Voice and video transmission using XTP and FDDI

The use of Xpress Transfer Protocol (XTP) and Fiber Distributed Data Interface (FDDI) provides a high speed and high performance network solution to multimedia transmission that requires high bandwidth. FDDI is an ANSI and ISO standard for a MAC and physical layer protocol that provides a signaling rate of 100 Mbits/sec and fault tolerance. XTP is a transport and network layer protocol designed for high performance and efficiency and is the heart of the SAFENET Lightweight Suite for systems that require performance or realtime communications. The testbed consists of several commercially available Intel based i486 PC's containing off-the-shelf FDDI cards, audio analog-digital converter cards, video interface cards, and XTP software. Unicast, multicast, and duplex audio transmission experiments have been performed using XTP software. Unicast and multicast video transmission is in progress. Several potential commercial applications are described

An intelligent interactive visual database management system for Space Shuttle closeout image management

Status is given of an applications investigation on the potential for using an expert system shell for classification and retrieval of high resolution, digital, color space shuttle closeout photography. This NASA funded activity has focused on the use of integrated information technologies to intelligently classify and retrieve still imagery from a large, electronically stored collection. A space shuttle processing problem is identified, a working prototype system is described, and commercial applications are identified. A conclusion reached is that the developed system has distinct advantages over the present manual system and cost efficiencies will result as the system is implemented. Further, commercial potential exists for this integrated technology

Throughput analysis between high end workstations across an FDDI network

Recently developed high speed networks are capable of transmitting data at rates of 100 Mbps or more. One such network protocol is Fiber Distributed Data Interface (FOOl). This network has a physical. transmissiop rate of 100 Mbps. Analytical and simulation studies have shown that t:le FOOl protocol should provide actual throughput of HO% to 95% of this physical rate. Can the end user expect to see this kind of performance? If not, then what kind of throughput can actually be expected and where are the bottle necks? To answer these and other related questions, two areas were studied: First, a perfomance parison between a 40MHz SPARCstation 10 workstation and a 50MHz SPARCstation 10 workstation was conducted using the Neal Nelson commercial benchmark tool. Next, a well-known network measurement tool, ttcp, was used to obtain data transfer rates while varying several tunable operating system and network parcll11eters. The parameters varied were: Target Token Rotation Time, TCP/IP window size, NFS asynchronous threads, Logical Link buffer siu and Maximum Transfer Unit size. The results from the commercial benchmar~ analyis were used to determine if there are any differences which can affect transfer rates between the two workstations. The results from the conunercial benchmark tool clearly showed that the newer, higher speed processor is faster. The network tool ttcp showed that the TCP/IP window size had the largest impact on throughput performance. Throughput more than doubles from a window size of 4k to a window size of 20k. This is followed by having more than one workstation transmitting data simultaneously. Having two workstations transmitting nearly halves throughput This is followed by having a faster processor. A measurement of flle transfers using rep system calls showed that the largest impact on file transfer speed is the overhead of receiving the transferred file.http://archive.org/details/throughputnalysi1094542915U.S. Army (USA) authorApproved for public release; distribution is unlimited

Technology 2003: The Fourth National Technology Transfer Conference and Exposition, volume 2

Proceedings from symposia of the Technology 2003 Conference and Exposition, Dec. 7-9, 1993, Anaheim, CA, are presented. Volume 2 features papers on artificial intelligence, CAD&E, computer hardware, computer software, information management, photonics, robotics, test and measurement, video and imaging, and virtual reality/simulation

Abstract Multimedia Over FDDI

This paper focuses on issues in multimedia networking over FDDI and simulation results demonstrating the feasibility of multimedia over FDDI. Previous work in this field has concentrated on the asynchronous channel in FDDI. Other examinations of the FDDI synchronous channel have applied bursty traffic to the synchronous channel. Multimedia traffic is typically stream oriented. Our simulations were focused on simulating typical configurations with a range of applications and traffic models. The advantages of FDDI as an integrated voice/video / data network are demonstrated.