1993
Autores
ASSIS, P; ALMEIDA, A; HENRIQUES, M; RICARDO, M; FERREIRA, P; PROENCA, P; CARRAPATOSO, E;
Publicação
LOCAL AND METROPOLITAN AREA NETWORKS
Abstract
The test and performance evaluation of high speed networks pose problems that cannot be solved by traditional equipment. In this paper, the concept of a powerful and versatile tool, capable of generating and detecting traffic to test and assess the performance of such networks, is presented.
1993
Autores
LEAL, F; OLIVEIRA, C; SILVA, J; VIANA, P; CARRAPATOSO, E;
Publicação
VIDEO COMMUNICATIONS AND PACS FOR MEDICAL APPLICATIONS
Abstract
This contribution describes a Videotex terminal with photographic capabilities based on a personal computer (PC). This system takes advantage of a recently available support - the Integrated Services Digital Network (ISDN) - which represents a significant improvement in the performance of communication systems, and is intended to offer a new and practical service while maintaining compatibility with the Alphamosaic Videotex.
1993
Autores
Leal, F; Oliveira, C; Silva, JA; Viana, P; Carrapatoso, E;
Publicação
Video Communications and PACS for Medical Applications
Abstract
1992
Autores
ALMEIDA, N; CABRAL, J; ALVES, A;
Publicação
LECTURE NOTES IN COMPUTER SCIENCE
Abstract
The provision of real time services through a Packet Switched Network, requires the adoption of end-to-end synchronization methods. Several of these methods, are compared and a specific hardware solution is discussed. Results obtained through a specially designed Simulation Programme are included, for several network time delay jitter distributions and synchronization methods. These results are used to evaluate systems and design parameters.
1992
Autores
JOHNSTON, JD; FERREIRA, AJ;
Publicação
ICASSP-92 - 1992 INTERNATIONAL CONFERENCE ON ACOUSTICS, SPEECH, AND SIGNAL PROCESSING, VOLS 1-5
Abstract
1991
Autores
Salgado, HM; O'Reilly, JJ;
Publicação
IEE proceedings. Part J, Optoelectronics
Abstract
A frequency domain analytic study of laser nonlinear distortion is presented, based on the Volterra nonlinear functional series. This analysis is shown to predict all the intermodulation products up to third order, of particular relevance to the design of subcarrier multiplexed systems, when the laser is modulated by an arbitrary number of channels. Illustrative analytic and simulation results are presented for two and three input subcarriers and are shown to match very closely.
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