• Title, Summary, Keyword: ATM networks

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Implementation of Next Generation DSL Networks (차세대 DSL망의 구현 방안)

  • Park Seung-Chul
    • 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.

A Study on Real-Time Multimedia Service Considering Network Performance in ATM Networks (ATM망에서 Network Performance를 고려한 Real-Time Multimedia Service에 관한 연구)

  • 김영준;이병호
    • Proceedings of the IEEK Conference
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    • pp.91-94
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    • 1998
  • ATM technology is reaching a certain level of maturity that allow for its deployment in local as well as in wide area networks. Concurrently, audiovisual applications are foreseen as one of the major users of such broadband networks. We present in this paper requriement of real-time multimedia service on B-ISDN networks and simulating the transport of MPEG-2 encoded multimedia data over ATM networks using CBR, VBR, ABR of ATM Traffic Service. We compare each delay time considering network performance and propose need for real-time multimedia service.

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A Congestion Control Method for Real-Time Communication Based on ATM Networks

  • Zhang, Lichen
    • Proceedings of the IEEK Conference
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    • pp.1831-1834
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    • 2002
  • In this paper, we present results of a study of congestion control for real-time communication based on ATM networks. In ATM networks, congestion usually results in cell loss. Based on the time limit and priority, the cells that compete for the same output line could be lined according to the character of real-time service. We adopt priority control algorithm for providing different QoS bearer services that can be implemented by using threshold methods at the ATM switching nodes, the cells of different deadline and priority could be deal with according to the necessity. Experiments show the proposed algorithm is effective in the congestion control of ATM real-time networks

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UPC Schemes on the Frame Relay/ATM Interworking in ATM Networks (FR/ATM 연동에서의 UPC 방식)

  • Nam, Yun-Seok;Park, Won-Sik
    • The Transactions of the Korea Information Processing Society
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    • v.6 no.11
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    • pp.3108-3115
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    • 1999
  • Frame relay needs UPC function for the multiplexed logical connections to prevent malicious user traffic from incoming to network, to guarantee the QoS of conformed user traffic, and to protect the normal operation of network system. On the FR/ATM interworking in ATM networks, the UPC may be conducted either by cell-based ATM UPC or frame-based FR UPC. Frames come into and traverse ATm networks by segmentation to ATM cells. Of course, FR QoS should be guaranteed in spite of segmentation and reassembly in ATM networks. In this paper, we compared the QoS of cell-based ATM UPC and frame-based FR UPC in terms of analysis and simulation in case of ingress of excess traffic over negotiated traffic parameters at user-to-network interface. Also we studied frame-based UPC schemes including window-based FR UPC and frame-based VSA which is an ATM UPC algorithm recommended by ITU-T. We described introductions to frame relay including frame structure and FR/ATM interworking, FR traffic parameters and their relationship, comparison of FR QoS between frame-based FR UPC and cell-based ATM UPC, comparison of FR UPC schemes, necessities of egress traffic control, and conclusions.

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Distributed CMIP Design and Performance Analysis in ATM Networks (ATM의 분산 CMIP 설계와 성능 분석)

  • 이정재;정재영
    • Journal of the Korea Society of Computer and Information
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    • v.4 no.4
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    • pp.193-198
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    • 1999
  • According to the spread of Asynchronous Tranfer Mode(ATM) Networks Telecommunication Management Network(TMN) over ATM Networks becomes an important issue. This paper presents with an Performance Analysis and the designs for comparing TCP/IP-Based Internet SNMP(Simple Network Management Protocol) and ITU-T's Distributed CMIP configuration. The experimental results shows that propose method is expected to be effectively used in Distributed Environments such as Internet, ATM. and mobile networks where interoperability and scalability are required.

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ATM cell transmission performance evaluation for co-channel interference in the next generation satellite B-ISDN/ATM networks (차세대 위성 B-ISDN/ATM 망에서 공동채널간섭에 대한 ATM 셀 전송 성능평가)

  • 김병균;김신재;최형진
    • Journal of the Korean Institute of Telematics and Electronics S
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    • v.35S no.3
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    • pp.9-18
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    • 1998
  • For constructionof the next generation satellite B-ISDN/ATM networks considering integration with terrestrial information infrastructure networks, various high speed and wideband satellites with be launched and they will make used of frequency reue techniques for efficient management of limited frequency resource. Therefore, CCI(Co-Channel Interference) inherent in frequency reuse will be a dominant factor in performance degradation of satellite networks. This paper alanyzes the ATM cell transmission performance degradation caused by CCI. The satellite link, including up-link and down-link thermal noise, CCI, and nonlinear satellite transponder, is modeled and interleaving technique is used for compensating the ATM cell transmission performance degradation caused by burst error of satellite link. First, each satellite link subsystem is analyzed in detail and then end-to-end ATM cell transmission performance is evaluated with BER and CLR. Specifically, ATMcell transmission performance degradation caused by CCI is evaluated in detail.

