1 February 1998 ITU T.120 series of standards as a basis for conference applications
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Proceedings Volume 3228, Multimedia Networks: Security, Displays, Terminals, and Gateways; (1998); doi: 10.1117/12.300890
Event: Voice, Video, and Data Communications, 1997, Dallas, TX, United States
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.
© (1998) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Dirk Trossen, Tobias K. Helbig, "ITU T.120 series of standards as a basis for conference applications", Proc. SPIE 3228, Multimedia Networks: Security, Displays, Terminals, and Gateways, (1 February 1998); doi: 10.1117/12.300890; https://doi.org/10.1117/12.300890
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