• 전자공학회논문지A
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• 제32A권9호
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• pp.1202-1208
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• 1995

Inter-processor communication is required to manage resources in ATM switching system where processors are distributed. ATM switching system, which was developed in our institute, does't have dedicated communication path for inter-processor communication, but use the ordinary switching network same as user data. Therefore, we should test communication paths and equipments before running various application software programs. In this paper, we propose a method to test communication paths between processors in ATM switching system and describe an implemented program using this method.

• 한국정보처리학회논문지
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• 제3권7호
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• pp.1845-1857
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• 1996

ATM 경보 취합 장치는 $1,024\times1,024$의 대용량 ATM 교환기의 하드웨어 고장 취합 기능을 지원하기 위한 목적으로 8비트 소형 마이크로프로세서 및 EA-232C 통신 방법을 이용하여 AGLA(Alarm Gathering Interface board Assembly)로 부르는 단일 보드로 개발되었고, ATM 교환기를 구성하는 가가 서브시스템 하드웨어 블럭 및 모듈에 대해 온라인 시험을 통하여 성능이 입증되었다. 본 논문은 ATM 교환기의 하드웨어 장에 경보 신호의 관리를 위한 경보 취합 장치의 설계 및 개발에 관하여 기술하였으며 이는 추후 성능이 더욱 우수한 대용량 ATM 교환기의 유지 및 운용 기능을 개발하는데 이용될 수 있다. 아울러 ATM 교환기 경보 취합 비에 대한 향후 연구 항목을 제시하였다.

• 대한전자공학회:학술대회논문집
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• 대한전자공학회 1998년도 추계종합학술대회 논문집
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• pp.229-232
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• 1998

Modern telecommunications are increasingly demanding the addition of complex switching features to switching system software. These improvements also should satisfy customer demands for quick provisioning of new service features. But whenever we have developed the switching system in various types, we met problems that are lack of system engineers and short developments terms. We need new guidelines of software design to meet the demands and overcome our problems. So we propose new software platform, scenario driven call control engine (SDCCE) for ATM switching system software and implement an effective call control software using scenarios for ATM Switching System. A scenario is a set of procedures and supplementary scenarios written in data structure and gives benefits to easy adapt new or modified function by adding a scenario. The goal of SDCCE is to increase reusability and readability of software. Especially, it gives a good software extensibility and maintainability. And when we developed ptmp call processing control software, we could get high productivity by reusing scenarios and procedures of ptp call processing control software. We applied the scenario driven call control software to ATM switching system.

• 한국시뮬레이션학회논문지
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• 제6권2호
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• pp.117-124
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• 1997

A simulation model for the estimation of cutoff connection rate in the asynchronous transfer mode (ATM) switching system under multimedia traffic environments is presented. The simulator is developed by the integration of the AweSim tool with user-written C++ routines that model the internal structures of operational details of the switching system. For the case study, the simulator is applied to the ATM switching system developed by Electronics and Telecommunications Research Institute (ETRI) to compare design alternatives according to the cutoff connection rates.

• 대한산업공학회지
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• 제19권1호
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• pp.47-59
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• 1993

Recently, Broadband ISDN(B-ISDN) has received increased attention as a communication architecture which can support multimedia applications. Also, Asynchronous Transfer Mode(ATM) is considered as a promising technique to transfer and switch various kinds of media, such as telephone speech, data and motion video. Comparisons among a variety of ATM switching systems which have already been proposed will provide quite useful information for the new ATM switching system design. To facilitate the comparison, we introduce the design requirements and classification criteria for the ATM switch, and propose a performance analysis model for the Banyan network which is the basic switching fabric of most multi-stage ATM switching systems. The model is based on the standard discrete-time Markov chain analysis and can be conveniently used for extensive Banyan network analysis. The computational results are also presented.

• 대한전자공학회:학술대회논문집
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• 대한전자공학회 1998년도 추계종합학술대회 논문집
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• pp.277-280
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• 1998

As user's demands for high-speed data traffic are recently increased, ABR services are considered as one of important service requirements in ATM networks. Unfortunately, a number of existing ATM switching systems have structural drawbacks as to support ABR services because these switching systems have been developed to support realtime(rt) services such as CBR and rt-VBR services. To support ABR services in the existing ATM switching systems, new traffic control mechanisms for ABR services are required. This paper proposes a method for supporting ABR services in ATM swithcing systems without back-pressure mechanisms and evaluates the performance of the proposed method using simulation.

