Evaluation of teleteaching services over ATM and IP networks q.pdfVIP

Telematics and Informatics 20 (2003) 1–18 /locate/tele Evaluation of teleteaching services over ATM and IP networks q Ch. Bouras *, A. Gkamas, V. Kapoulas, Th. Tsiatsos Computer Technology Institute, Greece, Riga Feraiou 61, GR-26221 Patras, Greece Computer Engineering and Informatics Department, University of Patras, Greece, Riga Feraiou 61, GR-26221 Patras, Greece Abstract This paper presents the components of a synchronous teleteaching application, their un- derlying technology and their interaction with network services. In addition, it presents the architecture and design of a synchronous teleteaching application used over the public ATM network in Greece. This paper presents various teleteaching scenarios over an ATM network infrastructure with the use of native ATM and IP over ATM. In each scenario we present the standards used, the logical components, the resource demands (network and equipment) and its special characteristics. For each scenario we give detailed information about the trans- mission and frame rates and the video delay. The main result of our experiments is that broadband networks offer many capabilities for high quality teleteaching, and generally speaking, high quality telematic services. 2002 Elsevier Science Ltd. All rights reserved. Keywords: Teleteaching scenarios; ATM; Broadband networks; Teleteaching evaluation 1. Introduction In the recent years, both computer and communication companies have made great efforts to include multimedia capabilities in workstation and desktop systems. Multimedia teleconferencing systems have thus become widely accepted, because q A shorter version of this paper has been presented in ATMTU-200 conferen