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From HiPPI-800 to HiPPI-6400: A changing of the guard and gateway to the future

From HiPPI-800 to HiPPI-6400: A changing of the guard and ga...

引用

The International Conference on Parallel Interconnects, PI

作者： D. Tolmie T.M. Boorman A. DuBois D. DuBois W. Feng I. Philp Advanced Network Research & Development Los Alamos National Laboratory Los Alamos NM USA School of Electrical & Computer Engineering Purdue University West Lafayette IN USA

HiPPI-6400, a high-performance parallel interface running at 6400 Mb/s (800 MB/s), is a networking technology targeted for deployment in a local-area network (LAN) or system-area network (SAN). It is a low-latency, high-bandwidth switch that has the added features of providing flow control and error detection and retransmission in hardware, thus freeing network software from having to implement these functions. Due to the very low overhead of the HiPPI-6400 physical layer and the use of separate control lines, user data rates of HiPPI-6400 are literally 6400 Mb/s or 6.4 Gb/s (eight times the usable bandwidth of Gigabit Ethernet) with an achievable bit-error rate of less than 10/sup 25/. An initial 32-port HiPPI-6400 prototype, running an OS-bypass network protocol called ST between two 32-node SGI Origin 2000s, produced one-way latencies of 7 /spl mu/s and sustained data rates of 3.6 Gb/s (unidirectional) and 6.4 Gb/s (bidirectional). The HiPPI-6400 bandwidth in both cases was limited by the memory architecture of the SGI Origin 2000, not by the network. When running an OS-based protocol such as TCP, the unidirectional bandwidth was 2.2 Gb/s.

关键词： Bandwidth Local area networks Switches Protocols Storage area networks Error correction Hardware Physical layer Ethernet networks Bit error rate

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Investigation of polarization tuning mechanism in fiber ring cavity laser

Investigation of polarization tuning mechanism in fiber ring...

引用

Pacific Rim Conference on Lasers and Electro-Optics (CLEO/Pacific Rim)

作者： Ik-sang Kim Jee-Hyun Lee Chang-Bong Kim Chang-Joon Chae Shin-Ho Choi Department of Computer Electronic and Information Communication Engineering Pai Chai University Taejon South Korea Department of Electrical Electronic and Information Communication Engineering Kongju National University Chungnam South Korea Telecommunication Access Network Laboratory Korea Telecom Daejeon South Korea

Ring cavity lasers employ an Er doped or a semiconductor gain medium including a wavelength selective element for tuning a lasing wavelength. For a wavelength tuner, a tunable optical filter can be realized using a rotatable grating, Fabry-Perot cavity or an acousto-optic element. In the paper, we demonstrate the fiber ring laser tuned by controlling polarization states along the birefringent optical fiber loop. The ring laser consists of a semiconductor optical amplifier, a polarization controller combined with a rotatable intra-cavity polarizer for a wavelength selective element, and a 9:1 coupler. The ring also includes a polarization independent in-line optical isolator for providing unidirectional operation and an attenuator to adjust a loop loss.

关键词： Optical fiber polarization Laser tuning Fiber lasers Ring lasers Semiconductor lasers Optical tuning Optical filters Optical control Optical attenuators Erbium

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The design and implementation of a network management platform for TMN

The design and implementation of a network management platfo...

引用

International Conference on computer Communications and networks (ICCCN)

作者： Dongjin Han Wen-Zhe Cui Youngeun Park Shinkyuk Kang Sunshin An Computer Network Laboratory Department of Electronic Engineering Korea University South Korea

ISBN: (纸本)0818690143

network management systems which administer actual network resources are developed based on a software system called network management platforms. network management platforms provide major functions defined in TMN and interfaces to develop network management systems. Our research designs and implements a network management platform suitable to the TMN environment of today and tomorrow. This platform increases the efficiency in handling management information by completely separating managed object class information from instance information. In addition, the performance of the platform is significantly improved through a multi-structured management information tree (MIT) and a multi-staged arrangement of the execution of common management information services (CMIS). Furthermore, our platform allows a new management information base (MIB) to be added to the managed system in run-time, solving the problem of having to recompile and restart the network management system. In our research, we develop a new concept of class level filtering, which yields relatively high performance as the MIT becomes larger.

