KR960027738A - Apparatus and method for distinguishing OAM cells in ATM virtual path / virtual channel exchange system - Google Patents

Apparatus and method for distinguishing OAM cells in ATM virtual path / virtual channel exchange system Download PDF

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KR960027738A
KR960027738A KR1019940037000A KR19940037000A KR960027738A KR 960027738 A KR960027738 A KR 960027738A KR 1019940037000 A KR1019940037000 A KR 1019940037000A KR 19940037000 A KR19940037000 A KR 19940037000A KR 960027738 A KR960027738 A KR 960027738A
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oam
vpi
signal
registration signal
vci
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KR0132939B1 (en
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전병윤
김도현
이성재
한운영
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양승택
재단법인 한국전자통신연구소
조백제
한국전기통신공사
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00—Data switching networks
    • H04L12/54—Store-and-forward switching systems 
    • H04L12/56—Packet switching systems
    • H04L12/5601—Transfer mode dependent, e.g. ATM
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00—Data switching networks
    • H04L12/54—Store-and-forward switching systems 
    • H04L12/56—Packet switching systems
    • H04L12/5601—Transfer mode dependent, e.g. ATM
    • H04L2012/5625—Operations, administration and maintenance [OAM]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00—Data switching networks
    • H04L12/54—Store-and-forward switching systems 
    • H04L12/56—Packet switching systems
    • H04L12/5601—Transfer mode dependent, e.g. ATM
    • H04L2012/5629—Admission control
    • H04L2012/5631—Resource management and allocation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00—Data switching networks
    • H04L12/54—Store-and-forward switching systems 
    • H04L12/56—Packet switching systems
    • H04L12/5601—Transfer mode dependent, e.g. ATM
    • H04L2012/5638—Services, e.g. multimedia, GOS, QOS
    • H04L2012/5646—Cell characteristics, e.g. loss, delay, jitter, sequence integrity

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Data Exchanges In Wide-Area Networks (AREA)

Abstract

본 발명은 가상채널과 가상경로를 동시에 처리할 수 있는 ATM(Asynchronous Transfer Mode) VP/VC(Virtual Path/Virtual Channel) 교환시스템에서 가상경로와 가상채널의 운용유지보수를 목적으로 사용되는 OAM(Operation, Administration ＆ Maintenance) 셀의 분리를 위한 ATM VP/VC 교환시스템에서의 OAM 셀 구별 장치 및 방법에 관한 것으로, 교환단위인 가상채널과 가상경로의 구별뿐만 아니라 VP/VC 교환기의 역할에 따라 달라지는 F4 및 F5 OAM 셀의 처리를 위하여 VP/VC 교환기의 가상경로상에서의 역할(VP 링크연결점 또는 VPC 종단점)과 가상채널상에서 역할(VC 링크연결점 또는 VCC 종단점)을 구별할 수 있는 효과가 있다.The present invention is OAM (Operation) used for the purpose of operation maintenance of virtual paths and virtual channels in the ATM (Asynchronous Transfer Mode) VP / VC (Virtual Path / Virtual Channel) exchange system that can process the virtual channel and the virtual path at the same time , Administration & Maintenance) A method and apparatus for distinguishing OAM cells in an ATM VP / VC exchange system for cell separation, which is dependent on the role of the VP / VC exchange as well as the distinction between virtual channels and virtual paths. And a role (VP link connection point or VPC end point) on the virtual path of the VP / VC switch for processing the F5 OAM cell and a role (VC link connection point or VCC end point) on the virtual channel.

Description

에이티엠(ATM) 가상경로/가상채널 교환시스템에서의 오에이엠(OAM) 셀 구별 장치 및 방법Apparatus and method for distinguishing OAM cells in ATM virtual path / virtual channel exchange system

본 내용은 요부공개 건이므로 전문내용을 수록하지 않았음Since this is an open matter, no full text was included.

제3도는 본 발명에 따른 OAM 셀 구분을 위한 헤더처리기의 구성도, 제7도는 본 발명의 VPI/VCI 검색수단의 구성 예시도, 제9도는 본 발명의 VPI 검색수단의 구성 예시도.3 is a configuration diagram of a header processor for OAM cell classification according to the present invention, FIG. 7 is a diagram illustrating a configuration of VPI / VCI search means according to the present invention, and FIG. 9 is a diagram illustrating a configuration of VPI search means according to the present invention.

