Proceedings of 19th Conference on Local Computer Networks最新文献_第3页

Quality and performance of a desktop video conferencing system in the network of interconnected LANs 局域网互联网络中桌面视频会议系统的质量和性能

Proceedings of 19th Conference on Local Computer Networks Pub Date : 1994-10-02 DOI: 10.1109/LCN.1994.386584

J. Harju, Ville Kosonen, Changhong Li

{"title":"Quality and performance of a desktop video conferencing system in the network of interconnected LANs","authors":"J. Harju, Ville Kosonen, Changhong Li","doi":"10.1109/LCN.1994.386584","DOIUrl":"https://doi.org/10.1109/LCN.1994.386584","url":null,"abstract":"We describe the results obtained when using a desktop videoconferencing system for distance learning and, at the same time, doing measurements about its performance. The system hardware is based on a PC with a LAN network controller, and a compression card implementing the CCITT H.261 algorithm. Our network environment consists of a campus network (Ethernets connected with routers and bridges) and a wide area network connection (0.5 Mbit/s frame relay) to another university 150 miles away. In this environment TCP/IP is used as the transport and network protocol suite. The quality of the videoconferencing application is first analysed on a subjective perceptual basis in four different subnetworks. Then, the transmission rate of the application and the number of TCP retransmissions is measured in those subnetworks under varying background traffic load. As one may assume, severe problems with audio appear when the networking environment gets more demanding. With video, the problems are not so evident. Yet, slight degradation of perceptual quality can be observed and related to the increase of load and number of packet switches (routers and frame relay nodes) in the network connection.<<ETX>>","PeriodicalId":270137,"journal":{"name":"Proceedings of 19th Conference on Local Computer Networks","volume":"29 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1994-10-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133489280","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 4

A user solution to internetworking 互联网络的用户解决方案

Proceedings of 19th Conference on Local Computer Networks Pub Date : 1994-10-02 DOI: 10.1109/LCN.1994.386601

Dale Jarman, R. Lee

引用次数: 0

FIFO design for a high-speed network interface FIFO设计为一个高速网络接口

Proceedings of 19th Conference on Local Computer Networks Pub Date : 1994-10-02 DOI: 10.1109/LCN.1994.386621

Shirish S. Sathaye, K. Ramakrishnan, Henry S. Yang

引用次数: 7

Performance evaluation of admission policies in ATM based embedded real-time systems 基于ATM的嵌入式实时系统中准入策略的性能评估

Proceedings of 19th Conference on Local Computer Networks Pub Date : 1994-10-02 DOI: 10.1109/LCN.1994.386607

A. Raha, Nicholas Malcolm, Wei Zhao

{"title":"Performance evaluation of admission policies in ATM based embedded real-time systems","authors":"A. Raha, Nicholas Malcolm, Wei Zhao","doi":"10.1109/LCN.1994.386607","DOIUrl":"https://doi.org/10.1109/LCN.1994.386607","url":null,"abstract":"We study the effect of the output link scheduling discipline of an ATM switch on the ability of an ATM LAN to admit real-time connections. Three output link scheduling policies are studied: first come first served (FCFS), round robin (RR), and packet-by-packet generalized processor sharing (PGPS). We derive connection admission criteria for the three scheduling policies. To evaluate the performance of the three scheduling policies, we introduce the metric of admission probability. The admission probability gives the probability that a randomly chosen set of real-time connections will be admitted into the network. The admission probability allows system designers to study the performance of different scheduling policies over a wide range of network loads. We observe that the performance of the three scheduling policies is sensitive to message deadlines. When the deadlines are small, PGPS outperforms both RR and FCFS, and RR outperforms FCFS. When the deadlines are large, all three scheduling policies perform the same. We also note that although PGPS is better than RR and FCFS most of the time, its improved performance is achieved at the cost of high implementation complexity and run time overheads.<<ETX>>","PeriodicalId":270137,"journal":{"name":"Proceedings of 19th Conference on Local Computer Networks","volume":"141 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1994-10-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126756476","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 8

Limited effects of finite storage on a beneficial file migration policy 有限存储空间对有效文件迁移策略的影响有限

Proceedings of 19th Conference on Local Computer Networks Pub Date : 1994-10-02 DOI: 10.1109/LCN.1994.386576

R. Hurley, J. Black, J. Wong

{"title":"Limited effects of finite storage on a beneficial file migration policy","authors":"R. Hurley, J. Black, J. Wong","doi":"10.1109/LCN.1994.386576","DOIUrl":"https://doi.org/10.1109/LCN.1994.386576","url":null,"abstract":"With the availability of high-speed local-area networks, file migration becomes an attractive option in a distributed file system. However, certain limitations may exist which restrict the movement of files. One such limitation is that storage space is finite and thus, storage sites (file servers) can only store a limited number of files. We use simulation to show that for a homogeneous distributed file system which transfers whole files, migrating files from congested to uncongested storage sites can result in significant performance gains over a system without file migration even in the case of finite storage. Our file migration policy is based on an instantaneous performance gain analysis: a file is migrated only if it leads to a decrease in the overall response time of the file requests currently in the system. Our results indicate that as the system load or coefficient of variation of the file request interarrival times increase, so does the percentage improvement of our file migration policy over a system without file migration. The degradation in performance caused by limited storage space is only significant when the storage restrictions are extreme.<<ETX>>","PeriodicalId":270137,"journal":{"name":"Proceedings of 19th Conference on Local Computer Networks","volume":"17 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1994-10-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126769088","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 7

