Accession Number : ADA202535

Title :   Performance Analysis of the Fiber Distributed Data Interface in the Super Cockpit Audio World.

Descriptive Note : Master's thesis,

Corporate Author : AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH SCHOOL OF ENGINEERING

Personal Author(s) : Forlanda, Juancho E.

Report Date : DEC 1988

Pagination or Media Count : 288

Abstract : The purpose of this thesis was to determine if the Fiber Distributed Data Interface (FDDI) network, a 100 Mbps fiber optic ring network, could satisfy the networking requirement (to support up to 130 terminals) of the Super Cockpit Audio World. To help make this determination a computer simulation was created to model the FDDI network and the load that may be created by several audio world terminals on that network. The simulation model used the mean token rotation time (TRT) in combination with a specified target TRT (TTRT) as the performance parameter of interest. The TRT responses of FDDI were observed for cases where all terminals used 16-bit PCM, 5-bit ADPCM, CVSD, or LPC (packetized to 4096, 16384, or 35904 bits; for 50, 100, 130, and 150 stations) with or without silence suppression to the audio signals begin transmitted. The simulation results (the TRT responses) revealed that FDDI can support 130 audio terminals using 16-bit PCM; however, it cannot support 150 audio terminals. When silence suppression is applied, FDDI is able to support the same 150 terminals with less than a 2% probability that an audio packet would be late for play out on a receiving audio terminal. The simulation results also showed that at least 150 terminals using 5-bit ADPCM, CVSD, or LPC with or without silence suppression could be accommodated by FDDI. (FR)

Descriptors :   *FIBER OPTICS TRANSMISSION LINES, *DATA PROCESSING TERMINALS, *INTERFACES, *COMMUNICATIONS NETWORKS, ACOUSTIC SIGNALS, COCKPITS, COMPUTERIZED SIMULATION, AUDIO FREQUENCY, MATHEMATICAL MODELS, PARAMETERS, PERFORMANCE TESTS, QUIET, RINGS, ROTATION, SIMULATION, SOUND, SUPPRESSION, TERMINALS, TIME.

Subject Categories : Computer Systems
      Aircraft

Distribution Statement : APPROVED FOR PUBLIC RELEASE