Showing papers on "Heterogeneous network published in 1983"
TL;DR: Results for normal load and overload reveal high throughput and low transfer times which are basic for a wide range of applications in LAN's.
Abstract: This paper reports on the implementation of a local area network (LAN) operating under a new CSMA-CD protocol with dynamic priorities (CSMA-CD-DP). User terminals, host computers, and other servers are connected to a common broad-band channel through N network access stations in a clustered manner. This concept reduces the number of network access stations and enhances the utilization of hardware and software resources greatly. A new protocol has been developed which organizes the decentralized operation of the distributed network access stations and which allows for a number of specific features. In the idle state the channel is operated in the contention mode. After the beginning of a transmission, the channel is operated in a reservation mode. Channel arbitration after a completed transmission is resolved by staggered delays; at any time, each station owns a distinct transmission delay which is changed after every successful transmission by broadcasted acknowledgments. This protocol strictly limits the possibility of collisions and approaches the effectiveness of token and polling protocols with increasing load. Through specific allocations of transmission delays, static priorities or dynamic overload control can be realized easily. The performance of the CSMA-CD-DP protocol has been modeled and analyzed analytically as well as by simulation. Results for normal load and overload reveal high throughput and low transfer times which are basic for a wide range of applications in LAN's.
49 citations
TL;DR: The framework and model of a network operating system (NOS) called MIKE, which stands for Multicomputer Integrator KErnel, provides system-transparent operation for users and maintains cooperative autonomy among local hosts.
Abstract: This paper presents the framework and model of a network operating system (NOS) called MIKE for use in distributed systems in general and for use in the Distributed Double-Loop Computer Network (DDLCN) in particular. MIKE, which stands for Multicomputer Integrator KErnel, provides system-transparent operation for users and maintains cooperative autonomy among local hosts.
34 citations
IBM1
TL;DR: This paper reviews the evolution of routing mechanisms in IBM's Systems Network Architecture since its inception in 1974 to the present and possible evolutionary paths that may be taken in the future to address the problems of large heterogeneous networks.
Abstract: This paper reviews the evolution of routing mechanisms in IBM's Systems Network Architecture (SNA) since its inception in 1974 to the present. Routing mechanisms are related to changes in the application and communications environment. Also discussed are possible evolutionary paths that may be taken in the future to address the problems of large heterogeneous networks.
31 citations
TL;DR: This paper describes one example of a broad-band LAN protocol architecture, LocalNet (TMSytek Inc.), with particular attention paid to those design decisions and practical considerations which were prompted by the intended environment.
Abstract: The protocol architecture of a broad-band local area network (LAN) must consider a realm of issues ranging from user device requirements to the characteristics of the underlying broad-band cable medium. The primary environment for which these protocols are intended consists of a collection of multichannel broad-band local networks, connected by point-to-point links. This paper describes one example of a broad-band LAN protocol architecture, LocalNet (TMSytek Inc.). Particular attention is paid to those design decisions and practical considerations which were prompted by the intended environment.
20 citations
01 Apr 1983
TL;DR: This paper describes a distributed architecture for the flexible interconnection of heterogeneous networks with a number of mini- and micro computers, in a research environment, which includes the DARPA Internet, and the X25-based networks PSS and SERCNET.
Abstract: This paper describes a distributed architecture for the flexible interconnection of heterogeneous networks with a number of mini- and micro computers, in a research environment. The interconnected networks include the DARPA Internet, which uses the DoD protocols, and the X25-based networks PSS and SERCNET. The approach described here distributes the network access into a set of microcomputers acting as network frontends ("network access machines"), with a local area network (Cambridge Ring) as a common bus. Communication between the hosts and the network access machines uses an interprocessor communication mechanism with a standard transport-level virtualcall interface, which is described. This arrangement provides local hosts with flexible access to any of the networks, and supports a relay system which allows users on one network to access hosts and facilities on any of the other networks.
14 citations
01 Oct 1983
TL;DR: The paper focus on the OSI model feasability and outlines the encountered problems and the adopted solutions in the network design and implementation.
Abstract: The ISO-OSI reference model was the design framework for the implementation of a heterogeneous network in a local environment. The HMINET-2 is a network based on standards in data communication. The paper focus on the OSI model feasability and outlines the encountered problems and the adopted solutions in the network design and implementation.
4 citations
TL;DR: Details of the experience in implementing the Nestar Plan 4000 network with emphasis on the problems encountered and how they were solved are discussed, including how the physical and datalink layers were implemented.
Abstract: The Nestar Plan 4000 network was designed using the ISO Open Systems Interconnection model. The Xerox Network Systems Internet Transport Protocols (XNS) were chosen for the network and transport layers, a token-passing protocol (Arcnet) for the physical and datalink layers, and existing Nestar server software for the highest layers. The physical and datalink layers are supported by a VLSI chip and their implementation was straightforward. In spite of their detailed specification, implementing the network and transport layers presented some unanticipated challenges. This paper discusses details of our experience in implementing the network with emphasis on the problems encountered and how they were solved.
4 citations
TL;DR: In this paper the dual network configuration is outlined, the approach to building a general-purpose network access unit is explained and a description is given of how the PDP-11 and LSI-11 computers at present interface to both networks.
3 citations
TL;DR: The HMINET-2 as discussed by the authors is a network based on standards in data communication, which is a reference model for the implementation of a heterogeneous network in a local environment.
Abstract: The ISO-OSI reference model was the design framework for the implementation of a heterogeneous network in a local environment. The HMINET-2 is a network based on standards in data communication. Th...
3 citations
07 Dec 1983
TL;DR: With the increase in the number of Personal Computers in offices and factories, a demand has been created to connect these independent units in a network and to share not only data but also expensive peripheral equipments.
Abstract: With the increase in the number of Personal Computers in offices and factories, a demand has been created to connect these independent units in a network and to share not only data but also expensive peripheral equipments.On the other hand, local area network technology has become an active area of research and development during the last few years.
1 citations
TL;DR: A small local area bus network which access controller cost is much lower than the existing equivalent ones, and could be in one way a support to a technological teaching, and in another way the prototype for connecting control devices, personal or home microcomputer systems, essentially heterogeneous.
01 Oct 1983
TL;DR: This paper analyzes the heterogeneous Bell Labs Network (BLN) environment and lists the potential network security risks and proposes counter-measures for minimizing potential exposure.
Abstract: In a heterogeneous computer network, resources on each node are protected by the local security mechanism. Network services allow local resources to be accessed remotely from other nodes. Without appropriate network security measures, each node is vulnerable to attack from the network. This paper analyzes the heterogeneous Bell Labs Network (BLN) environment and lists the potential network security risks. By assessing the risks, counter-measures are proposed for minimizing potential exposure. These counter-measures are part of a global network security mechanism being implemented for BLN.