AffiliationEdwards Air Force Base
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Collection InformationProceedings from the International Telemetering Conference are made available by the International Foundation for Telemetering and the University of Arizona Libraries. Visit http://www.telemetry.org/index.php/contact-us if you have questions about items in this collection.
AbstractThe Edwards Digital Switch (EDS) provides mission critical voice and time-spaceposition information (TSPI) communication switching capability to the Edwards Test Range. The present system has been in operation for about 10 years. The core of this system is based on widely used commercial-off-the-shelf (COTS) time-slot interchange switches that were designed for a 40-year service life. The application layers of the system, comprising the command/control elements and the communications and user interfaces, were custom developed by the prime contractor to satisfy the performance requirements of the Air Force Flight Test Center (AFFTC). Problems with the current system include difficulty in obtaining replacement items for equipment developed by the prime contractor and higher than expected failure rates for this equipment. Based on experience, the service life for the equipment developed by the prime contractor appears to be about 15 years. Another problem is that lower cost packet switches are taking market share from the more traditional time-slot interchange switches. This factor tends to accelerate the obsolescence of the existing COTS equipment. Solutions are being investigated to update or replace the EDS. One solution is to reuse the existing COTS core equipment and replace the present application layers, preferably with COTS. Another solution is to replace the entire system with COTS or vendormodified COTS hardware and software.
SponsorsInternational Foundation for Telemetering
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ASSESSMENT OF PHOTONIC SWITCHES AS FUTURE REPLACEMENT FOR ELECTRONIC CROSS-CONNECT SWITCHESYoussef, Ahmed H.; TYBRIN Corporation; Edwards Air Force Base (International Foundation for Telemetering, 1999-10)This paper presents the future of optical networking via photonic switches as a potential replacement for the existing electronic cross-connects. Although optical amplifiers are now mainstream and wave division multiplexing (WDM) systems are a commercial reality, the industry’s long-term vision is one of the all-optical network. This will require optical switching equipment such as all-optical or “photonic” cross-connect switches that will provide packet switching at an optical layer. Currently, as voice calls or data traffic are routed throughout Range and commercial networks, the information can travel through many fiber-optic segments which are linked together using electronic cross-connects. However, this electronic portion of the network is the bottleneck that is preventing the ideal network from achieving optimal speeds. Information is converted from light into an electronic signal, routed to the next circuit pathway, then converted back into light as it travels to the next network destination. In an all-optical network, the electronics are removed from the equation, eliminating the need to convert the signals and thereby significantly improving network performance and throughput. Removing the electronics improves network reliability and restoration speeds in the event of an outage, provides greater flexibility in network provisioning, and provides a smooth transition when migrating to future optical transmission technologies. Despite the fact that photonic switching remains uncommercialized, it now seems apparent that the core switches in both the public networks and DoD Range networks of the early 21st century will probably carry ATM cells over a photonic switching fabric.
A model and algorithm for sizing and routing DCS switched telecommunications networksHigle, Julia L.; Cameron, Grant Arthur, 1960- (The University of Arizona., 1998)Demand for broadband services such as fax, videotelephony, video conference and data transmission continues to explode as we move into the twenty-first century. The new broadband demand differs from voice traffic in that it varies rapidly with respect to the average length of time capacity is held by a customer. Hence, steady state models of network traffic are not valid in general, and may not provide approximations that are sufficiently accurate for network design. In addition, modern telecommunications networks incorporate advanced switching technology that can provide flexible routing of network traffic based on network load and projected demand. It is desireable to take advantage of this new flexibility to design reliable, yet low cost, networks. In this dissertation a multistage stochastic linear programming model for the design of broadband networks is presented, along with a specialized algorithm for solving the program. The algorithm is based on Network Recourse Decomposition (NRD) first introduced by Powell and Cheung. The solution method incorporates cost calculations that prove to be useful for both sizing and routing decisions.
RTL AND SWITCH-LEVEL SIMULATION COMPARISON ON EIGHT BIT MICROPROCESSORLai, Jiunn-Yiing, 1958- (The University of Arizona., 1987)In this research, an AHPL (A Hardware Programming Language) based automation system is used to design and verify the Intel-8080 microprocessor from the RTL (Register Transfer Level) hardware description through the network list of transistors. The HPSIM is used as a RTL simulator which interprets the AHPL description and executes the connections, branches, and register transfer, and prints line or register values for each circuit clock period. After the AHPL description has been translated to switch-level link list, ESIM is applied for more detailed simulation to ensure the digital behavior in this microprocessor design is correct. The ESIM is an event-driven switch-level simulator which accepts commands from the user, and executes each command before reading the next one. After performing these different levels of simulations, a comparison is discussed at the end.