Claims (9)

ATM 가상경로/가상채널 교환시스템에서의 OAM 셀 구별 장치에 있어서, 특정한 VPI에 대하여 VP/VC 교환기가 가상경로를 종단하는지의 여부를 알아내기 위해 VPCE 등록신호를 출력하는 VPI 검색수단; 특정한 VPI/VCI에 대하여 VP/VC 교환기가 가상채널을 종단하는지의 여부를 알아내기 위해 VCCE 등록신호를 출력하는 VPI/VCI 검색수단; F4 OAM 셀을 구별하기 위한 VCI 검색수단; F5 OAM 셀을 구별하기 위한 PTI 검색수단; VCI 검색수단으로부터 세그먼트 F4 OAM 유효신호가 입력될 때 VP 등록신호가 VPI 검색수단에 등록되어 있으면 세그먼트 F4 OAM 종단신호를 출력하고 VPI 검색수단에 등록되어 있지 않으면 세그먼트 F4 OAM 오류신호를 출력하는 세그먼트 F4 OAM 검사수단; VCI 검색수단으로부터 종단대종단 F4 OAM 유효신호가 입력될 때 VPCE 등록신호가 VPI 검색수단에 등록되어 있으면 종단대종단 F4 OAM 종단신호를 출력하고 VPCE 등록신호 및 VP 등록신호가 VPI 검색수단에 등록되어 있지 않으면 종단대종단 F4 OAM 오류신호를 출력하는 종단대종단 F4 OAM 검사수단; PTI 검색수단으로부터 세그먼트 F5 OAM 유효신호가 입력될 때 VC 등록신호가 VPI/VCI 검색수단에 등록되어 있으면 세그먼트 F5 OAM 종단신호를 출력하고 VC 등록신호가 VPI/VCI 검색수단에 등록되어 있지 않고 VP 등록신호가 VPI 검색수단에 등록되어 있지 않으면 세그먼트 F5 OAM 오류신호를 출력하는 세그먼트 F5 OAM 검사수단; PTI 검색수단으로부터 종단대종단 F5 OAM 유효신호가 입력될 때 VCCE 등록신호가 VPI/VCI 검색수단에 등록되어 있으면 종단대종단 F5 OAM 오류신호를 출력하는 종단대종단 F5 OAM 검사수단;을 더 구비하는 것을 특징으로 하는 ATM 가상경로/가상채널 교환시스템에서의 OAM 셀 구별 장치.An apparatus for distinguishing OAM cells in an ATM virtual path / virtual channel switching system, comprising: VPI retrieval means for outputting a VPCE registration signal to determine whether a VP / VC switch terminates a virtual path for a particular VPI; VPI / VCI retrieval means for outputting a VCCE registration signal to determine whether the VP / VC switch terminates the virtual channel for a particular VPI / VCI; VCI retrieving means for distinguishing F4 OAM cells; PTI search means for distinguishing F5 OAM cells; Segment F4 outputting segment F4 OAM termination signal if the VP registration signal is registered in the VPI search means when segment F4 OAM valid signal is input from the VCI search means, and segment F4 outputting the segment F4 OAM error signal if it is not registered in the VPI search means. OAM inspection means; When the end-to-end F4 OAM valid signal is input from the VCI search means, if the VPCE registration signal is registered in the VPI search means, the end-to-end F4 OAM termination signal is output and the VPCE registration signal and the VP registration signal are registered in the VPI search means. End-to-end F4 OAM checking means for outputting an end-to-end F4 OAM error signal if not present; If the VC registration signal is registered in the VPI / VCI search means when the segment F5 OAM valid signal is input from the PTI search means, the segment F5 OAM termination signal is output and the VC registration signal is not registered in the VPI / VCI search means and the VP registration is performed. Segment F5 OAM checking means for outputting a segment F5 OAM error signal if the signal is not registered in the VPI searching means; And an end-to-end F5 OAM checking means for outputting an end-to-end F5 OAM error signal when the VCCE registration signal is registered in the VPI / VCI search means when the end-to-end F5 OAM valid signal is input from the PTI search means. OAM cell discrimination apparatus in an ATM virtual path / virtual channel switching system. 