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Local Computer Networks, 1993., Proceedings., 18th Conference on

Date 19-22 Sept. 1993

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  • 1993 18th Conference on Local Computer Networks

    Publication Year: 1993
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    Freely Available from IEEE
  • Author index

    Publication Year: 1993 , Page(s): 523 - 524
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    Freely Available from IEEE
  • Integrated bandwidth and congestion management in ATM networks using a simple learning algorithm and a bucket bank

    Publication Year: 1993 , Page(s): 388 - 396
    Cited by:  Patents (2)
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    A simple learning-algorithm-based method for dynamically sharing a pool of bandwidth (BW) by multiple categories of traffic in asynchronous transfer mode (ATM) networks is proposed. For constant bit rate (CBR)-type traffic, only the maximum of the consumable BW is defined, whereas for the other categories, a minimum portion of the BW is guaranteed when they are sufficiently active. The remaining portion of the BW is dynamically shared on the basis of pre-assigned priority level, discard eligibility, and current activity of the cells of a specific category. Functions for (1) fast reward fast penalty (FRFP), (2) fast reward slow penalty (FRSP), (3) slow reward slow penalty (SRSP), and (4) slow reward fast penalty (SRFP) are proposed. Their impact on the achievability of dynamic sharing of BW is investigated View full abstract»

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  • Slotted Aloha protocols for high-speed optical fiber local area networks using WDM passive star topology

    Publication Year: 1993 , Page(s): 284 - 290
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    Five protocols based on slotted Aloha are proposed for very high-speed optical fiber local area networks using wavelength division multiplexing passive star topology. Each station is equipped with a tunable optical transmitter for data channels, a fixed optical transmitter tuned at a separate control channel, a tunable optical receiver and a fixed optical receiver. To obtain high success probability in the transmission of a control packet determining the transmission of its data packet, the control minislot group is introduced. The performances of five protocols are compared under various system parameters. Numerical results show that the protocols presented have better performance than the corresponding protocols View full abstract»

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  • Performance analysis of voice and video services in isochronous LANs and systems

    Publication Year: 1993 , Page(s): 17 - 24
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    The performance of voice and video services is evaluated for isochronous LANs or systems that have time division multiplexing (TDM) channels with fixed bandwidth for real-time traffic. The isochronous bandwidth resources are shared by voice and video traffic which have different bandwidth requirements. The blocking probabilities for voice and video arrivals are obtained analytically for the case where channels are allocated randomly without using a policy. Two policies for bandwidth allocation of voice and video traffics under various traffic load conditions are evaluated. The simulation results show that substantial improvements can be achieved if efficient allocation policies are used View full abstract»

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  • A load balancing multicast tree approach for group-based multimedia applications

    Publication Year: 1993 , Page(s): 327 - 336
    Cited by:  Papers (2)
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    The authors formulate and propose an algorithm for the LBMT (load-balancing multicast tree) problem whose main objective is to accomplish traffic load balance while minimizing the number of multicast trees for a group. In order to fulfill these objectives, the multiple multicast tree concept, whose only disadvantage is the high tree maintenance cost, is introduced. Since the tree maintenance cost is proportional to the number of multicast trees for a multicast group, it is necessary to minimize the number of multicast trees. The authors' LBMT algorithm is based on the minimal Steiner tree approach by using the information on the available capacities of the links. For the algorithm, several link cost functions which take the available capacities on both directions into account are proposed View full abstract»

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  • Guaranteeing synchronous messages with arbitrary deadline constraints in an FDDI network

    Publication Year: 1993 , Page(s): 186 - 195
    Cited by:  Papers (16)  |  Patents (1)
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    Issues related to guaranteeing synchronous messages with arbitrary deadline constraints in a fiber distributed data interface (FDDI) network are addressed. It is shown that several network parameters must be set carefully if message deadlines are to be satisfied. Message deadlines can only be met if sufficient synchronous bandwidth is allocated to each mode. Thus, proper synchronous bandwidth allocation is essential if deadlines are to be guaranteed. The target token rotation time (TTRT) determines both the speed of token circulation and the network utilization available to user applications. TTRT should also be chosen carefully to ensure that the token circulates fast enough while maintaining a high available utilization. Sufficient buffer space must be provided for outgoing messages, otherwise messages could be lost due to buffer overflow. An integrated method for allocating the synchronous bandwidth and selecting TTRT so that the time constraints of synchronous messages with arbitrary deadlines are guaranteed to be met is proposed and analyzed View full abstract»

