header is added to the completed IPCMP message using an Ethernet type number and an Ethernet destination address through a lower driver, and the IPCMP message is transmitted to a line processor node(404). A message received in a receiving message queue is transmitted to an IPCMP layer, and the IPCMP header is checked for checking an error of the message(406). A corresponding socket protocol is called according to a message type and a destination port number, and a reassembly process is performed in case that the message is disassembled(407). An IPC message is transmitted to an application program process using an intrinsic port number and a message type number(408).
Abstract:
PURPOSE: A line interface statistics collecting method in a distributed processing high speed router is provided to quickly and effectively perform a line interface statistics collection request received from an operator terminal and a network management system by using a high speed router including line cards with a control processor, and stably operate the high speed router. CONSTITUTION: A data is initialized to collect a line interface statistics(S301) and comes in a standby state to wait for a statistics collection request from an operator terminal or a network management system(S302). When the line interface statistics collection request is received from the operator terminal(S303), a line card and a port number requested by the operator terminal are analyzed(S304), and a related transmission and reception counter information desired to be collected by the operator terminal is collected from control processors of the obtained line card(S305). The collected counter information is formatted to a form to be outputted to the operator terminal(S306), and the line interface statistics collection result is provided to the operator terminal(S307). When a line interface statistics collection request is received from the network management system, that is, when a message for an MIB(management information base) object data searching request is received(S308), the received message is analyzed and a PDU(Protocol Data Unit) is extracted(S309), and the requested statistics MIB is searched(S310). A related transmission and reception counter information is collected by using the searched information(S311), and the collected related transmission and reception counter information is combined(S312). The combined related transmission and reception counter information is converted into an MIB object information requested by the network management system and a PDU to be used when responding to the network management system is generated(S313). The MIB object data searching result using the generated PDU is provided to the network management system(S314).
Abstract:
본 발명은 SVC(Switched Virtual Connection)를 이용하여 연결 서비스를 제공하는 ATM(Asynchronous Transfer Mode) 기반의 라우터에서 수용할 수 있는 인터넷 주소 기반의 ATM 방화벽 라우터 및 이를 이용한 호 처리 제어 방법에 관한 것이다. 종래의 ATM 기반의 방화벽 시스템은 ATM 셀들을 조합한 후 인증 검사하고 검사결과 인증된 패킷을 재전송하는 방식을 사용하거나, ATM 물리계층에서 ATM 셀들의 흐름마다 인증 검사하는 ATM 셀 레벨 방화벽 방식을 사용한다. 이러한 방식은 하드웨어에 과중한 부하를 주거나 데이터 흐름에 제한을 주게 된다. 본 발명에 따르면, SVC를 이용하여 연결서비스를 제공하는 ATM 망에서 인터넷 서비스를 인증할 수 있도록 ATM 신호메시지 처리블록에서 ATM 호 연결 설정 시 수신된 신호메시지에서 송신지 ATM 주소와 수신지 ATM 주소를 획득하고, 획득된 ATM 주소들은 ATM 주소 해석서버를 이용하여 인터넷 주소를 찾고, 획득된 인터넷 주소를 바탕으로 접근제어 목록 데이터베이스의 목록들을 참조하여 호스트 인증을 처리하고, 인증 허가된 호스트인 경우만 호 연결을 진행하고, 인증이 허가되지 않은 호스트의 경우는 호 해제 과정을 처리한다.