제1항에 있어서, 상기 VPI/VCI 검색수단과 VPI 검색수단으로부터 입력된 신호들(VC 등록신호, VP 등록신호) 모두가 등록되어 있지 않으면 셀을 TMN에 전달하고, 등록된 경우에는 헤더정보선택수단에 의하여 선택된 헤더변환정보(VPI0, VCI0, 라우팅정보)를 VPI/VCI가 분리된 셀에 부가한 다음 종단대종단 F5 OAM 검사수단, 세그먼트 F5 OAM 검사수단, 종단대종단 F4 OAM 검사수단, 그리고 세그먼트 F4 OAM 검사수단으로부터 세그먼트 F4 OAM 종단신호, 종단대종단 F4 OAM 종단신호, 세그먼트 F5 OAM 종단신호, 종단대종단 F5 OAM 종단신호, 세그먼트 F4 OAM 오류신호, 종단대종단 F4 OAM 오류신호, 세그먼트 F5 OAM 오류신호, 그리고 종단대종단 F5 OAM 오류신호가 전달되면 셀을 TMN에 전달하며, 그렇지 않을 경우에는 ATM 스위치로 송신하는 헤더치환수단을 더 구비하는 것을 특징으로 하는 ATM 가상경로/가상채널 교환시스템에서의 OAM 셀 구별 장치.The method according to claim 1, wherein if all of the signals (VC registration signal, VP registration signal) input from the VPI / VCI search means and the VPI search means are not registered, the cell is transmitted to the TMN. The header conversion information (VPI 0 , VCI 0 , routing information) selected by the means is added to the cell where the VPI / VCI is separated, and then end-to-end F5 OAM inspection means, segment F5 OAM inspection means, and end-to-end F4 OAM inspection means. And segment F4 OAM termination signal, end-to-end F4 OAM termination signal, segment F5 OAM termination signal, end-to-end F5 OAM termination signal, segment F4 OAM error signal, end-to-end F4 OAM error signal, When the segment F5 OAM error signal, and the end-to-end F5 OAM error signal is delivered, the cell is transmitted to the TMN, otherwise it is characterized in that it further comprises a header replacement means for transmitting to the ATM switch. OAM Cell Discrimination Device in ATM Virtual Path / Virtual Channel Switching System. ATM 가상경로/가상채널 교환시스템에서의 OAM 셀 구별 장치에 적용되는 OAM 셀 구별방법에 있어서, 셀이 입력되면 VPI, VCI, 그리고 PTI를 분리하여 VPI값은 VPI 검색수단과 VPI/VCI 검색수단에, VCI값은 VCI 검색수단과 VPI/VCI 검색수단에, PTI는 PTI 검색수단에 전달하는 제1단계와, PTI 검색수단에서 종단대종단 F5 OAM 유효신호를 출력하면 VCCE 등록신호, VC 등록신호, VP 등록신호의 존재여부레 따라 종단대종단 F5 OAM 검사수단과 헤더치환수단이 동작하는 제2단계와, PTI 검색수단에서 세그먼트 F5 OAM 유효신호를 출력하면 VC 등록신호와 VP 등록신호의 존재여부에 따라 세그먼트 F5 OAM 검사수단, 세그먼트 F4 OAM 검사수단 및 헤더치환수단이 동작되는 제3단계와, VCI 검색수단에서 종단대종단 F4 OAM 유효신호를 출력하면 VPCE 등록신호와 VP 등록신호의 존재여부에 따라 종단대종단 F4 OAM 검사수단, 헤더치환수단이 동작되는 제4단계와, VCI 검색수단에서 세그먼트 F4 OAM 유효신호를 출력하면 VP 등록신호의 존재여부에 따라 세그먼트 F4 OAM 검사수단과 헤더치환수단이 동작되는 제5단계와, 상기 OAM에 관련된 유효신호들이 발생되지 않을 경우에는 VPI/VCI 검색수단과 VPI 검색수단에서 검색되는 VC 등록신호와 VP 등록신호의 존재여부에 따라 헤더치환수단이 동작되는 제6단계를 포함하는 것을 특징으로 하는 ATM 가상경로/가상채널 교환시스템에서의 OAM 셀 구별 방법.In the OAM cell discrimination method applied to the OAM cell discrimination apparatus in the ATM virtual path / virtual channel switching system, when a cell is input, the VPI, VCI, and PTI are separated and the VPI value is transmitted to the VPI searching means and the VPI / VCI searching means. The VCI value is transmitted to the VCI search means and the VPI / VCI search means, and the PTI is transmitted to the PTI search means, and when the PTI search means outputs the end-to-end F5 OAM valid signal, the VCCE registration signal, the VC registration signal, The second step of the end-to-end F5 OAM inspection means and the header replacement means is operated according to the presence of the VP registration signal, and if the segment F5 OAM valid signal is output from the PTI search means, the presence of the VC registration signal and the VP registration signal is present. According to the third step of operating the segment F5 OAM inspection means, the segment