By Topic

Local Computer Networks, 1990. Proceedings., 15th Conference on

Date Sept. 30 1990-Oct. 3 1990

Filter Results

Displaying Results 1 - 25 of 59
  • Signal Shaping for Bit-Interleaved Coded Modulation on the AWGN Channel

    Publication Year: 1990 , Page(s): 1 - 8
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (342 KB)  

    The following topics were dealt with: LANs; integrated services networks; gigabit networks; network performance; internetworking; asynchronous transfer mode (AMT); high performance protocols; FDDI; military/government networks; distributed/real-time networks; and metropolitan area networks View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • The real world of high speed networking: user interfaces

    Publication Year: 1990 , Page(s): 274 - 284
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (720 KB)  

    High-speed data transfer networks are becoming the norm in new ship system designs. The network interfacing situation in present-day and foreseeable ship designs are described and a method of dealing with the user network interfaces is discussed. This discussion and the recommended solution are illustrated by examples of shipboard data transfer networks implemented by Rockwell International Corporation on US and foreign navy ship programs. In the design philosophy used, the network must provide the interface capability for users which do not have a direct network compatible interface. This way, the possible application of the network is expanded, resulting in greater operating benefits to the ship and its mission View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • A method for dynamic bandwidth allocation in the FDDI II MAN

    Publication Year: 1990 , Page(s): 18 - 22
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (332 KB)  

    FDDI II, a proposed standard for metropolitan area networks (MANs) that defines a hybrid protocol providing a mode of operation whereby both FDDI token ring operation and isochronous data transfer are integrated onto the same medium, is considered. A modification is presented of the method of dynamic bandwidth allocation for the FDDI II protocol, and its advantages in terms of bandwidth and simplification of the architecture of nodes in the network are pointed out. In comparison with the standard FDDI II, there is a gain in bandwidth of about 500 kb/s, deriving from simplification of the allocation procedure. This gain can be considered significant if the bandwidth is made totally available for asynchronous services, excepting a small part which has to be used for signaling the modification proposed View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • SAFENET-a Navy approach to computer networking

    Publication Year: 1990 , Page(s): 268 - 273
    Cited by:  Papers (7)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (420 KB)  

    The SAFENET (survivable adaptable fiber optic embedded network) standards which are being developed for use in US Navy computer-based systems, are described. There are two SAFENET standards. SAFENET I is based on the IEEE 802.5 LAN standard, while SAFENET II is based on the fiber distributed data interface (FDDI). The SAFENET physical topology is based on a dual counter-rotating ring architecture which provides many survivability features. The SAFENET program has been successful in defining a set of network profiles which will meet the requirements of Navy shipboard combat systems. These standards provide many advantages over current interconnection methods, including use of fiber optics, system survivability, and use of commercial standards View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • DCP: a fully distributed MAC protocol exploiting the capabilities of polling systems

    Publication Year: 1990 , Page(s): 320 - 326
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (576 KB)  

    A novel media access control (MAC) protocol named distributed-control polling (DCP) is described and analyzed. It has been designed to bring together the most interesting features of distributed-control MAC protocols and centralized token-passing MAC protocols. From the fully distributed MAC protocols, DCP acquires the capability to guarantee both a complete utilization of the medium capacity and an access delay of only a few slots at light loads. From the centralized token-passing MAC protocols, DCP inherits a more predictable and fair behavior at heavy loads. The basic ideas of the proposal are: a cycle for acquiring transmission rights and a balancing function between reservations and empty slots. The analysis shows that DCP inherits a more predictable and fair behavior at heavy loads. The analysis shows that, at heavy loads, DCP approaches a polling system with G-limited service and zero reply interval. At light loads DCP behavior is close to that of the distributed queue dual bus protocol View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Ada-based real-time network environment

    Publication Year: 1990 , Page(s): 327 - 333
    Cited by:  Patents (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (532 KB)  

    The design of communications architecture to support Ada-based, real-time, distributed processing systems is described. An implementation of this architecture compatible with the open systems interconnection (OSI) seven-layer reference model is discussed. The foundation Ada real-time network environment (FARNE) is designed and implemented to provide a standard network communications interface to the distributed Ada applications such as those found in tactical systems. FARNE is also designed to support the low latency communication requirements commonly associated with the embedded/tactical systems. The development of FARNE has evolved through several iterations. It currently supports both Unix environment and the embedded processors. FARNE has been tested using optical and nonoptical media. The design and implementation of the FARNE are presented. Key conclusions drawn from results of extensive performance tests and plans for future implementations and enhancements are discussed View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • LAN with collision avoidance: switch implementation and simulation study