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An Integration Architecture for the ATM Customer Network Management (ATM 고객망관리를 위한 통합 구조에 대한 연구)

  • Jon
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.22 no.4
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    • pp.823-832
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    • 1997
  • As enterprises use ATM networks for their private networks and as these private networks use public ATM networks for wide area communication, the need for the customers to be able to manage both private and public networks. Currently, some standardization work is being done towards providing this capability to customers. In this paper, we propose a new customer network management (CNM) system architecture for the management of both ATM a private network and a public network in a uniform way. The particular features of the proposed architecture lies in the efficient support of the complex hierarchial TMN manager-agent relationships at M3 and M4 interfaces, and the support of SNMP and CMIP integration which is necessary for the implementation of a CNM system. The TMN hierarchical many-to-many manager-agent relationships are realized by the utilization of CORBA-Based SMK (Shared Management Knowledge) implementation. We have also implemented the prototype of a ATM CNM system, and measures the performance for the demonstration of the suitability of the proposed architecture.

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A Scheme to Support IP Mobility over Wireless ATM Networks (무선 ATM망에서 이동성 지원 기법)

  • 문영성;김영욱
    • Journal of KIISE:Information Networking
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    • v.30 no.5
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    • pp.573-580
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    • 2003
  • Increasing user demand for the more bandwidths in wireless communications has motivated a new challenge to utilize the benefits of wireless ATM technology This paper focuses on how to provide IP services to a mobile user over wireless ATM networks. By enhancing the NHRP standard, several shortcomings are improved that are resulted from the naive combinations of Mobile IP over ATM and IP over wireless ATM. This paper presents a mobile location management algorithm that is referred to as the Mobile NHRP scheme. The mobile tracking procedure and the mobile locating procedure are explicitly defined in the proposed scheme. On the locating procedure, the source station may obtain the current location of the destination from NHSs(Next Hop Servers). Therefore the optimized connection can be setup directly. The total costs per move and per setup over ATM/IP overlaid networks are estimated.

Traffic Scheduling using Multi - Thresholds in ATM Networks (ATM망에서 다중 임계를 이용한 트래픽 스케줄링 연구)

  • Kim, Jong-Eun;Ahn, Hyo-Beom;Cho, Kyung-San
    • The Transactions of the Korea Information Processing Society
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    • v.4 no.7
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    • pp.1781-1787
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    • 1997
  • Future high speed networks are expected to use the Asynchronous Transfer Mode(ATM), which provides desired quality of service for the various traffic types(e.g., voice, video and data). Proper traffic control scheme helps ensure efficient and fair operation of networks. In this paper, we analyze various related traffic-control strategies and propose a new traffic control scheme and ATM control architecture with an integrated buffer management method and multi-thresholds in order to solve the problem of each class's cell loss ratio and cell delay in ATM networks. In addition, we evaluate the performance improvement of the proposed traffic control scheme through simulation. As shown in the result, the proposed traffic control scheme improves cell loss ratio in proportion to the buffer size.

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A Traffic Distribution Scheme for Connectionless Data Service using Multi-Path in ATM Networks (ATM 망에서 다중 경로를 이용한 비연결형 트랙픽의 분산 기법)

  • 서원석;오영열;김석규;이배용;이상배
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.21 no.1
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    • pp.103-118
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    • 1996
  • With the advent of B-ISDN based on ATM technonlogy, ther are increasing needs for the interconnection of existing LAN/MAN's through ATM networks. ATM networks, therefore, must provide connectionless service. In this paper, the traffic distributio scheme using multi-path is proposed to support efficient connectionless service in ATM networks. Because the proposed scheme distributed the bursty traffic arrived in the interworking unit (IWU) and the connectionless server (CLS) from LAN-terminals, it alleviates the packet loss ratio caused by buffer overflow at IWU/CLS and is able to use nettowrk resources efficiently according to the network conditions and the amount of the traffic arrived at IWU/CLS. This paper presents the distribution algorithm and the IWU/CLS, CLS-CLS closed-loop rate control scheme.

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