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  • Distance learning and ATM: A trial at the University of Minnesota

    Publication Year: 1993 , Page(s): 77 - 80
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    A distance learning environment is created which links three remote locations via asynchronous transfer mode (ATM). Continuous bit rate audio and video, variable bit rate image data, and low bit rate background control information are handled simultaneously by high speed ATM links and a set of interconnected ATM central office switches. Digital image servers and display devices are interconnected by a combination of fiber distributed data interface (FDDI) LANs, routers, and switched multi-megabit data service (SMDS) interfaces. Terminal adapters convert SMDS, video, and audio to ATM cells which are multiplexed together over SONET connections. The multiplexed cells are switched to the proper destinations via interconnected ATM switches View full abstract»

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  • A comparison of fibre channel and 802 MAC services

    Publication Year: 1993 , Page(s): 238 - 246
    Cited by:  Patents (13)
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    As the differences between channels and networks narrow, the services and capabilities of channels need to be examined relative to those of networks. A comparison is made between the Fibre Channel protocol and networking protocols. Specific features of the Fibre Channel protocol are compared with those of the Fiber Distributed Data Interface (FDDI) LAN protocol and 802.2-type media access controllers (MACs). Fibre Channel may, in the future, fill a role where it serves as a single communication medium providing both channel and network services View full abstract»

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  • Bandwidth allocation in FDDI-II for isochronous, synchronous and asynchronous traffic

    Publication Year: 1993 , Page(s): 196 - 204
    Cited by:  Papers (2)
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    Fiber distributed data interface-II (FDDI-II) is a high speed LAN for integrated services applications, supporting isochronous, synchronous, and asynchronous traffic. The performance of FDDI-II in handling multiple classes of traffic is examined. The network can be tuned to meet the requirements of isochronous, synchronous, and asychronous traffic using the wideband channels (WBCs), synchronous allocation, and the target token rotation time. Conditions for providing a guaranteed bandwidth for asynchronous traffic while meeting the requirements of isochronous and synchronous classes are presented. Simulation results are used to evaluate the proposed bandwidth allocation method View full abstract»

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  • How the Bernoulli slot occupancy approximation in the node DQDB analytical model influences the throughput-delay performance

    Publication Year: 1993 , Page(s): 120 - 129
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    The effect of the Bernoulli slot occupancy approximation, which is assumed in most distributed queue dual bus (DQDB) analytical models, on the throughput-delay characteristics of DQDB networks is studied. Studies cover a variety of traffic statistics and network configurations. The results reveal that the influences of the Bernoulli slot occupancy approximation are message length, internode distance, and carried network load dependent. In general, for light to medium carried network load and relatively short message length, the analytical model tends to underestimate the mean message delay. The shorter the internode distance is, the smaller are the network load and message length values at which the analytical model starts to overestimate the mean message delay View full abstract»

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  • Experience with the VuNet: A network architecture for a distributed multimedia system

    Publication Year: 1993 , Page(s): 70 - 76
    Cited by:  Papers (3)  |  Patents (2)
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    The VuNet is a gigabit-per-second desk/local-area asynchronous transfer mode (ATM) network built in the context of the ViewStation distributed multimedia project. The ViewStation system takes a software-intensive approach to multimedia where real-time data are processed at the application level and not in specialized hardware. The VuNet hardware is specifically designed to support this software model. The VuNet hardware and is described, and the results of experiments in which video is transported across the system are presented View full abstract»

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  • Configuration and performance issues in the MetaNet design

    Publication Year: 1993 , Page(s): 291 - 299
    Cited by:  Papers (1)
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    Various virtual embedding configurations for the MetaNet architecture are examined. The suggested embedding structures are compared and contrasted, and design parameters and their trade-off are identified. Fairness is used as a mechanism to ensure that the network internally will not be overloaded. Therefore, packets can be sent from source to destination on a route which is close to the shortest path. The routing on the MetaNet is a variant of deflection routing. It makes online routing decisions based on the local flow of traffic (load conditions). MetaNet routing is along a global sense of direction, which guarantees that packets will reach their destinations. This method is called convergence routing. The MetaNet is a LAN/MAN architecture with an "arbitrary topology" (i.e., a switch-based LAN) View full abstract»

