• Journal of the Korea Institute of Information Security & Cryptology
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• v.6 no.3
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• pp.71-86
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• 1996

In this paper we propose an explicit rate allocation algorithm for ATM(Asynchronous Transfer Mode) Networks using the available bit rate(ABR) class of service and study the performance of this algorithm. We examine the behavior of ABR traffic with the suggested algorithm, and demonstrate that the algorithm is fair and maintains network efficiency with low cell loss rate. The simulation results show substantial improvements in fairness and efficiency over the existing algorithms.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.27 no.11C
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• pp.1171-1177
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• 2002

In this paper, we proposed a high speed IP(Internet Protocol) packet forwarding engine of ATM(Asynchronous Transfer Mode) based label edge routers for POS(Packet over SONET) interface. The forwarding engine uses TCAM(Ternary Content Addressable Memory) for high performance lookup processing of the packet received from POS interface. We have accomplished high speed IP packet forwarding in hardware by implementing the functions of high speed IP header Processing and lookup control into FPGA(Field Programmable Gate Array). The proposed forwarding engine has the functions of label edge routers as the lookup controller supports MPLS(Multiprotocol Label Switching) packet processing functionality.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.25 no.3B
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• pp.487-492
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• 2000

The ABR(available bit rate) service has been developed to support data application over ATM(asynchronous Transfer mode) networks, and TCP is the most widely used transport layer protocol in existing data networks. Thus, the performance improvement of TCP over ABR is an issue of cardinal importance. In this paper, we propose algorithm of the adjustment of congestion window size utilizing RM(resource Management) cell information. The motivation is to use more reliable information in ER(explicit rate) field within RM cell to determine TCP window size. Simulations are performance using the suggested algorithm is improved, as compared to TCP-reno.

• Proceedings of the Korean Information Science Society Conference
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• 2000.10c
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• pp.508-510
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• 2000

본 논문에서는 프레임 릴레이(Frame Relay : FR) 망과 ATM(Asynchronous Transfer Mode) 망이 연동할 때, 분석 대상인 연동장치(InterWorking Unit : IWU) 수신부에서 프레임이 처리되는데 걸리는 지연시간을 분석하였다. ATM과 FR 사이의 데이터 처리속도의 차이로 인하여 연동장치의 버퍼에서 프레임이 기다리게 된다. 이 때 지연시간을 IWU에서 ATM 망에서 들어오는 프레임의 평균값을 구한 다음에 Little's formula를 이용하여 수학적으로 분석하였다. 결과적으로 FR 연결된 수가 증가할수록 연동장치에서 프레임의 지연시간은 지수적으로 증가함을 알 수 있었다. 또한 지연시간을 분석하므로 해서 연동장치에서 timeout의 시간을 결정하여 프레임을 재전송할 수 있는 시간을 결정할 수 있었다.

• Journal of KIISE:Information Networking
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• v.32 no.2
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• pp.236-243
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• 2005

Most of the existing legacy DSL networks, about 80 million lines world-widely, adopted ‘ATM(Asynchronous Transfer Mode) over DSL’protocol architecture for the effective interworking with the ATM-based regional backbone networks and for the effective support of native ATM-based multimedia application services. Recently, however, the regional backbone networks are moving towards Metro Ethernet networks, instead of the ATM networks, and most of the current multimedia applications are If-based, not native ATM-based. These environmental changes push the architecture of DSL networks to be accordingly changed, and the‘Ethernet over DSL’protocol architecture, instead of existing‘ATM over DSL’, is tried to be applied to the implementation of next generation DSL networks such as VDSL(Very high-rate DSL) . In this paper, we propose two different implementation models for next generation DSL networks in Metro Ethernet backbone environments, respectively EA(Ethernet-to-ATM) implementation model and RE(Ethernet-to-Ethernet) implementation model. And, a comparative analysis focused on the performance and the backward compatability with the legacy DSL networks will be presented.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.22 no.9
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• pp.2014-2026
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• 1997

In this paper, the performances of wireless asynchronous transfer mode (ATM) cell transmission in mobile work are analyzed. We adopt 16Star QAM as amodulation technique in wireless channel and considered Reed-Solomon, convolutional, and concatenated coding to improve the error rate performances, and also proposed the Partial Concatenated Coding (PCC) technique as UEP(unequal error protection) code for efficient transmission of ATM cell in the air interface. We consider Doppler's effect, Rician fading, and diversity technique of maximal-ratio combining (MRC) for mobile channel model. For performance measure, we analyze bit error rate, ATM cell loss probability, ATM cell error probability, and network performances of ATM cell transmission delay and throughput. The numerical results show that the adoption of PCC is a prospective way for the evolution of future wireless ATM network on mobile environment.

• ETRI Journal
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• v.14 no.4
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• pp.43-55
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• 1992

본 고는 광대역 ISDN 의 전송방식인 ATM(Asynchronous Transfer Mode) 프로토콜의 설계 및 구현에 대하여 기술하였으며, 설계된 ATM 프로토콜은 그 기능을 검증하기 위하여, 광대역 ISDN 을 통하여 Ethernet LAN간 연결을 지원하는 LAN TA(Terminal Adaptor), DS3 급 CBR(Constant Bit Rate) 비디오 서비스를 위한 비디오 TA에 적용하였다. LAN TA 와 비디오 TA에 적용되는 ATM 프로토콜은 공통으로 사용할 수 있도록 모듈화하여 설계하였으며 물리계층의 전송 매체 부분은 최대 100Mbit/s 까지 전송속도를 수용할 수 있도록 고려하였다.

• Journal of the Korea Society for Simulation
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• v.6 no.2
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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.

• The Magazine of the IEIE
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• v.18 no.12
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• pp.29-38
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• 1991

CCITT에 의해서 표준화 되고 있는 SDH(synchronous digital hierarchy)기본의 광대역 전송방식과 이의 향후 응용 방향에 대해 개관한다. 또한 광대역 전송방식으로서 고려될 수 있는 STM(synchronous transfer mode)망과 ATM(asynchronous transfer mod)망의 구조를 살펴보고 1991년도를 중심으로 일어나고 있는 이들 각각의 국내ㆍ외적인 표준화 동향, 기술개발 현황, 그리고 망구축 동향 등에 대해서 간단히 기술한다.

• Journal of The Institute of Information and Telecommunication Facilities Engineering
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• v.10 no.1
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• pp.14-26
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• 2011

In this paper, we've studied Optical Fiber Subscribe Transmit system. After receiving the ATM cell passing through the FIFO of the Asynchronous Transfer Method from the ATM Layer images to the VC4 signal payload passing through scrambling of the cell payload, HEC computation of the cell and inserting the Idle/Unassigned cell. At this time formed VC4 signal passing through the generating and inserting POH overhead at the same time indicating the start point of the cell by the H4 byte on the VC4 POH. This ATM cell transmits 155Mbps speed changing the optical signal after outputting the frame format at the STM-1 signal generation block through the AUG bus after generating J1 of the VC4 start point at the AU4 pointer generation block.