Interconnection of large-scale LANs via a two-stage switching hub for multimedia applications 通过二级交换集线器实现多媒体应用的大规模局域网互连

Proceedings of 19th Conference on Local Computer Networks Pub Date : 1994-10-02 DOI: 10.1109/LCN.1994.386595

Tzung-Pao Lin, Yao-Tzung Wang, N. Huang

{"title":"Interconnection of large-scale LANs via a two-stage switching hub for multimedia applications","authors":"Tzung-Pao Lin, Yao-Tzung Wang, N. Huang","doi":"10.1109/LCN.1994.386595","DOIUrl":"https://doi.org/10.1109/LCN.1994.386595","url":null,"abstract":"As broadband multimedia applications to the desk top are becoming popular today, the high-speed bandwidth demand from a single user will occupy large shares of the LAN's channel capacity. Therefore, the evolution of LAN technologies has shifted from shared to dedicated media. More and more LANs are being installed and their interconnection will require parallel switching techniques such as a high-speed switching hub. The ATM small cell-size switching approach is intended to accommodate the mixed media such as voice, data and video. To fulfil the switching cost, bandwidth and latency criteria, a two-stage switching hub for LAN interconnection is designed and presented in this paper. The packet switching technique is used in the first stage switching to efficiently interconnect the local LANs. For the second stage design, the ATM cell switching is adopted to accommodate multimedia traffic and internetworking among LANs and WANs. The switching architecture including both the packet and cell switching units is thoroughly described. The message flow and routing mechanism are presented in the paper. This architecture has been proved to have the advantages of very low latency, flexible scalability and easy routing management with two-way learning.<<ETX>>","PeriodicalId":270137,"journal":{"name":"Proceedings of 19th Conference on Local Computer Networks","volume":"5 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1994-10-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134299822","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

An overview of the pipelined common buffer architecture (PCBA) for memory based packet/cell switching systems 基于内存的分组/单元交换系统的流水线通用缓冲体系结构(PCBA)概述

Proceedings of 19th Conference on Local Computer Networks Pub Date : 1994-10-02 DOI: 10.1109/LCN.1994.386591

Shu-Ping Chang, Paul Chang, P. Landsberg

{"title":"An overview of the pipelined common buffer architecture (PCBA) for memory based packet/cell switching systems","authors":"Shu-Ping Chang, Paul Chang, P. Landsberg","doi":"10.1109/LCN.1994.386591","DOIUrl":"https://doi.org/10.1109/LCN.1994.386591","url":null,"abstract":"A pipelined common buffer architecture (PCBA) is proposed for memory based switching systems. Unlike previously proposed shared-memory switching system, the PCBA is suitable for prioritized and multicast (without multiple memory write) traffic for both fixed length and variable length cell/packet. Therefore, switching among ATM traffic and existing LAN can be accomplished. The PCBA can route both fixed-sized cell data and variable-sized packet data. It separates switching system control and packet/cell data streams (the dichotomy) inside the switching system to simplify the design process for identifying VLSI chips implementation. The PCBA also uses pipelining for both system control and data movement, to achieve the highest possible system throughput, i.e. one system buffer per system clock cycle. A system buffer in PCBA has fixed size N/spl times/W bits where N is the number of switch ports and W is the width of data path (number of bits transmitted/received to/from system buffer at one clock cycle by a switch port). Furthermore, the usage of external memory modules for both data and control memory takes full advantage of advances in commercial RAM technology. It can be seen that the PCBA not only can easily expand its queue size for different networking environments, but can also support future traffic types without modification to the architecture.<<ETX>>","PeriodicalId":270137,"journal":{"name":"Proceedings of 19th Conference on Local Computer Networks","volume":"39 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1994-10-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133196124","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 3

Network management platform approach and its application-KView II 网络管理平台方法及其应用kview 2

Proceedings of 19th Conference on Local Computer Networks Pub Date : 1994-10-02 DOI: 10.1109/LCN.1994.386578

Sheng-Ching Jeng, Tien-Wei Chin, Jiun-Liang Lin, Su-Shen Hung, Che-Hsien Tsai

引用次数: 0

Priority communication schemes on local area networks for multimedia traffic 面向多媒体业务的局域网优先通信方案

Proceedings of 19th Conference on Local Computer Networks Pub Date : 1994-10-02 DOI: 10.1109/LCN.1994.386583

A. Elsaadany, M. Singhal, Ming T. Liu

引用次数: 8

Real-time study of a high performance protocol for local/metropolitan ring networks 一种用于本地/城域环网的高性能实时协议研究

Proceedings of 19th Conference on Local Computer Networks Pub Date : 1994-10-02 DOI: 10.1109/LCN.1994.386606

H. Barghi, W. Cronenwett, J. Bredeson

引用次数: 2