Showing papers on "Network management published in 1982"

An investigation of the use of network techniques in research and development management

Abstract: Network management techniques were at one time mandatory for aerospace R&D projects. This study investigates the current extent to which network management techniques-the basic PERT/CPM network, cost duration analysis, and critical resource analysis-are being used as part of aerospace R&D management. Ninety-eight interviews with individuals in government and industry gathered data about usage and effectiveness. The results indicate wide use of the basic network techniques, about 50 percent of the organizations contacted, and a very high rating of networks as an R&D planning tool. On the other hand, cost duration analysis and critical resource analysis have low use rates.

Network performance reporting

Abstract: Managing networks using Network Administration Centers is increasingly considered. After introducing the information demand for operational, tactical and strategic network management the paper is dealing with the investigation of the applicability of tools and techniques for these areas. Network monitors and software problem determination tools are investigated in greater detail. Also implementation details for a multihost-multinode network including software and hardware tools combined by SAS are discussed.

Communicaion network failure information transmitting method

Abstract: PURPOSE:To enable to prevent the traffic of communication path from being increased, by the transmission of packet having network managing information. CONSTITUTION:The packet consists of a packet header 50, data section 60, control information 51, transmitted address 52, number of stages 53 after relaying indicating the number of stations relayed for the said packet from the transmission original, and types of the said packet 54. In the section 54, for example, 1 indicates the network managing information packet and 0 shows conventional information packet other than the network managing information. The failed network detected during transmission of packet having the network management information is not transmitted to a monitor station, and the failed network detected during the transmission of packet having conventional information other than the network management information is transmitted to the monitor station.

APLNET, a local computer network

Abstract: A local network has been developed to interconnect computers used by the Applied Physics Laboratory of Johns Hopkins University (APL/JHU). The network is based upon proven, commercially available networking components and the APL/MVS interactive system which offers Iverson's APL to users of large-scale IBM processors. The need for users of the APL language to access data within minicomputer systems and to control specialized peripherals connected to those minicomputers constituted a major motivation for the network. Shared variables provide the interface between APL users and the APLNET network. Network management functions are implemented in APL for maximum ease of customizing and changing both the displays and commands used by management.

Generation of the Mode Select Sensor Network Coverage Map.

Abstract: : This paper describes the technique of designing the network management coverage map files necessary to coordinate a network of Mode S sensors. First, the concept of the Mode S network is defined, and the functions of Network Management are briefly described, as they relate to the coverage map. Then, the rationale for the coverage map is given together with definitions of the map structure and the information required in the file. Implementation of these definitions is illustrated in terms of a specific example: a network of four Mode S sensors in the Washington, D.C. area. As configured, each of the sensors provides service to only one of four ATC facilities (three TRACONs and one ARTCC). The resulting map generation process illustrates not only the general principles but also the significant effects of the ATC control area geometry. Finally, the procedure required for automated map generation is defined. This procedure assumes the use of an interactive computer display terminal and is applicable to any sensor network and ATC facility configuration. (Author)

Network Synchronization Initialization Performance of a TDMA System in the Ground Environment

Abstract: Results from a digital computer simulation of a network of approximately 50 nodes, typifying a spread spectrum time division multiple access (TDMA) system such as the Joint Tactical Information Distribution System (JTIDS), in a ground environment, are presented, and discussed. The results apply to initialization performance of network synchronization. The results provide an insight into network management tradeoffs which may be made with respect to: a) method of network synchronization, b) system capacity needed for network synchronization, and c) degree of network connectivity. The results provide qualitative as well as quantitative assessment of the impact of changing any of the above network management variables when the others remain fixed at various operating points. Since a wide range of time delays, typically from, few to many minutes may be incurred, it is concluded that network management techniques may be optimized to meet the initialization performance requirements of a given network. Such optimizations, however, depend upon specific implementations of the network synchronization process, the dynamics of the network nodes and the environment (electromagnetic, terrain, and weather) affecting their connectivity.