关键词： computer network management Environmental management Resource management Software development management Information management Runtime environment Software systems Application software Program processors Filtering

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Cascade recursive least squares with subsection adaptation for AR parameter estimation

Cascade recursive least squares with subsection adaptation f...

引用

1998 23rd IEEE International Conference on Acoustics, Speech and Signal Processing, ICASSP 1998

作者： Zakaria, Gaguk Beex, A.A. Hughes Network Systems Germantown MD 20876 United States Systems Group - DSP Research Laboratory Bradley Department of Electrical and Computer Engineering VIRGINIA TECH Blacksbwrg VA 24061 United States

ISBN: (纸本)0780344286

We propose the adaptive cascade recursive least squares (CRLS-SA) algorithm for the estimation of linear prediction, or AR model, coefficients. The CRLS-SA algorithm features low computational complexity since each section is adapted independently from the other sections. It is shown that the CRLS-SA algorithm can yield AR coefficient estimates closer to the true values, for some known signals, than the widely used autocorrelation method. The CRLS-SA converges faster to the true values of the model, which is critically important for estimation from short data records. While the computational effort of CRLS-SA is a factor of 3 to 4 higher than that for the autocorrelation method, the improvement in performance yields a viable alternative for a number of applications. © 1998 IEEE.

关键词： Autocorrelation

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CDMA dynamic downlink power control

CDMA dynamic downlink power control

引用

IEEE Conference on Vehicular Technology (VTC)

作者： Lei Song J.M. Holtzman Department of Electrical & Computer Engineering Wireless Information Network Laboratory Piscataway NJ USA

In current IS-95 systems, forward link power control is far less powerful than reverse link power control and in some cases, it results in the downlink capacity being more limited than the reverse link. This paper analyzes different algorithms and provides insight into the dynamics of downlink power control. An improved forward link power control approach based on the current one bit per frame feedback is suggested. This algorithm consists of three parts. First, the current mobile frame error rate is estimated based on the history of mobile feedbacks. The next two parts are linearization and a linear system controller. Simulation shows that, compared to a bang-bang control scheme, this algorithm can achieve the same frame error rate for a stationary channel with lower mean power. It also has good transient response for time varying channels. It can provide a good tradeoff between the steady state performance and dynamic response. Thus, the paper presents an algorithm to improve the current IS-95 forward link power control but in a more general sense, it presents a systematic approach to the designing of a power control unit.

关键词： Multiaccess communication Downlink Power control Algorithm design and analysis Feedback Error analysis History Linear systems Control systems Bang-bang control

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Implementation and performance evaluation of ISAC: integrated services Internet with RSVP over ATM shortcuts

Implementation and performance evaluation of ISAC: integrate...

引用

IEEE International Conference on Communications (ICC)

作者： H.K. Chow A. Leon-Garcia Network Architecture Laboratory Department of Electrical & Computer Engineering University of Toronto ONT Canada

This paper proposes an approach to support integrated services Internet with RSVP over ATM shortcuts (ISAC). While similar to other LP switching approaches, our work is different in three major aspects. First, it focuses on supporting the integrated services model whereas other approaches currently support only best effort traffic. Second, our architecture adopts RSVP as the major signaling protocol and eliminates duplication of functionality in the ATM domain. Finally, while heterogeneous multicast has not yet been supported in any other approaches, it is considered in our proposal. Our design strives to achieve three fundamental objectives: (1) ensuring compatibility with existing networking standards, applications and system software, (2) maintaining data path efficiency, and (3) assuring portability for different operating system and switch control protocol. Our proposed architecture has been proven by a prototype implementation. Its operation has been verified by demonstrating a videoconferencing application. Our prototype has also been evaluated by measuring its signaling and control latency as well as the transfer delay of the data path.

关键词： Intserv networks Asynchronous transfer mode Application software Switches Software prototyping Prototypes Delay Web and internet services Traffic control Proposals

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The design and implementation of a high performance management information tree for a TMN platform

The design and implementation of a high performance manageme...

