• Journal of the Korea Institute of Information and Communication Engineering
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• v.4 no.2
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• pp.323-336
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• 2000

In order to achieve the deployment of B-ISDN services in a short time, B-ISDN is being combined with terrestrial ATM network and satellite network which covers a widespread service range. This paper analyzes and investigates several previously existent CDV compensation methods in order to compensate CDV arising from interfacing satellite TDMA and ATM. Specifically to supplement the problems of timestamp and cell number counting methods, new Partial Timestamp mechanism for CDV compensation is proposed. The CDV compensating efficiency of the proposed mechanism is analyzed and evaluated by simulations. It goes to show that Partial timestamps mechanism has many advantages in the aspect of the CDV compensation.

• Journal of Electrical Engineering and information Science
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• v.3 no.1
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• pp.21-27
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• 1998

In this paper we apply routing algorithms in circuit switched networks to B-ISDN networks and investigate the performance. B-ISDN supports a wide range of services with hetrogeneous bandwidth requirements. We assume that the network supports D classes of traffic. It is modeled as a finite D dimensional Markov chain. A call is blocked on arrival if the required bandwidth is not available on the route. The shortest path routing, alternate routing and trunk reservation are considered for performance comparison. We also consider trunk reservation with restricted access control where the network reserves certain amount of bandwidths for one class of traffic that assumes a higher transmission priority. Through the method of successive iterations, we obtain the steady state equilibrium probabilities and call blocking probabilities for dynamic routing. The results can be used to design a B-ISDN network that improves network connection availability and efficiency while simultaneously reducing the network costs.

• Electronics and Telecommunications Trends
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• v.10 no.1 s.35
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• pp.101-111
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• 1995

정보화의 진전으로 정보가 경제활동에 있어서 새로운 추구대상이 되고 있으며, 산업과 사회전반에 걸쳐 정보통신의 이용이 확대되고 있다. 정보통신의 산업적 활용은 생산, 유통방식의 변화와 함께 "산업의 정보화"를 통한 생산성 향상 등 기업활동에 변화를 초래하고 있다. 그 결과 21C 국가경쟁력은 정보통신의 효율적 활용에 의해 좌우될 것이라는 인식하에 각국은 범국가적 차원에서 정보통신의 기반구조로서 B-ISDN구축사업을 실행하고 있으며, 우리나라도 초고속정보통신망의 구축을 위해 2015년까지 총 44.8조원의 투자를 계획하고 있다. 본 고에서는 정보통신의 산업적 역할과 영향분석을 통해 B-ISDN 구축에 따른 산업 및 경제적 성과를 조명해 보고자 한다.

• Information and Communications Magazine
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• v.9 no.9
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• pp.16-23
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• 1992

본 고에서는 21세기 정보화 사회로 발전하기 위한 광대역 통신을 기반으로 하는 정보통신 시스템의 발전 추세를 예측해보고 B-ISDN에서 요구되는 통신망 기술을 서술하였다. 또한 광대역 통신망 기술의 연구와 관련한 HAN/ B-ISDN 연구 개발 사업의 통신망 종합분야를 기술하였다.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.24 no.6B
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• pp.1068-1073
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• 1999

On the emergence of ISDN which has been introduced in the year 1980, various services are supported. This paper presents implementation of ISDN user/network protocol analyzer based on PC-extension card. Firmware and software are loaded on the PC-extension card using PC 05. The performance analysis on D-channel signalling on this system is surveyed. The monitoring results satisfiy with ISDN BRI or PRI interfaces.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.7 no.3
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• pp.461-467
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• 2003

This paper proposes the method of mobility implementation for location searching in the intelligence wireless ATM networks that expand and apply standard broadband signaling capabilities, and analyze the performance based on the numerical algorithm. The existing B-ISDN UNI protocol stack demands the location search mechanism to determine the location of mobile terminal in the wireless ATM networks because it use single protocol through the fixed PTP interface or PTM interface that don't support terminal mobility. The proposed method make possible the dynamic mobility at a part of wireless access by minimizing the signaling load without a falling-off in system performance by using the intelligence network technology according to the expansion of ATM and B-ISDN signaling integration based on the fixed networks. We implemented the performance analysis by MFC modeling based on numerical algorithm, and realized the efficiency of expenses by carrying out the comparative signaling performance evaluation to measure the relative gains of location search service in the intelligence wireless ATM system. The obtained results have the flexibility to operate in the public B-ISDN network environment without a change of existing B-ISDN/ATM NNI signaling reference to support the wireless ATM access system, and can easily expand to correspond to terminal mobility and various multimedia services in the next broadband PCS.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.15 no.5
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• pp.426-433
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• 1990

In this study, we propose a integrated type concentrator and compare with the separated type concentrating method, to accommodate 2B+D ISDN basic access traffic. This system's blocking probabilities are analyzed in terms of each class of bit rate, number of output channels, number of subscriber lines, and offered traffic. The result shows that the proposed method can significantly increase the maximum number of subscriber lines connecting to the system via a T1 carrier, compared with that of the "CCITT proposed" multiplexing scheme or the separated type concentrating method.ng method.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.25 no.9B
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• pp.1618-1634
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• 2000

ISDN, the beginning of broadband and multimedia service, is a digital network that provides integrated end-to-end digital telecommunication services for transmissions of different kinds of information, from voice and facsimiles to data and images. In Japan, Britain and U. S there has been shown the demand of ISDN is considerable and ISDN technology is becoming quite stable. Furthermore,their ISDN service experience helps them to set up and carry out the marketing strategies for Internet access services such as ADSL, Cable Modem and WLL, etc. This paper examines and compares services, charge and discount scheme of ISDN across 14 telecommunication carriers. It can be utilize as a reference for diffusing ISDN as well as developing Internet access services and marketing strategies.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 1998.11a
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• pp.276-281
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• 1998

도입이 가속화되고 있는 초고속통신망에서 데이터통신망 서비스 사업자 시스템에 적용될 번호체계, 상호 접속 기준에 대한 기본적 요건과 기술적 표준/규정 등에 대한 정의가 미비한 실정이다. 초고속 통신망에 접속 및 운용될 데이터 통신망 중에서 초고속망의 번호 계획을 위하여 연동을 고려할 대상 망은 기존의 인터넷망, 패킷 데이터망, 및 ISDN 둥이 있다. 본 고에서는 ITU-T 표준 규격을 따르는 B-ISDN망과 데이터통신망간 연동을 위한 번호 체계에 대하여 논한다. 특히 현재 제정된 ITU-T 표준 규격을 중심으로 현존하는 데이터망, 인터넷망과 초고속망들의 번호 체계를 중심으로 상호 연동 방안을 기술하였다. 또한 초고속망에서의 번호이동성 방안도 검토하였다.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.18 no.2
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• pp.202-206
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• 1993

To secure the 64 kbps clear channel capability in the ISDN, it was decided to convert its North American digital transmission system into the European system especially in DS1 level. But their different companding law became an issue in the process of R&D in the existing time division digital switch such as TDX-1 to incorporate it into the ISDN. TDX-1 has been installed with North American ${\mu}$ companding law and its ISDN capability is under development now. Thus, because of the ${\mu}$ law/A law conversion for the interworking of two different transmission system, it is difficult to maintain the ISDN B channel transparency between TDX-1 and new European system with A companding law. Among some solutions for it, European frame format with ${\mu}$ law companding is recommended. Those problems and solutions are presented in this paper.