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  • MAN/WAN integration-The ATM-to-DQDB case

    Publication Year: 1993 , Page(s): 102 - 109
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    The interworking modes for the interconnection of metropolitan area networks (MANs) and asynchronous transfer mode (ATM)-based broadband-integrated services digital network (ISDN) are studied. The modes considered are “cell-to-slot interworking” and “frame interworking.” The cell-to-slot mode modifies ATM cells to distributed queue dual bus (DQDB) slots and vice versa. The frame mode reassembles cells/slots and modifies AAL frames to DQDB IMPDUs and vice versa. Cell/segment delays for both modes in an interworking unit (IWU) receiving aggregated traffic from B-ISDN and using high priority transmission controlled by the guaranteed bandwidth (GBW) protocol for access to DQDB are compared. The performance results show the advantages of the cell-to-slot mode View full abstract»

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  • Bandwidth balancing of the register insertion bus (RIB) fiber optic local area network

    Publication Year: 1993 , Page(s): 440 - 449
    Cited by:  Papers (1)
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    Register insertion bus (RIB) is a high-speed fiber optic network that uses a folded-bus topology and a medium access interface. The protocol is implemented with stations containing two buffers that allow packets in the network to be temporarily stored to avoid conflicts. Access to the network is gained via active taps at each station. Results show the access scheme to efficiently utilize the network without requiring the overhead associated with a train-type protocol. The protocol is scalable in both transmission speed and packet length. An increase in transmission speed results in a proportional increase in throughput. RIB favors upstream stations at high loads. Thus, extensions to the RIB access scheme that use an increased buffer size and information gathered from the network to provide a fair distributed access scheme for all loads are presented. The control is based on increasing or decreasing the time between transmissions, based on a count of network packet transmissions. Results demonstrate that a fair access to the network is achieved for all loads View full abstract»

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  • Performance evaluation of wireless LANs in the indoor environment

    Publication Year: 1993 , Page(s): 452 - 460
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    The results of a performance evaluation of a wireless LAN (WLLAN) in an indoor environment are presented. The LAN operates in the ISM bands using spread spectrum technology. Hardware specific parameters such as bit error rate vs. signal to noise ratio (BER vs. SNR), maximum transmission rate, and platform software overhead are measured experimentally for a single node. These empirical data, in combination with manufacturer specifications, are then used as a basis for deriving a network simulation model. A ray trace algorithm is used to obtain the indoor channel characteristics for point to point transmissions within a test room. The network simulation uses the measured BER vs. SNR, node and hardware specifications, and the ray trace channel characteristics to model the behavior of a multiple node network in a wireless environment View full abstract»

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  • Experiments with client/server multimedia on token ring

    Publication Year: 1993 , Page(s): 2 - 6
    Cited by:  Papers (2)  |  Patents (1)
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    The capabilities of a 16-Mb/s token ring to support multimedia applications, and simultaneously carry data and multimedia traffic are demonstrated. The token ring's priority mechanism makes it possible to effectively isolate multimedia and data traffic. Bandwidth management is then needed to allocate a guaranteed bandwidth to multimedia traffic. A simple form of bandwidth management limits the number of active multimedia sessions on a token ring segment. With bandwidth management implemented in a multimedia server, client/server multimedia applications on a single token ring segment can become a reality View full abstract»

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  • Analysis of fairness on the Metaring gigabit/s network

    Publication Year: 1993 , Page(s): 300 - 307
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    The Metaring High speed local area network (HSLAN) is based on a full-duplex slotted ring using spatial reuse, which allows throughputs several times higher than the medium capacity. The Metaring access protocol includes a simple and reliable global fairness mechanism which prevents a station from any starvation. By means of simulations, the fairness of the Metaring gigabit/s network is analyzed. Both symmetrical and asymmetrical traffic, as well as underload and overload traffic conditions, are investigated. It is shown that dimensioning the global fairness mechanism parameters strongly influences equity between nodes and the medium utilization ratio View full abstract»

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  • Dynamic congestion control schemes in high-speed multimedia networks