F4 OAM inspection means and the header replacement means, and outputting the end-to-end F4 OAM valid signal from the VCI search means, the existence of the VPCE registration signal and the VP registration signal is determined. Species A fourth step in which the F4 OAM checking means and the header replacing means are operated; and when the segment F4 OAM valid signal is output from the VCI retrieval means, the fifth F4 OAM checking means and the header replacing means are operated according to the presence of the VP registration signal. And a sixth step of operating the header replacement means in response to the presence of the VC registration signal and the VP registration signal searched by the VPI / VCI retrieving means and the VPI retrieving means when no valid signals related to the OAM are generated. OAM cell discrimination method in an ATM virtual path / virtual channel switching system, characterized in that. 제3항에 있어서, 상기 제2단계는, VCCE 등록신호가 VPI/VCI 검색수단에 존재하는 경우 종단대종단 F5 OAM 검사수단에서는 종단대종단 F5 OAM 종단신호를, 헤더치환수단에서는 셀을 TMN으로 전달하는 제7단계와, VCCE 등록신호가 VPI/VCI 검색수단에 존재하지 않고 VC 등록신호가 VPI/VCI 검색수단에 존재하면 헤더치환수단에서는 VC 헤더변환테이블에서 헤더변환정보를 읽어 셀의 헤더변환 후 스위치에 셀을 전달하는 제8단계와, VCCE 등록신호 및 VC 등록신호가 VPI/VCI 검색수단에 존재하지 않고 VP 등록신호가 VPI 검색수단에 존재하면 헤더치환수단에서는 VP 헤더변환테이블에서 헤더변환정보를 읽어 셀의 헤더변환 후 스위치에 셀을 전달하는 제9단계와, VCCE 등록신호, VC 등록신호, VP 등록신호 모두 존재하지 않으면 종단대종단 F5 OAM 검사수단은 종단대종단 F5 OAM 오류신호를, 헤더치환수단에서는 셀을 TMN으로 전달하는 제10단계를 포함하는 것을 특징으로 하는 ATM 가상경로/가상채널 교환시스템에서의 OAM 셀 구별 방법.4. The method of claim 3, wherein in the second step, when the VCCE registration signal is present in the VPI / VCI retrieval unit, the end-to-end F5 OAM termination unit receives the end-to-end F5 OAM termination signal and the header replacement unit converts the cell into a TMN. If the VCCE registration signal does not exist in the VPI / VCI retrieval means and the VC registration signal exists in the VPI / VCI retrieval means, the header replacement means reads the header conversion information from the VC header conversion table and transfers the header of the cell. After the eighth step of delivering the cell to the switch and if the VCCE registration signal and the VC registration signal are not present in the VPI / VCI retrieval means and the VP registration signal is present in the VPI retrieval means, the header replacement means converts the headers from the VP header conversion table. After reading the information and transferring the cell to the switch after header conversion, if the VCCE registration signal, the VC registration signal, and the VP registration signal do not all exist, the end-to-end F5 OAM inspection means ends-to-end F5 OAM error signal. The, header substituted means the OAM cell distinction method in an ATM virtual path / virtual channel switching system comprising: a tenth step of passing the cell in the TMN. 