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Proceedings Paper

ITU T.120 series of standards as a basis for conference applications
Author(s): Dirk Trossen; Tobias K. Helbig
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Paper Abstract

Conference applications facilitate communication and cooperation between users at different locations. Increased costs and the distribution of institutions and companies lead to a stronger need for coherence applications as an efficient utility for collaboration. The deployment of coherence applications was enabled by research progress in communications and distributed algorithms as well as by increased performance of computers and networks. Efficient standardized protocols become mandatory to enable the connectivity among systems of different vendors and to facilitate the implementation of coherence applications. The ITU defined a number of standards for conference applications in the T.120 series of standards. The paper describes and evaluates the features of the ITU T.120 series of standards. The concepts and algorithms are analyzed with regard to the application scenarios that can be covered efficiently. The analysis shows two main conceptual weaknesses. First, efficient multicast capabilities of networks are not directly used since multipoint connections are inefficiently mapped on reliable point-to-point connections. Second, the administration of the conference data base is defined in a way not suited for conferences with many participants. The theoretical analysis is backed by a number of measurements performed with our implementation of the T.120.

Paper Details

Date Published: 1 February 1998
PDF: 12 pages
Proc. SPIE 3228, Multimedia Networks: Security, Displays, Terminals, and Gateways, (1 February 1998); doi: 10.1117/12.300890
Show Author Affiliations
Dirk Trossen, Technical Univ. of Aachen (Germany)
Tobias K. Helbig, Philips GmbH Research Labs. (Germany)


Published in SPIE Proceedings Vol. 3228:
Multimedia Networks: Security, Displays, Terminals, and Gateways
Louis S. Lome; V. Michael Bove; Barbara Derryberry; Clifford R. Holliday; Louis S. Lome; Vishal Markandey; Andrew G. Tescher; Bhaskaran Vasudev, Editor(s)

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