Abstract:
1. 청구범위에 기재된 발명이 속한 기술분야 본 발명은 무선 랜 알에프(Radio Frequency; 이하 'RF'라 함) 프런트엔드 송수신 장치에 관한 것임. 2. 발명이 해결하려고 하는 기술적 과제 본 발명은, 하나의 보드 위에 무선 랜 RF 프런트엔드 송수신 장치를 구현함에 있어서 수신 모드 동작시 송신 기능을 정지시키기 위하여 파워 다운 모드를 이용한 무선 랜 RF 프런트엔드 송수신 장치를 제공하고자 함. 3. 발명의 해결방법의 요지 본 발명은, 무선 랜 RF 프런트엔드 송수신 장치에 있어서, 특정 주파수 대역의 제 1 및 제 2 국부 신호를 발생시키기 위한 국부 신호 발생 수단; 상기 국부 신호 발생 수단으로부터 생성된 제 1 국부 신호를 이용하여 기저대역으로부터 입력된 데이터 신호를 중간 주파수 신호로 상향 변환하기 위한 제 1 상향 변환 수단; 상기 제 1 상향 변환 수단에 의해 상향 변환된 중간 주파수 신호를, 상기 국부 신호 발생 수단으로부터 생성된 제 2 국부 신호와 합성하여 RF 신호로 상향 변환하여 송신하기 위한 제 2 상향 변환 수단; 수신 RF 데이터 신호를, 상기 국부 신호 발생 수단으로부터 생성된 제 2 국부 신호와 합성하여 중간 주파수 신호로 하향 변환하기 위한 제 1 하향 변환 수단; 상기 제 1 하향 변환 수단에서 하향 변환된 중간 주파수 신호를, 상기 국부 신호 발생 수단으로부터 생성된 제 1 국부 신호를 이용하여기저대역의 신호로 하향 변환하기 위한 제 2 하향 변환 수단; 및 안테나를 통한 송/수신 모드를 선택하기 위한 송/수신 모드 선택 수단을 포함함. 4. 발명의 중요한 용도 본 발명은, 무선 랜 RF 시스템 등에 이용됨.
Abstract:
PURPOSE: A dual system between a line matching device and an ATM switching device is provided to accept reliability together with increase by changing a dual operation of ATM switching device into a signal operation selectively. CONSTITUTION: Line matching devices(1000A,1000B) convert data inputted from the exterior to an ATM exchange into an ATM cell and outputs the cell to ATM switching devices(2000A/2000B) through a dual path. The ATM switching devices(2000A/2000B) discriminate whether the cell data inputted from the dual line matching devices(1000A,1000B) is normal and performs an NxN switching about the normally received cell. The line matching devices(1000A,1000B) discriminate whether the mode is a dual mode or an extension mode, if the mode is the dual mode, transmit the same data to the dual ATM switching devices(2000A/2000B) through the dual path. The ATM switching devices(2000A,2000B) discriminate whether the mode is a dual mode or an extension mode, if the mode is the dual mode, select a normal data reception path among data inputted from the dual line switching devices(2000A/2000B) and process the data.
Abstract:
PURPOSE: A metric information collecting method of hierarchical network is provided to provide a high quality path according to a service type in case of a path request between nodes by selecting a metric of priority according to a service type or a service type combination, selecting an uplink with the best metric value selected for the service type or a service type combination, setting the metric information of the selected uplink as metric information for an upper level link. CONSTITUTION: An upper level node determines whether metric information of an internal link is to be expressed independently by service types or to be expressed in a combination form of the service types(S401). If the metric information is to be expressed independently by each service type, the upper level node selects a representative uplink according to the service type from an uplink list managed by the internal link(S402) and sets metric information of the selected uplink as metric information collected according to each service type of the internal link(S403). If the metric information is to be expressed in the combination form of the service types, the upper level node selects a representative uplink according to the service type combination from the uplink list managed by the internal link(S404), and sets the metric information of the selected uplink as metric information collected according to the service type combination of the internal link(S405).
Abstract:
PURPOSE: A radio frequency(RF) power amplifier using a feedback circuit and a method for designing the same are provided, which is designed by finding a peak output power point due to an output power change according to an input power of a whole power amplifier circuit, after stabilizing an unstable amplifier device using the feedback circuit in a radio frequency band. CONSTITUTION: A feedback circuit(201) comprising a resistor and a capacitor is arranged in parallel with an amplifier device in an amplification part, and an input matching circuit(301) and an output matching circuit(303) for matching signals are connected to an input port and an output port of the amplifier device respectively. The amplifier part is divided into the first amplification stage constituted with one amplifier device and one feedback circuit, and the second amplification stage constituted with a plurality of amplifier devices and feedback circuits. The plurality of amplifier devices of the second amplification stage are arranged in parallel. The feedback circuit of the second amplification stage is arranged in two amplifier devices one by one.