    Publication Year: 1990 , Page(s): 84 - 92
    Cited by:  Papers (2)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (616 KB)  

    Presents a design of a collision avoidance switch for the collision avoidance multiple broadcast (CAMB) tree using transistor-transistor logic (TTL) devices. A simulation study exploring the performance of the broadcast star network in both synchronous and asynchronous operations is also presented. Simulation results show that the slotted broadcast star achieves better performance than the unslotted broadcast star, especially when the traffic load is heavy View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • An FDDI bridge for the high-speed multimedia backbone LAN

    Publication Year: 1990 , Page(s): 399 - 404
    Cited by:  Papers (2)  |  Patents (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (448 KB)  

    An architecture for a high-performance bridge that interconnects the fiber distributed data interface (FDDI) ring and the asynchronous transfer mode (ATM) technology based high-speed multimedia backbone LAN (MBLAN) is proposed. This bridge architecture enables the FDDI bridge to learn the source terminal address efficiently by selecting the error-free cell in which the source terminal address is contained, instead of receiving the whole FDDI frame. The fast filtering-database access technique, which applies a multiple hashing algorithm, has high flexibility: that is, both the entry search speed and an effective number of entries in the entry table can be adapted to the requirements of an application by changing the maximum number of hashing times. Both the proposed architecture and the fast filtering-database access technique can be applied to any bridges, the media access method of which handles a fixed-length packet. The MBLAN provides data transmission, as well as voice and video transmission, and is under development View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • An evaluation of IEEE 802 protocols and FDDI in real-time distributed systems

    Publication Year: 1990 , Page(s): 334 - 342
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (660 KB)  

    An overview is provided of each of the alternate computer networking standards, specifically the IEEE 802 protocols and fiber distributed data interface (FDDI), which can be used effectively in real-time distributed systems. An analysis is given to provide a comparison of their relative strengths and weaknesses in supporting real-time distributed systems. A model is developed to provide the means to investigate the performance of each individual standard in terms of the number of messages that are transmitted successfully and the number of messages that cannot be transmitted prior to their deadlines. Fine tuning of the network parameters is discussed as well as the conditions under which each individual standard operates most efficiently View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Transient performance of a CSMA system under temporary overload conditions

    Publication Year: 1990 , Page(s): 93 - 101
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (336 KB)  

    Effects of impulsive arrivals of packets on the performance of carrier-sense multiple-access (CSMA) protocols are studied. A deterministic dynamic system is proposed to approximate the imbedded Markovian chain model of the CSMA system. Based on this approximation, the probability of overloading of the CSMA system due to impulsive input can be estimated, and the trajectory of the system states can be calculated. For engineering application purposes, a relaxation time is defined. Simulations are carried out which support the above-mentioned approaches View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Performance of the Xpress transfer protocol in an Ethernet environment

    Publication Year: 1990 , Page(s): 292 - 300
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (556 KB)  

    A simulation analysis is presented of the performance of the Xpress transfer protocol (XTP), a high-speed protocol intended for fiber distributed data interface (FDDI) or Ethernet environments. The local area network simulation facility (LANSF) is modified to support virtual circuit simulation, and then used to obtain the XTP performance statistics. The chosen simulation LAN environment is Ethernet. The analysis of XTP shows that it can provide high throughput to transport users for bulk data movement operations such as file transfer. Its bandwidth for short transfers is limited by the necessity of carrying the overhead of packet headers, packet trailers, and acknowledgment packets. However, it is not worse than most other protocols in this respect View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Performance evaluation of FDDI

    Publication Year: 1990 , Page(s): 380 - 387
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (336 KB)  

    Using simulation, it is shown that two changes to the fiber distributed data interface (FDDI) protocol suggested by K.C. Sevcik and M.J. Johnson (1987) will simplify the protocol and improve the performance of synchronous traffic by reducing its mean latency. The first change requires that an asynchronous frame must be able to be sent in its entirety in the time remaining before the token rotation timer expires. The second change causes the token rotation timer to be reset to zero on every arrival, including late ones, thereby discarding token lateness instead of accumulating it View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • What the future holds for the local computing network: the next 15 years from a management perspective