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IEEE Region 10 International Conference TENCON

作者： Dongjin Han Wenzhe Cui Youngeun Park Sunshin An Computer Network Laboratory Department of Electronic Engineering Korea University Seoul South Korea

In telecommunication management network (TMN) systems, a managed object (MO) is an OSI abstract view of a logical or physical system resource to be managed. Instances of MO classes can be thought as logically containing other instances. The full set of MO instances available across a management interface are organized in a management information tree (MIT). Managed objects in an MIT may be accessed either individually or collectively through an object-oriented query facility. The speed of MO selection operation highly affects the overall performance of the network management system. In this paper, we propose an MIT mechanism to reduce the MO selection time. This MIT consists of three kinds of nodes: MO node, MO class node and MO info node. A class level filtering (CLF) mechanism is developed based on the MIT to avoid unnecessary filtering time. After detailed provisions on this MIT, some evaluation results are given, and these results are checked against existing MIT.

关键词： Information management Resource management Telecommunication network management computer network management Filtering Software development management Electronic mail Communication networks Object oriented modeling Open systems

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Packet error rate for burst-error-correcting codes in Rayleigh fading channels

Packet error rate for burst-error-correcting codes in Raylei...

引用

IEEE Conference on Vehicular Technology (VTC)

作者： Jie Lai N.B. Mandayam Wireless Information Network Laboratory (WINLAB)Department of Electrical & Computer Engineering Rutgers University Piscataway NJ USA

In this paper, we estimate the packet error rate for data transmission over Rayleigh fading channels using burst-error correcting codes. For a certain fade margin and Doppler frequency, depending on the packet length and the fade and interfade duration statistics, bit-errors in a packet may occur in one, two or more bursts of different lengths. The packet is then considered to be lost whenever the error pattern in a packet exceeds the burst-error-correcting capability of the code. For a given data rate, these maximum tolerable bursts of errors translate to certain thresholds on the duration of fades. Thus we formulate packet loss as a level crossing problem and study the effect of Doppler frequency, fade margin, and burst error correction coding on packet error rate (PER).

关键词： Error analysis Fading Data communication Rayleigh channels Frequency Interleaved codes Error correction codes Intelligent networks Laboratories computer networks

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Polling strategies for mobile location estimation in a cellular system

Polling strategies for mobile location estimation in a cellu...

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IEEE Conference on Vehicular Technology (VTC)

作者： Pi-Chun Chen J.M. Holtzman Wireless Information Network Laboratory WINLAB Department of Electrical and Computer Engineering Rutgers University Piscataway NJ USA

Several techniques have been introduced to estimate the mobile station (MS) location based on the range measurement data polled from a set of base stations (BSs). This paper considers the case when there are polling rate constraints on how often measurements from BSs can be obtained. Polling strategies are proposed. The difference between the strategies is how distributed in time are the BS pollings. An analytic framework is presented to gain the understanding of estimation accuracy by calculating the CRLB (Cramer-Rao lower bound) on the error of the estimation parameters and further applies the CRLB to estimate the location error by extrapolating ahead when no valid measurements are present. The performance of a least square estimator has been compared against this theoretical lower bound.

关键词： Cellular networks Base stations Accuracy Estimation error Parameter estimation Gain measurement Position measurement Frequency measurement Intelligent networks Lifting equipment

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The prototype of continuous media file system, CrownFS

The prototype of continuous media file system, CrownFS

引用

International Conference on Information networking

作者： Se-Jin Hwang Jin-Uok Kim Myong-Soon Park Oh-Young Kwon Tae-Geun Kim Computer Systems Laboratory Computer Science Department Korea University Seoul South Korea Distributed Computing Laboratory Network Computing Department Systems Engineering Research Institute Daejeon South Korea

ISBN: (纸本)0818672250

Currently, many multimedia or continuous media server system is under development on top of either workstations or high-end PCs clustered with high speed networking facilities. In this paper we introduce Crown, a continuous media server on clustered high performance PCs with Myrinet, fast network switching equipment, and then address CrownFS, a file system on top of Crown, to offer continuous media streams to many subscribers at the same time. For easy and rapid tuning of the performance of CrownFS, we prototyped it. Prototyping requires less efforts and costs than direct implementation. Also, more reliable system optimization is obtainable rather than simulation. By using the prototype, we measured the scalability of CrownFS according to disk access strategies.

关键词： Prototypes File systems Streaming media network servers Personal communication networks Multimedia systems Workstations High-speed networks File servers Costs

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