    Publication Year: 1993 , Page(s): 81 - 90
    Cited by:  Papers (2)
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    Dynamic congestion control strategies for supporting real-time multimedia applications in high-speed integrated asynchronous transfer mode (ATM) networks are considered. Several traffic types including voice, video and multimedia data are expected to co-exist in future broadband integrated services digital network (B-ISDN). They are classified according to their distinct needs based on bandwidth, delay or delay-jitter and cell-loss rates. The significant merits that congestion control schemes in high-speed networks should have, in sharp contrast to conventional flow-based schemes, are identified. It is observed that a multilevel congestion control approach is essential to provide quality of service (QOS) guarantees in multimedia networks. A new service mechanism known as fast burst sharing is discussed. It has the ability to transport bursts of certain sessions without fragmenting them, thereby preserving integrity of user talkspurt, often desired in a bursty traffic environment. A number of dynamic cell marking schemes are proposed as effective traffic-compliance testing algorithms View full abstract»

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  • Using the common LAN to introduce ATM connectivity

    Publication Year: 1993 , Page(s): 34 - 43
    Cited by:  Patents (1)
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    A method for using LAN technologies to transport asynchronous transfer mode (ATM) cells is outlined. B-ISDN service requirements are broken into three groups, i.e., high speed media, multimedia interfaces, and service control software. Compression techniques for bandwidth intensive services are discussed. It is argued that these services may be provided using sub-Mb/s ATM links. The ATM concept is shown to be independent of the physical layer, allowing low-speed services to be implemented and utilized before high speed links are in place. An architecture is described where a LAN/fiber gateway switches cells between an external B-ISDN fiber and an in-house Ethernet based ATM network View full abstract»

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  • Optical link bandwidth optimization of the Fiber Channel Networks

    Publication Year: 1993 , Page(s): 256 - 261
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    Optical link bandwidth optimization techniques to optimize the cost-performance of a link are presented. As the data rate increases, fiber attenuation is no longer the limiting factor of the operating distance; instead, the bandwidth becomes the limiting factor. Therefore, it is essential to optimize the bandwidth utilization of a fiber to achieve better cost-performance over copper communications. Since the Fibre Channel standard uses a wide variety of light sources and fiber types, it is critical for the Fibre Channel standard to optimize its operating distances View full abstract»

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  • Assessment and alternative design of FDDI-II MAC protocol

    Publication Year: 1993 , Page(s): 205 - 211
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    Fiber distributed data interface-II (FDDI-II) is a hybrid high speed local area network (HSLAN) providing circuit switched and packet switched services. Although the packet switched service remains connectionless, the circuit switched service is connection-oriented. The weaknesses of the media access control (MAC) protocol of FDDI-II is discussed. A new access scheme, called FDDI-II*, aimed at providing distributed control and access of bandwidth using connectionless service for both packet and isochronous data transmissions is proposed. Simulation results that demonstrate the performance superiority of FDDI*-II to FDDI-II in terms of isochronous data blocking probability and packet data delay are presented View full abstract»

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  • Overload throughput performance of different erasure node protocols for DQDB networks

    Publication Year: 1993 , Page(s): 130 - 138
    Cited by:  Papers (1)
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    Erasure nodes are special devices that have been conceived to improve the system throughput of distributed queue dual bus (DQDB) networks. The authors discuss the overload performance of a network with erasure nodes and the standard bandwidth balancing (BWB) mechanism enabled, when alternative implementation schemes of the erasure node protocol are considered. A numerical method is presented to calculate the maximum throughput in any node of the network, and the conditions for achieving fairness are discussed. The results obtained through the analytical approach are assessed by simulation View full abstract»

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  • Simulation of an ATM-FDDI gateway

    Publication Year: 1993 , Page(s): 403 - 412
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    A detailed simulation model for the design of a high performance asynchronous transfer mode - fiber distributed data interface (ATM-FDDI) gateway based on a new connection-oriented internetwork abstraction called very high speed internetwork (VHSI) is presented. The hierarchical simulation model, constructed using a graphical simulation tool called BONES, serves the dual purpose of functional verification and performance evaluation. The conclusions of this simulation study are presented View full abstract»

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  • Design and implementation of multimedia conference system on broadcast networks

    Publication Year: 1993 , Page(s): 337 - 341
    Cited by:  Papers (6)  |  Patents (2)
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    An implementation of a multimedia conference system with shared white board developed on workstations under UNIX environment is presented. During the implementation, some design issues are encountered, such as how to choose transport protocols, how to resolve problems of delay jitter, how to setup and manage the connections, how to resolve the lip synchronization problems, how to assign priority to packets, and how to choose encoding schemes for audio and video. These design issues are discussed View full abstract»

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