    Publication Year: 1990 , Page(s): 2 - 4
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (260 KB)  

    It is argued that over the next 15 years, there should be a quantum increase in the amount of computing power delivered to the user. This paper will be derived from the network to which these devices are connected. While all of this will be of interest to the technologist, there is no focus being given to the application of the power of the local computer network (LCN) to the needs of the users. The LCN is then examined from the viewpoint of what is necessary if the LCN in particular, and computing in general, is to achieve its full capability as a tool for users View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Practical XNS internetworking at BLS

    Publication Year: 1990 , Page(s): 132 - 136
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (412 KB)  

    Both the positive and negative sides of a 3Com-based Xerox network system (XNS) are illustrated using US Bureau of Labor Statistics (BLS) experience with this type of implementation. A historical perspective of the BLS LAN, the rationale behind using XNS and 3Plus, the topology of the BLS internetwork, and its main design philosophy are discussed. A review of the LAN services that the BLS internetworks is given, with emphasis on the causes of partial disruptions and their effect on the primary services. The results show that increased reliance on PC and LAN platforms requires developers to regard bullet proofing as an ongoing priority. Debugging in a large complex internet requires both breadth and depth of knowledge. The complexity of the environment must not be underestimated View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • ATM adaptation layer protocols and IEEE LAN interconnection

    Publication Year: 1990 , Page(s): 200 - 206
    Cited by:  Papers (3)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (556 KB)  

    The asynchronous transfer mode (ATM) adaptation layer provides functions for mapping source traffic into ATM cells as required in recent standardization work for packet switched integrated broadband networks. Functions, services, and protocols suitable for signaling and other packet mode traffic are studied. The resulting protocol stacks are critically examined for two important and differing applications: signaling in broadband ISDN and the IEEE 802.3-5 series of standards for LAN interconnection. The emphasis is on the second case, which is currently considered as an imminent application area for broadband communication networks View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Unisys SAFENET data transfer system (layers 1-4)

    Publication Year: 1990 , Page(s): 343 - 350
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (544 KB)  

    The Unisys fiber optic data transfer system (DTS), which is a compatible implementation of the lower four layers of the US Navy SAFENET standard, is described. SAFENET (survivable, adaptable, fiber optic, embedded network) is a real-time information transfer system. It combines standard LAN protocols with widely accepted ISO OSI (open systems interconnection) protocols and a fiber-optic transmission system to: (1) provide an open system environment which enhances interoperability and communicability; (2) provide improved connectivity and flexibility; and (3) allow for graceful evolution to fully distributed system architectures View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • High performance internetworking protocol

    Publication Year: 1990 , Page(s): 172 - 179
    Cited by:  Papers (3)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (740 KB)  

    The use of parallelism for protocol processing in a parallel architecture of an internetworking unit is presented. This architecture consists of pipelines and arrays of processors and supports multiple memory concepts (local and global memory). A high-performance parallel implementation of the internetworking protocol in a gateway is discussed, and selected performance results are presented. The results show that requirements of high-speed networks with throughputs of more than 100 Mb/s can be fulfilled with the proposed parallel architecture and implementation View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Reliable transfer of data in a local area network with multicast distribution

    Publication Year: 1990 , Page(s): 310 - 319
    Cited by:  Papers (3)  |  Patents (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (760 KB)  

    Certain distributed computing systems require a single device to transmit identical data sets to two or more devices in a local area network (LAN). This kind of data transmission can be achieved by using either a connection oriented protocol such as transmission control protocol/internet protocol (TCP/IP) or a connectionless protocol. Some of the performance aspects of these two kinds of protocols are discussed especially in terms of their ability to distribute identical data sets to two or more devices on the net. In particular, an adaptable and reliable multicast data transfer protocol is described. The client (transmitter) dynamically assigns the designated acknowledger from among the set of servers (receivers). In addition, the client is able to learn from the behavior of the network and modify its transmission algorithm so as to maximize its performance characteristics. The protocol is implemented in a UNIX environment View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • High-speed multimedia backbone LAN architecture based on ATM technology

    Publication Year: 1990 , Page(s): 207 - 212
    Cited by:  Papers (2)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (444 KB)  

