Showing papers on "Control communications published in 1984"

Variable bandwidth switching system

Abstract: A communications system that improves upon the availability of communications paths between devices and simplifies the connectivity requirements to communicate data and control information to and from a remote station (11). System nodes (21) are provided which are disposed along a time multiplex network signal stream. The nodes (21) serve to interface remote stations (11) to the network signal stream (25A, 25B) and may also switch information to different stations (11) connected to the same node (21). The nodes (21) are operative to allocate a variable bandwidth of the network signal stream for data communications between devices connected to different nodes. The nodes (21) include switching devices that may be configured to accomodate stations (11) that operate at different speeds. Allocation of bandwidth may be dynamically varied such that system resources are not unneccessarily diverted. Control of bandwidth allocation and internal switching within the node is accomplished via control information communicated to and from the node. Such control information may be contained within the network signal stream and decoded by the node (21) or communicated to the node (21) via a dedicated control communications line. Control information may be encoded into the signal stream communicated between the system node (21) and the remote station (11). Thus, communication of data and control signals between the stations (11) and the system node (21) does not require complex wiring. Accordingly, individual stations (11) may be more conveniently located.

A system for the simulation and evaluation of satellite communication networks

Abstract: With the emergence of a new era in satellite communications, brought about by NASA's thrust into the Ka band with multibeam and onboard processing technologies, new and innovative techniques for evaluating these concepts and systems are required. To this end, NASA, in conjunction with its extensive program for advanced communications technology development, has undertaken to develop a concept for the simulation and evaluation of a complete communications network. Incorporated in this network will be proof-of-concept models of the latest technologies proposed for future satellite communications systems. These include low noise receivers, matrix switches, baseband processors, and solid state and tube type high power amplifiers. To accomplish this, numerous supporting technologies must be added to those aforementioned proof-of-concept models. These include controllers for synchronization, order wire, resource allocation, gain compensation, signal leveling, power augmentation, and rain fade and range delay simulation. Taken together, these will be assembled to comprise a system capable of addressing numerous design and performance questions. The simulation and evaluation system, as planned, will be modular in design and implementation, capable of modification and updating to track and evaluate a continuum of emerging concepts and technologies. Previously announced in STAR as N84-13400

C3I (Command, Control, Communications and Intelligence) Information Systems Internetwork Study.

Abstract: : This report has four subjects: (1) An investigation of DoD protocol standards for computer communications. Emphasis is on the X2.5 protocol and a similar existing DDN protocol. (2) Local area network protocols are discussed with emphasis on security architecture. (3) A study of the logistics usage of AUTODIN and an analysis of a way to reduce the usage. (4) A study of data base management systems and their use in data communications systems. Interfaces to Ada are emphasized in this section.

Improved communications system and network

Abstract: A communications system and network wherein communications links between subscribers are established by retrodirective oscillating loops between each subscriber and a node station. Provision is also made for establishment of retrodirective oscillating loops between nodes so that remotely located subscribers can communicate. Information is transmitted between subscribers by using a mixing process in the node whereby information transmitted from one subscriber to a node is transferred to a carrier signal transmitted between nodes or between a second node and another subscriber. A sampling technique is also described for use in the node which greatly minimizes the amount of apparatus required to implement the mixing process.

Network Facilities For Communications Processing.

Abstract: The Royal Botanic Gardens (RBG) requires an Information and Communication Technology (ICT) Security Policy that addresses security issues related to the integrity and accessibility of information, and risks associated with the use of computers and networks for storing, transferring and processing information. The RBG recognises the importance of protecting its ICT electronic facilities and every employee or other authorised person of the RBG shares this obligation, to a varying degree. This policy has been derived from accepted community standards of common sense and decency that apply to the use of any shared resource. The purpose of this document is to outline RBG employee and other authorised persons' responsibilities and to promote the appropriate use of information and communication technology at the RBG. This policy should be read in conjunction with the attached appendices including the RBG's Code of Practice on Use of the Internet and Electronic Mail. Appropriate and responsible use of the RBG's ICT facilities is consistent with the objectives of the RBG and with objectives of a specific project or task for which such use is authorised. All uses inconsistent with these objectives are considered to be inappropriate use. RBG electronic facilities must be used only for legitimate RBG business. Employees and other authorised persons may use electronic facilities for limited personal use provided that this does not impinge on official duties and is conducted in personal time (refer to clause 27 of the Code of Conduct for the Victorian Public Service – 'the Code of Conduct'). All use of the RBG's ICT facilities, whether RBG business or personal use, is subject to this policy.

The Impact of Emerging Communications Technology on Energy Systems

Abstract: The technology, dimensioning and structure of energy systems for telecommunications in the Federal Republic oF Germany is influenced in particular by the introduction of digital switching, the use of computers 2 for new telecommunication services such as the Deutsche Bundespost's interactive videotex service and the new directory enquiry system, the implementation of optical fibres in the long-distance network, modern telephone sets with new features and the introduction 2 of an Integrated Services Digital Network (ISDN) both in form of a narrowband ISDN over existing copper 11 subscriber lines and a broadband ISDN over optical , fibre subscriber loops. 1

Telecommunication Deregulation And Information Flow

Abstract: This paper discusses issues due to the convergence of computer and communications technology and services. The communications services grew out of national and international regulations. Whereas, the computer technology and services developed outside the regulatory domain. The new informatics and telecommunication services are rapidly expanding. They provide new opportunities and challenge by the flow of information. Information is a resource which is not used up by consumption. Besides, it can be enlarged and shared. It is playing an increasingly important role in the socio-economic life. New instruments are being developed to facilitate the flow as well as to protect the information content from misuse. Due to national diversity, an important factor for the continuation of civilization, it is difficult to harmonize the different economic, legal, political and social issues. Therefore, these different systems must work independently as well as interdependently. When selecting national and international instruments, the goal is to keep each society open and its power structure decentralized. This may be accomplished by either regulation or competition of the marketplace, depending on the ideology of the respective society. Each society may chose its own path but all need to agree on the common goal.

NATO III Satellite Communications System Control

Abstract: The system control concepts to improve channel utilization and the recent progress of the design, development, and integration of the control subsystem for the satellite communications network are reported. The network operates with a large number of single-destin ation radio frequency carriers to provide voice, low-speed telegraph, and medium-speed data circuits. A power control algorithm to keep the link quality at the desired nominal level and a traffic control algorithm allowing reconfiguration of the network to accommodate fluctuating traffic are presented. The system control software development cycle, consisting of design, which includes functional decomposition and software module structure, integration and testing phases, is discussed. Various functional flow diagrams are provided illustrating the information interfaces to external communications, the network data base, and the physical devices. An example illustrating the performance of power control and traffic control software is presented.