Showing papers on "Wireless WAN published in 1989"

Performance analysis of a LAN/WAN bridging architecture

Abstract: A performance analysis of a virtual-circuit-based wide-area network (WAN) that performs local-area-network (LAN) bridging is presented. This type of WAN is suitable for LAN bridging because the conversion of functions between the LAN protocol and the WAN protocol can be simplified by assigning a virtual circuit to each bridge-to-bridge (edge-to-edge) connection. With this architecture, routing is performed efficiently and network resources are used on demand. Analytical approximations of bridge throughput packet delay and packet-loss rates are provided as a function of network and protocol parameters. >

Distributed Fairness Algorithms for Local Area Networks

Abstract: In this work, it is shown how multiple nodes can access a ring network concurrently with spatial reuse and in a fair manner. Traditionally, most ring and bus networks do not allow spatial reuse, e.g., FDDI, DQDB (IEEE 802.6). Concurrent access with spatial reuse enables the simultaneous transmissions over disjoint segments of a bidirectional ring, and therefore, can significantly increase the effective throughput, by a factor of four or more.

Intelligent network management for customer controlled services

Abstract: The authors describe an intelligent network that enables customers to define their own services. A customer controlled service concept is introduced in terms of a network hierarchy and functional assignment, and the basic network architecture is presented. Network resources which allow customer control are clarified, and a customer control process is examined. A private virtual network service is introduced, and practical customer controlled services are presented. >

SITRAL: an integrated telephony service over a local area network

Abstract: The authors describe and examine the implementation of SITRAL (Servicio Integrado de Telefonia sobre Red de Area Local), a telephony service over an Ethernet local area network, integrating voice and data and providing both the call control procedures and the packetized voice channels on the nodes of the network for internal calls and access to the public network. The different elements of the voice-data nodes are explained. A brief taxonomy of alternative access methods for the voice packets is presented. A telephony service has been shown to be possible over a standard IEEE 802.3 network. Simulation results show that more than a hundred telephones can use the service simultaneously with a data load of 10%. >

Evolution and integration of a multi-media communications network

Abstract: A possible scenario is considered for the evolution of the public switched network to serve the communication needs of multimedia terminals. The authors explain how the local-area network (LAN) is evolving toward the metropolitan-area network (MAN) and the wide-area network (WAN), which can interconnect multiple LANs and high-speed workstations dispersed in different parts of a metropolitan area. They then describe the evolution of the ISDN provide high-speed communication services such as video, and in addition, the evolution of the X.25 packet network toward the frame-relaying network. Such a network improves the throughput/delay performance of the data network. It is concluded that these different evolutionary paths should eventually converge to the next generation switching system that will provide integrated voice/data/image/video capabilities. >

An RS-232-C local area network

Abstract: A description is given of a local area network (LAN) used to link PCs to other serial devices using an RS-232-C interface. The hardware and software elements of the network controller are explained in terms of an actual implementation. The LAN design reflects a strategy of providing a transparent switching capability using only RS-232-C data transmission. The implementation involved the linking of several PCs connecting to several serial devices. >

Inter-network connection of the local area networks C-net and omninet

Abstract: Today, commercialized local area networks are emerging one after the other. A single network, however, cannot meet the needs of all the different users in larger areas because of the limitations of the area it covers and the limited sharing of resources. Hence, many users have been asking for computer networks to be interconnected. We propose a scheme for interconnecting C-Net and Omninet, in which one C-Net and one Omninet station are used as half-gateways, connected by the standard interface RS232c. We successfully implemented inter-network high-level protocols for electronic mail and file transfer between C-Net and Omninet. This paper describes in detail the role of the two half-gateways, the interconnection level and design principles and the practical application of the method.

Packet-switching network of dynamic architecture based on artificial intelligence

Abstract: A method of designing packet-switching network of dynamic architecture based on artificial intelligence is discussed in detail. According to this method, the intelligent information about the user's requirements and network states is used to control the network architecture's exchange so that its information transmission efficiency is increased greatly. Some technical problems and experimental results concerning this dynamic-architecture packet-switching network (DAPSN) are examined. It is suggested that the design principle of DAPSN can be widely applied in many computer networks, for example, the MAN, WAN, LAN, (metropolitan, wide, and local area networks), andISDN (integrated services digital network). >

Capacity testing a HYPERchannel-based local area network

Abstract: Using a hardware monitor, the capacity of a mature (over 10 years old), heavily loaded (5 Cray supercomputers, 3 Ethernet gateways, 13 terminal concentrators, 5000 terminal, 40 node) two-trunk, HYPERchannel-based, high-data-rate local area network was tested. Results indicate that the current load could be intensified by 40% before the network reaches saturation. As the load approaches saturation, overly persistent, low-level protocols begin thrashing, effectively destabilizing the network and destroying much of its potential capacity. The steps needed to extend its lifespan and improve its performance under heavy loads are recommended. >