    A new high-speed multimedia backbone LAN (MBLAN) architecture that efficiently accommodates existing terminals and offers connectivity with public networks in the introduction stage of broadband ISDN (B-ISDN) is presented. A logical 156-Mb/s ring with the standard synchronous optical network (SONET) format is a basic element to realize the proposed high-speed backbone LAN. Several rings are multiplexed into a 622-Mb/s or 2.4-Gb/s physical transmission line. The slotted ring access method is utilized for each logical ring in order to provide a multimedia communication facility. The slot size and format are based on the asynchronous transfer mode standard and offer easy connectivity with B-ISDN. Independent clocking using the SONET stuffing mechanism is also introduced to solve the jitter accumulation problem View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • IR wireless system for ARCNet local area network

    Publication Year: 1990 , Page(s): 183 - 187
    Cited by:  Papers (7)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (460 KB)  

    Results obtained with a commercial ARCNet LAN that uses an unguided infrared link as a medium of transmission are presented. The effects of shot noise produced by ambient light on the system receiver are characterized. A lab prototype of this LAN gave satisfactory results. In the sphere of optics, filtering of the ambient light from the working environment is studied. The spectrum characteristics for the film filter used are presented View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • FDDI concentrator design issues

    Publication Year: 1990 , Page(s): 388 - 394
    Cited by:  Papers (3)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (440 KB)  

    The fiber distributed data interface (FDDI) standard specifies a robust architecture consisting of four basic types of devices: dual attachment stations (DAS), single attachment stations (SAS), dual attachment concentrators (DAC), and single attachment concentrators (SAC). Many of the prominent issues that face both concentrator designers and their customer, the network designer, are discussed. The discussion is divided into four parts: (1) basic concentrator design, (2) concentrator options, (3) capabilities provided by concentrator options, and (4) utility of concentrator capabilities. It shows that the utility of the added capabilities will vary depending on the goals, objectives, and requirements of the particular installation View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • LCNs and standards: an uneasy future

    Publication Year: 1990 , Page(s): 14 - 16
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (220 KB)  

    It is argued that the development, use, and success of local computing networks (LCNs) has relied in large part on the legitimacy bestowed on them by standards and the standardization process. However, as LCNs become more and more complex, and begin to be seen as part of a larger computing scheme, there are certain requirements that will be levied upon them by the standards creation world. These requirements, while appearing light at first, can quickly become onerous if not carefully considered and built into a systematized approach to standards creating. The needs for test, verification, conformance, revision, and possibly certification all should be considered prior to any new LCN standardization undertaking. Finally, the questions of where and how to standardize to achieve the maximum benefit from the standard and what exactly is this maximum benefit are addressed View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Experiences in local networking at USF

    Publication Year: 1990 , Page(s): 137 - 142
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (452 KB)  

    Some of the experiences in networking at the University of South Florida (USF) College of Engineering are described. The LAN selection process and the wiring requirements are outlined. Two networks, the transcendental operating system (TOPS) and the 3Com Ethernet, are reviewed for implementation in this college environment View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Service integration in FDDI

    Publication Year: 1990 , Page(s): 23 - 32
    Cited by:  Papers (9)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (724 KB)  

    Performance issues of the FDDI-II protocol, an upward-compatible enhancement of the basic fiber distributed data interface (FDDI), are discussed. The main characteristics of the FDDI protocol are examined. The performance of FDDI-II is studied for scenarios including asynchronous traffic, synchronous traffic and isochronous traffic. The results make clear that basic FDDI meets the requirements imposed by traditional local area network (LAN) application and that from a performance point of view FDDI-II is an excellent candidate for complex communications environments. When compared to the distributed-queue-dual bus (DQDB) protocol, FDDI-II yields much better efficiency in traditional LAN applications View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • A high performance implementation of OSI transport protocol class 4; evaluation and perspectives

    Publication Year: 1990 , Page(s): 223 - 230
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (652 KB)  

    General-purpose protocols such as open systems interconnection (OSI) transport protocol class 4 (TP4) are confronted with new requirements in computer communication. The services proposed become unadapted and performance insufficient. Then appears a new generation of high-speed protocols designed for real-time applications or VLSI implementation. TP4 performance and its modeling for multiprocessor implementation are analyzed. Functionalities efficiency and implementation characteristics (about dedicated data structures, resources management, and dedicated algorithms) are presented. General elements on TP4 availability are discussed, and implementation environment characteristics are presented View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.