제3항에 있어서, 상기 제3단계는, VC 등록신호가 VPI/VCI 검색수단에 존재하는 경우 세그먼트 F5 OAM 검사수단에서는 세그먼트 F5 OAM 종단신호를, 헤더치환수단에서는 셀을 TMN으로 전달하도록 하는 제7단계와, VC 등록신호가 VPI/VCI 검색수단에 존재하지 않고 VP 등록신호가 VPI 검색수단에 존재하면 헤더치환수단에서는 VP 헤더변환테이블에서 헤더변환정보를 읽어 셀의 헤더변환 후 스위치에 셀을 전달하는 제8단계와, VC 등록신호 및 VP 등록신호가 각각 VPI/VCI 검색수단 및 VPI 검색수단에 존재하지 않으면 세그먼트 F4 OAM 검사수단은 세그먼트 F4 OAM 오류신호를, 헤더치환수단에서는 셀을 TMN으로 전달하는 제9단계를 포함하는 것을 특징으로 하는 ATM 가상경로/가상채널 교환시스템에서의 OAM 셀 구별 방법.4. The method of claim 3, wherein the third step comprises: when the VC registration signal is present in the VPI / VCI retrieval unit, the segment F5 OAM inspection unit transmits the segment F5 OAM termination signal, and the header replacement unit transfers the cell to the TMN. Step 7 and if the VC registration signal is not present in the VPI / VCI retrieval means and the VP registration signal is present in the VPI retrieval means, the header replacement means reads the header conversion information from the VP header conversion table, and then converts the cell to the switch. In the eighth step of transmitting and if the VC registration signal and the VP registration signal are not present in the VPI / VCI retrieving means and the VPI retrieving means, the segment F4 OAM checking means sends the segment F4 OAM error signal, and the header replacing means returns the cell to the TMN. And a ninth step of transmitting the OAM cell in the ATM virtual path / virtual channel switching system. 제3항에 있어서, 상기 제4단계는, VPCE 등록신호가 VPI 검색수단에 존재하는 경우 종단대종단 F4 OAM 검사수단에서는 종단대종단 F4 OAM 종단신호를, 헤더치환수단에서는 셀을 TMN으로 전달하도록 하는 제7단계와, VPCE 등록신호가 VPI 검색수단에 존재하지 않고 VP 등록신호가 VPI 검색수단에 존재하면 헤더치환수단에서는 VP 헤더변환테이블에서 헤더변환정보를 읽어 셀의 헤더변환 후 스위치에 셀을 전달하는 제8단계와, VPCE 등록신호와 VP 등록신호 모두 존재하지 않으면 종단대종단 F4 OAM 검사수단은 종단대종단 F4 OAM 오류신호를, 헤더치환수단에서는 셀을 TMN으로 전달하는 제9단계를 포함하는 것을 특징으로 하는 ATM 가상경로/가상채널 교환시스템에서의 OAM 셀 구별 방법.4. The method of claim 3, wherein in the fourth step, when the VPCE registration signal is present in the VPI retrieval unit, the end-to-end F4 OAM inspection unit transmits the end-to-end F4 OAM termination signal and the header replacement unit transmits the cell to the TMN. In the seventh step, if the VPCE registration signal does not exist in the VPI retrieval unit and the VP registration signal exists in the VPI retrieval unit, the header replacement unit reads the header conversion information from the VP header conversion table, and then converts the cell into the switch. An eighth step of transmitting, and an end-to-end F4 OAM error means, if neither the VPCE registration signal nor the VP registration signal exists, an ninth step of delivering the end-to-end F4 OAM error signal to the TMN in the header replacement means; OAM cell discrimination method in an ATM virtual path / virtual channel switching system, characterized in that. 제3항에 있어서, 상기 제5단계는, VP 등록신호가 VPI 검색수단에 존재하는 경우 세그먼트 F4 OAM 검사수단에서는 세그먼트 F4 OAM 종단신호를, 헤더치환수단에서는 셀을 TMN으로 전달하는 제7단계와, VP 등록신호가 VPI 검색수단에 존재하지 않으면 세그먼트 F4 OAM 감사수단은 세그먼트 F4 OAM 오류신호를, 헤더치환수단에서는 셀을 TMN으로 전달하는 제8단계를 포함하는 것을 특징으로 하는 ATM 가상경로 /가상채널 교환시스템에서의 OAM 셀 구별 방법.4. The method of claim 3, wherein the fifth step comprises: a seventh step of transmitting a segment F4 OAM termination signal by the segment F4 OAM inspection means and a cell by the header replacement means when the VP registration signal exists in the VPI search means; If the VP registration signal is not present in the VPI retrieval means, the segment F4 OAM auditing means includes an eighth step of delivering the segment F4 OAM error signal and the header replacement means to transmit the cell to the TMN. OAM cell discrimination method in channel switching system. 