In order for cable television networks to support metropolitan area networks, high-speed two-way links to the users are needed. Switched star seems to be the most promising architecture for this application, but the c...
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In order for cable television networks to support metropolitan area networks, high-speed two-way links to the users are needed. Switched star seems to be the most promising architecture for this application, but the choice of the access protocol is not yet decided. Some possible topologies and access protocols are assessed for single-level and hierarchical systems. It is determined that hierarchical networks have, under most conditions, shorter delays than single-level networks for the same offered traffic.
A formal method for protocol design using a Petri net model is considered. Two phases of protocol design, specification and verification, are presented for a simple example.
A formal method for protocol design using a Petri net model is considered. Two phases of protocol design, specification and verification, are presented for a simple example.
the problem of discrete capacity assignment is examined from the viewpoint for constraints. To solve the problem under these constraints, two algorithms are proposed, one based on dynamic programming and the other on ...
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the problem of discrete capacity assignment is examined from the viewpoint for constraints. To solve the problem under these constraints, two algorithms are proposed, one based on dynamic programming and the other on heuristic techniques. the performance of these algorithms is evaluated for various computer network applications, and the results are discussed. An application on the Greek public data network is also given.
Low-complexity packet-switched networks with quasistatic input traffic behavior are considered. An algorithm of the Newton-Raphson type is proposed to specify the minimum average delay routing in a such a network. It ...
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Low-complexity packet-switched networks with quasistatic input traffic behavior are considered. An algorithm of the Newton-Raphson type is proposed to specify the minimum average delay routing in a such a network. It is compared to another frequently used algorithm, and the results obtained are in favor of the proposed algorithm. the comparison is based on the number of iterations and the CPU time needed to reroute the traffic after a change occurs.
Some preliminary thoughts are presented regarding the design of a communication software in a local area network (LAN) that is based on the Ethernet protocol, using TCP/IP and X. 25, and supplies basic services to hos...
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Some preliminary thoughts are presented regarding the design of a communication software in a local area network (LAN) that is based on the Ethernet protocol, using TCP/IP and X. 25, and supplies basic services to hosts running Unix and/or other operating systems. the goals of this study are: to assure the maximum compatibility in communications between computers made by different manufacturers to each other, and independently to a particular Unix version;to interface the intra/network software of the Fiore Project (a metropolitan area network in Florence) and to be transparent to Unix users, (i. e. commands, when possible, must maintain the syntax of existing Unix commands).
A Modula-2 implementation of the Open Systems Interconnection Transport Protocol (class 4) is presented. the use of Estelle, a formal language for protocol specification, and some tools for semiautomatic implementatio...
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A Modula-2 implementation of the Open Systems Interconnection Transport Protocol (class 4) is presented. the use of Estelle, a formal language for protocol specification, and some tools for semiautomatic implementation and testing based on Estelle are described. the main advantages of Modula-2 in protocol development are outlined.
the results obtained using formal description techniques to specify and develop several communication protocols and services are presented. the software tools--the Estelle and Lotos language--supporting the techniques...
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the results obtained using formal description techniques to specify and develop several communication protocols and services are presented. the software tools--the Estelle and Lotos language--supporting the techniques are described. the development cycle for each technique is presented, and it is shown how to exploit the best features of Estelle and Lotos in the abstract specification, formal verification, automatic implementation, and testing phases.
A throughput analysis of the X. 224 transport protocol over an X. 25 network service is presented. In this environment, the key parameters for tuning protocol performance are the transport and network windows. the mos...
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A throughput analysis of the X. 224 transport protocol over an X. 25 network service is presented. In this environment, the key parameters for tuning protocol performance are the transport and network windows. the most important parameters of the X. 25 service are characterized, and expressions for transport throughput are obtained in the customary case of bulk traffic. Quantitative results show a high degree of influence of the selected windows on the transport throughput.
Research conducted on a character recognition system suitable for use in a reading aid for multifont Arabic printed numeral text is reported. the classifier is based on digital learning networksthat implement the n-t...
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Research conducted on a character recognition system suitable for use in a reading aid for multifont Arabic printed numeral text is reported. the classifier is based on digital learning networksthat implement the n-tuple method of pattern recognition. the classifier can be simulated on a small digital computer or constructed at low cost using memory elements. the structure of the proposed text reader device is outlined, with a list of desired characteristics of each of its subsystems. Experiments are reported that are concerned mainly with investigating problems associated directly withthe Arabic text reader, namely, accommodation of multifont printed text, toleration of displacements in the alignment of the character withthe viewing window, and segmentation of the scanning text into its separate characters. Satisfactory performance of the system is demonstrated.
Ethernet is a local area network which provides a communication facility for high speed data exchanges among computers and other digital devices. Ethernet was the basis for the 10 Mbps CSMA/CD baseband standard of the...
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Ethernet is a local area network which provides a communication facility for high speed data exchanges among computers and other digital devices. Ethernet was the basis for the 10 Mbps CSMA/CD baseband standard of the ieee 802. 3 Standards Committee. the Ethernet network can link equipment manufactured by a variety of vendors and cover a fairly large geographic area with high performance characteristics. the primary goal of the Cheapernet standards committee was to develop and propose an economical network. A secondary goal was to develop a network that would easily be implemented with products readily available today and also would be acceptable to the industry. Cheapernet and thinnet are synonymous and will be used interchangeably. this paper discusses the design and implementation of an undercarpet Ethernet/thinnet distribution and interconnection system. this system was developed to address the cabling and connection issues present when integrating the bus network design into the modern office landscape.
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