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千兆比以太网是一种新型的高速网络,在网络管理等方面与现有的以太网技术一致,并采用新技术确保干线速率提高带来网络性能的改善,因此是现有以太网升级的一个最好途径。经过一年多的讨论千兆经以太网即将通过IEEE标准并在骨干网上成为ATM的有力竞争者。 相似文献
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Broadcom(博通)公司在以太网方面的拓展一直是不遗余力,特别是面对中国市场时,以太网产品更是其力推的。近期,Broadcom向中国市场发布了其新一代的多层千兆以太网交换芯片系列StrataXGS III BCM56510。这个系列的芯片针对企业应用,可实现网络准入控制(Network Admission Control,NAC)功能,并支持微软的网络访问保护(Network Access Protection,NAP)策略执行技术。 相似文献
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一种新的基于CNN调度信元的输入缓冲ATM交换结构 总被引:1,自引:0,他引:1
提出了基于细胞神经网络 (CNN)调度信元的输入缓冲ASF方案 ,该方案消除了队头阻塞造成的输入缓冲ASF性能恶化。计算机仿真表明 ,该方案非常有效 ,其性能接近于输出缓冲ASF。 相似文献
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千兆以太网(Gigabit Ethemet)技术目前被广泛应用于局域网中,千兆以太网二层(MAC层)交换芯片是千兆以太网中的关键芯片。文章介绍了一种基于FPGA的8端口千兆以太网交换芯片的实现方案.并且给出了仿真验证结果。结果表明,该设计方案是可行的。 相似文献
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在计算机局域网中,以太网属于中、低速率的网络。目前,在构筑大规模LAN时,100Mbit/s的高速以太网已作为主干网得到普及。从用户角度来看,LAN将从单一的数据通信用的专用网扩展成为同时传送数据,话音和图像的多媒体通信网络。因此,网络必须向提供更高的带宽,更高的带宽利用率及更加灵活的扩展与升级能力方向发展,随着交换式以太网,100Mbit/S高速以太网技术的完善与成熟,网络业界对局域网技术进行了更深入的开发与研究,1996年5月成立的千兆位以太网联盟,帮助IEEE将以太网标准向千兆位速度扩展,推出了作为下一代主干网的… 相似文献
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一种新型的ABR流量控制算法 总被引:1,自引:1,他引:1
提出了一种基于随动系统的ABR流量控制算法,该算法应用了跟踪系统的反馈机制,通过检验缓存中的队列长度来控制源端速率。理论证明,这种算法不仅提高了缓存的利用率,同时大大降低了信元丢失率,以及拥塞产生的可能。仿真结果表明,该算法在实际应用中也是可行的。 相似文献
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根据以太网交换机的测试需求,考虑以太网交换机的技术特点,研究了以太网交换机的性能测试、功能测试、协议一致性测试、和稳定性测试等测试方法。 相似文献
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在无线通信中使用智能天线,在增加网络吞吐量的同时,会产生队列头数据包阻塞问题。提出基于虚拟载波侦听机制的包调度算法,该算法使用方向性网络配置矢量作为包调度的策略,将节点周边区域划分为可用区域和不可用区域,在可用区域范围内选择理想的目的数据包进行发送。计算机仿真和分析进一步表明该包调度算法可以有效解决队列头数据包阻塞问题,从而进一步提高网络吞吐量。 相似文献
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There were several modulation and coding proposals for 10GBASE-T (10 Gigabit Ethernet over copper) systems. One of these is
based on a 10-level pulse amplitude modulation (PAM-10) combined with a 4D (four-dimensional) 8-state trellis code similar
to the one in 1000BASE-T (1000 Megabit Ethernet over copper). The trellis code can be used in a conventional manner as in
1000BASE-T, but the corresponding decoder with a long critical path needs to operate at 833 MHz. It is difficult to meet the
critical path requirements of such a decoder. To solve the problem, two interleaved trellis coded modulation schemes are proposed
in this paper. The inherent decoding speed requirements can be relaxed by factors of 4 and 2, respectively. Due to intersymbol
interference (ISI), the branch metric units in the decoders corresponding to the two interleaved modulation schemes are much
more complicated than those in the conventional decoder. Thus this paper also considers the problem of complexity reduction
of the decoders for the two proposed interleaved modulation schemes, and presents two novel complexity reduction schemes.