제3항에 있어서, 상기 제6단계는, VC 등록신호가 VPI/VCI 검색수단에 존재하면 헤더치환수단에서는 VC 헤더변환테이블에서 헤더변환정보를 읽어 셀의 헤더변환 후 스위치에 셀을 전달하는 제7단계와, VC 등록신호가 VPI/VCI 검색수단에 존재하지 않고 VP 등록신호가 VPI 검색수단에 존재하면 헤더치환수단에서는 VP 헤더변환테이블에서 헤더변환정보를 읽어 셀의 헤더변환 후 스위치에 셀을 전달하나 두 신호 모두 존재하지 않으면 셀을 TMN으로 전달하는 제8단계를 포함하는 것을 특징으로 하는 ATM 가상경로/가상채널 교환시스템에서의 OAM 셀 구별 방법.4. The method of claim 3, wherein the sixth step comprises: when the VC registration signal is present in the VPI / VCI retrieval means, the header replacement means reads the header conversion information from the VC header conversion table and delivers the cell to the switch after the header conversion of the cell; Step 7 and if the VC registration signal is not present in the VPI / VCI retrieval means and the VP registration signal is present in the VPI retrieval means, the header replacement means reads the header conversion information from the VP header conversion table, and then converts the cell to the switch. A method of distinguishing OAM cells in an ATM virtual path / virtual channel switching system, comprising the step of transmitting the cell to the TMN if both signals are present. 제3항에 있어서, VP/VC 교환기의 가상경로와 가상채널상의 역할을 알아내기 위해 특정한 VPI에 대하여 VP/VC 교환기가 VP 링크연결점이나 VPCE로서 작용하는지 여부를 VPI 검색수단의 VP 등록신호와 VPCE 등록신호로, 특정한 VPI/VCI에 대하여 VP/VC 교환기가 VC 링크연결점이나 VCCE로서 작용하는지 여부를 VPI/VCI 검색수단의 VC 등록신호와 VCCE 등록신호로 판별하기 위해 RAM으로 구성된 VPI 검색수단의 데이타버스내에 VPCE 등록신호를 위한 비트를 할당하거나 CAM으로 구성된 VPI/VCI 검색수단에서 어소시에이티드(associated) 데이타의 비트를 VCCE 등록신호로 할당하는 것을 특징으로 하는 ATM 가상경로/가상채널 교환시스템에서의 OAM 셀 구별 방법.The VP registration signal and the VPCE of the VPI retrieval means according to claim 3, wherein the VP / VC switch acts as a VP link connection point or a VPCE for a specific VPI to determine the virtual path and the role of the virtual channel of the VP / VC exchange. As a registration signal, data of the VPI retrieval means configured with RAM to determine whether the VP / VC switch acts as a VC link connection point or a VCCE for a particular VPI / VCI as the VC registration signal and the VCCE registration signal of the VPI / VCI retrieval means. In an ATM virtual path / virtual channel switching system, a bit is allocated for a VPCE registration signal in a bus or an associated data bit is assigned as a VCCE registration signal in a VPI / VCI retrieval means composed of CAMs. How to distinguish OAM cells. ※ 참고사항 : 최초출원 내용에 의하여 공개하는 것임.※ Note: The disclosure is based on the initial application.
KR1019940037000A 1994-12-23 1994-12-23 Method and apparatus for checking oam cell of virtual KR0132939B1 (en)

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KR100324105B1 (en) * 1999-09-28 2002-02-20 신현우 An electric thermal diffuser unit being appropriated for volatilizing liquid solution including perfume

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100324105B1 (en) * 1999-09-28 2002-02-20 신현우 An electric thermal diffuser unit being appropriated for volatilizing liquid solution including perfume

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