• 한국산업정보학회논문지
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• 제4권3호
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• pp.44-51
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• 1999

본 논문에서는 ATM 교환기 TMN EMS의 성능 분석을 위한 큐잉 모델을 제시한다. ATM교환기 관리를 위한 TMN 시스템은 관리자, 대행자, ATM교환기 등이 계층적인 구조로 이루어져 있다. 관리자는 여러개의 대행자와 통신하며, 대행자는 ATM 교환기의 관리 기능을 대행한다. 우리는 EMS를 구성하는 관리자의 용량과 성능을 예측하기 위하여 큐잉 모델을 정의하였다. 이 모델을 통하여 EMS의 평균 서비스 시간과 용량을 예측할 수 있다.

• ETRI Journal
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• 제18권3호
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• pp.107-125
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• 1996

In this paper, we define the general requirements of ATM switching systems such as scalability, distributed fashion, and modularity. Also we propose a practical implementation of a scalable ATM switching system whose capacity can be easily expanded. Firstly, the architecture of the system is discussed with an emphasis on system scalability, modularity of subsystems and the simple control network of the design requirements. Secondly, we suggest the three types of distributed call/connection control schemes that are suitable for our switching system. We also estimate their call processing capacity on the average and make a comparison of them under the various system architectures. Since our scalable switching system can be constructed to perform the call processing functions on the various levels of the system capacity, it has much adaptability at the various evolution phases or regions of the network environment.

• 한국정보처리학회논문지
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• 제3권4호
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• pp.947-960
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• 1996

우수한 성능의 ATM 스위칭 시스템 개발을 위한 주요 목표가 셀 손실, 셀지연 및 처리율의 저하를 최소화하는데 있으며, 이러한 목적에 가장 적합한 ATM스위치 소자가 램덤 액세스 메모리 및 제어 논리에 의해 수행되는 공유 버퍼 메모리 스위치(shared buffer memory switch)이다. 이 스위치는 입력 포트의 수가 증가할 수록 VLSI의 제조가 어렵기 때문에 최근의 소용량 및 대용량의 ATM 스위치는 8$\times$8,600 b/s 또는 16$\times$16,150 Mb/s의 단위 스위치를 사용하여 32$\times$32(4.9 Gb/s), 150Mb/s의 스위치를 구현하는 스위치 모듈 방법을 사용하고 있다. 본 논문에서는 단위 공유 버퍼 메모리 스위치의 버퍼 공유에가 위한 전체 메모리 감소 효과를 만족하는 버퍼 용량을 해석적 으로 평가하고, 트래픽 조건에 따른 셀 손실율을 컴퓨터 시뮬레이션한 결과를 제시 하며 또한, 스위치 모듈 방법을 이용하는 소용량 및 대용량 ATM 스위치 마의 특징을 분석,이 결과를 바탕으로 현재 각국에서 연구중인 32$\times$32, 150Mb/s의 스위치 구조를 제시하며, 궁극적으로 위 주요 목표들을 만족하는 소용량 및 대용량의 ATM 스위칭 시 스템을 위한 고속 스위칭 망 구조를 제시한다.

• ETRI Journal
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• 제17권1호
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• pp.23-36
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• 1995

We present a performance evaluation model of cell reassembly mechanism in an ATM switching system. An ATM switching system may be designed so that communications between processors of its control part can be performed via its switching network rather than a separate inter-processor communications network. In such a system, there should be interface to convert inter-processor communication traffic from message format to cell format and vice versa, that is, mechanisms to perform the segmentation and reassembly sublayer. In this paper, we employ a continuous-time Markov chain for the performance evaluation model of cell reassembly mechanism with individual buffering, judicially defining the states of the mechanism. Performance measures such as message loss probability and average reassembly delay are obtained in closed forms. Some numerical illustrations are given for the performance analysis and dimensioning of the cell reassembly mechanism.