Showing papers on "Network management published in 1984"

An integrated voice and data multiple-access scheme for a land-mobile satellite system

Abstract: A Land-Mobile Satellite System (LMSS) is a satellite-based communications network which provides voice and data communications to mobile users in a vast geographical area. By placing a "relay tower" at a height of 22300 mi, an LMSS can provide ubiquitous radio communication to vehicles roaming in remote or thinly populated area. LMSS is capable of supporting a variety of services, such as two-way alphanumeric service, paging service, full-duplex voice service, and half-duplex dispatch service. A Network Management Center (NMC) will handle the channel requests, channel assignments, and in general the network control functions. A pool of channels is managed at the NMC to be shared by all mobile users. An integrated demand-assigned multiple-access protocol has been developed for the experimental LMSS. The pool of channels is divided into reservation channels and information channels. The information channels can be assigned by the NMC to be either voice channels or data channels. Each mobile user must send a request through one of the reservation channels to the NMC via the ALOHA random-access scheme. Once the request is received and processed, the NMC will examine the current traffic condition and assign an information channel to the user. NMC will periodically update the partitions between the reservation channels, voice channels, and data channels to optimize system performance. Data channel requests are queued at the NMC while voice channel requests are blocked calls cleared. Various operational scenarios have been investigated. Tradeoffs between the data and voice users for a given delay requirement and a given voice call blocking probability have been studied. In addition, performance impacts of such technological advancements as satellite on-board switching and variable bandwidth assignment are discussed.

Telecommunications and processing for military command and control: Meeting user needs in the twenty-first century

Abstract: MILITARY TELECOMMUNICATIONS will have to change significantly in order to support future command and control concepts Highly automated communications systems will be required which must be able to manage themselves at the network level, as well as the internetwork level, if the survivable architectures required by users are going to be developed Emerging technology in packet switching, internetwork protocols, automated network management, and artificial intelligence will provide the foundations for building such systems With these technologies, a military telecommunications and processing environment can be evolved that will readily support distributed and hence survivable command and control in the battlefield of the future

Information Technology and the Computer Network

Abstract: 1 Information Technology.- Information Technology - the requirements.- Feasibility Studies on New Informative Technologies.- Merging of Defence and Civilian Interests in Computer Communications.- 2 Standardisation.- Open Systems Interconnection.- Issues in Multimedia Computer based Message System Design and Standardisation.- Practical benefitsfran Standardisation.- 3 Information Services.- The SERC Network - Its History and Development.- SITA Advanced Telecommunications Services.- Names, Addresses and Directory Services for Computer Mail.- The Demand and Supply of Telematic Services in Portugal.- 4 Network Development.- The Universe Project.- Performance Comparison of Local Area Network Architectures.- Convergence of LAN and Digital Telephone Exchange Systems.- 5 Network Management.- Network Management in a Service Environment.- The Transition towards Open Working.- The Management of the SERC Network.- Computational Techniques for Evaluation of Communication System Performance.- 6 Protocols and Secure Systems.- Open Systems Interconnection Protocols.- Services for Supporting Application Layer Protocols for Distributed Database Systems.- An Overview of Data Encipherment in the Public Domain.- Key Management for Data Encipherment.- Authentication and Signature for Message Handling.- 7 Delegates 'Short' Papers.- The Bibnett 2 Project.- Telplanner (TM) An Expert System for Planning Communication Services.- On the Influence of the Interaction between Entities for Protocol Description.- Communications Services and Distributed System Operations.- Telecommunications related Information Services the User's point of view.- Participants.

Network management simulation of automated guideway rapid transit systems under vehicle-follower control

Abstract: A computer simulation was developed for the evaluation of station operations, vehicle management techniques, and vehicle-follower longitudinal control algorithms in a full automated guideway rapid transit network context The simulation was then exercised to investigate the performance characteristics of interactions among vehicle control, network management, and station models