Showing papers on "Wireless WAN published in 1988"

Extended bridge algorithms for large networks

Abstract: A network bridge is a device that operates at the ISO data link level and routes packets across extended networks, commonly composed of multiple local area networks (LANs) and bridges. A set of algorithms that greatly extends the application of the network bridge is presented. This multitree bridge algorithm allows networks of arbitrary topology and capacity to use bridge routing. The reduced broadcast bridge algorithm alleviates the problem of extraneous broadcasting in large networks built from bridges and packet switches. A method for routing to network users who change their location rapidly, as in mobile cellular radio systems, is presented. An algorithm for efficient multicasting in bridges is given. Application of this technology to the broadband integrated services digital network (BISDN) is proposed. >

Wireless intraoffice networks

Abstract: An overview of the existing and growing demands for wireless office information networks is provided, and the existing research activities are assessed in some detail The radio frequency (RF) and infrared (IR) communication technologies are examined as candidates for wireless intraoffice communications The available bandwidths, according to federal regulations and characteristics of the channel for RF communications, are given Digital narrow-band and wideband spread-spectrum RF communications are assessed in terms of supportable data rate or number of simultaneous users in one cell of a cellular architecture in an office environment Various limitations of IR communications are discussed and existing systems and architectures are reviewed

Bellcore Metrocore network-a test-bed for metropolitan area network research

Abstract: The authors describe the Bellcore Metrocore network, a testbed prototype of a metropolitan area network (MAN) for exploring network concepts and technology applications in broadband communications. This system operates at 150 Mb/s with the potential for upgrading to multi-Gb/s. A basic hardware architecture has been designed which consists of a network interface (media access control (MAC) layer), and several independent, modular units that interface to various services. At the MAC layer, integrated services are supported by giving priority to those traffic types requiring bounded delay. The software network architecture includes a network controller to configure, monitor, and administer the network. >

Architecture and design of an open systems LAN/WAN gateway

Abstract: The authors report on architectural alternatives and an implementation design of an open systems LAN/WAN (local area network/wide-area network) gateway which connects a private (IBM token ring) LAN with a open WAN based on a public X.25 packet-layer protocol. The gateway design applies and generalizes the ideas underlying the ISO Open Systems Interconnection (OSI) reference model for heterogeneous communication networks. The gateway presented is currently implemented in a project which supports distributed data-intensive applications in a heterogeneous LAN and WAN configuration. >

LANCET: local area network comprehensive evaluation tool

Abstract: The features and capabilities of the local area network comprehensive evaluation tool (LANCET) are described LANCET is a network monitoring and management package developed for a Unix workstation which incorporates many of the capabilities of special purpose network monitoring hardware Traffic monitoring, generation, and display features of the system are discussed Future extensions to the system are proposed >

Hybrid-Meshnet: a new-approach to mesh LANs

Abstract: The authors introduce a communication subnet architecture, called Hybrid Meshnet, for local area networks (LANs) that is designed to achieve a high degree of network performance and flexibility. These objectives are achieved by utilizing a dual-channel structure. A token ring is used for short or prioritized data transmissions. A complementary mesh network with arbitrary data links is used for relatively high volume and low-priority data transmission. A distributed network control and routing mechanism allocates the communication network nodes. Hybrid Meshnet supports a LAN system in which the communication structure may easily be modified and changed by the insertion or deletion of data links. >

Local Area Networks

Abstract: A local area network is a data communication network that spans a physically limited area (generally less than a mile or two), provides high-bandwidth communications over inexpensive media (generally coaxial cable or twisted pair), provides a switching capability, and is usually owned by the user. There are radical differences between the network topology for a telephone network and that for a local area network. While a telephone network has a hierarchical form, a local area network has a very regular form that is a star, a ring, or a bus. Each topology is best suited to particular media types, has an optimum routing strategy, and has identifiable reliability characteristics. A polling system is a control scheme used for networks such as military, weather, and airline reservation systems. In a token system, a special bit pattern referred to as the “token” circulates around the ring. The token system provides the fairness and distance insensitivity of the polling system and also provides far more efficient utilization of the medium.

A broadband local area network using the intelligent head-end

Abstract: A broadband local area network system call is illustrated using the previously developed intelligent head-end. The head-end provides the advantages of dynamical channel exchange and network configuration control facility. The head-end exchanges analog information in a manner similar to the digital exchange. A novel LAN architecture is described, which is based on the open system interconnection for the broadband network, to which the digital/analog devices are connected. A prototype model experiment is presented. >