Simulation results show that the error-rate performances of the two proposed interleaved schemes are quite close to that of
the conventional scheme. It is also shown that the performance loss due to complexity reduction is negligible.
This research was supported in part by the National Science Foundation by the grant number CCF-0429979.
Yongru Gu received M.S. degree from Duke University, Durham, NC in 2001. Currently, he is working toward the Ph.D. degree at the Department
of Electrical and Computer Engineering, University of Minnesota, Minneapolis. His research interests lie in high-speed low-power
VLSI implementation of digital signal precessing and communication systems.
Keshab K. Parhi (S'85-M'88-SM'91-F'96) received his B.Tech., MSEE, and Ph.D. degrees from the Indian Institute of Technology, Kharagpur,
the University of Pennsylvania, Philadelphia, and the University of California at Berkeley, in 1982, 1984, and 1988, respectively.
He has been with the University of Minnesota, Minneapolis, since 1988, where he is currently Distinguished McKnight University
Professor in the Department of Electrical and Computer Engineering. His research addresses VLSI architecture design and implementation
of physical layer aspects of broadband communications systems. He is currently working on error control coders and cryptography
architectures, high-speed transceivers, and ultra wideband systems. He has published over 400 papers, has authored the text
book VLSI Digital Signal Processing Systems (Wiley, 1999) and coedited the reference book Digital Signal Processing for Multimedia
Systems (Marcel Dekker, 1999).
Dr. Parhi is the recipient of numerous awards including the 2004 F.E. Terman award by the American Society of Engineering
Education, the 2003 IEEE Kiyo Tomiyasu Technical Field Award, the 2001 IEEE W.R.G. Baker prize paper award, and a Golden Jubilee
award from the IEEE Circuits and Systems Society in 1999. He has served on the editorial boards of the IEEE TRANSACTIONS ON
CAS, CAS-II, VLSI Systems, Signal Processing, Signal Processing Letters, and Signal Processing Magazine, and currently serves
as the Editor-in-Chief of the IEEE Trans. on Circuits and Systems - I (2004–2005 term), and serves on the Editorial Board
of the Journal of VLSI Signal Processing. He has served as technical program cochair of the 1995 IEEE VLSI Signal Processing
workshop and the 1996 ASAP conference, and as the general chair of the 2002 IEEE Workshop on Signal Processing Systems. He
was a distinguished lecturer for the IEEE Circuits and Systems society during 1996–1998. 相似文献
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一个利用模糊预测的ATM广域网流量控制算法 总被引:6,自引:0,他引:6
本文提出了一个采用模糊预测的ATM广域网流量控制算法,该算法包括二个部分,即非受控业务量的模糊预测和网络带宽的动态分配,在预测部分,提出了一组模糊判决规则和相关的隶属函数,在带宽分配地对ATM广域网传输时延长的特点,把模糊预测与本文作者在文献「1」中所提出的SER流量控制机制相结合,保证了带分配的公平性和链路的高利用率,仿真结果表明,带宽分配具有公平性,链路利用率达到设计目标、交换节点处缓冲队列很 相似文献
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在EPON系统中,由于接收缓存区深度的限制,OLT和ONU中将经常出现不同程度的帧丢失现象,通过分析可以发现现有的一些机制对解决这个问题不是很有效。提出了一种机制,可以很好地解决帧丢失的问题,并且实现电路很简单。 相似文献
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万兆以太网交换芯片设计技术 总被引:1,自引:0,他引:1
中国以IP为核心的宽带城域网建设正处于高峰阶段,给10G以太网为核心的城域以太网解决方案提供巨大的应用舞台.为了满足中国数据通信市场的需求.中兴通讯研制了10GE以太网产品.文章对这一产品进行了介绍,对其核心芯片--10GE交换芯片进行了分析,给出了芯片的功能、关键技术及芯片功能. 相似文献