A Multicast Gateway for Dial-In Lines

Kuhmünch, Christoph

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URL: https://ub-madoc.bib.uni-mannheim.de/779
URN: urn:nbn:de:bsz:180-madoc-7792
Document Type: Working paper
Year of publication: 1998
The title of a journal, publication series: Technical Reports
Volume: 98/004
Place of publication: Mannheim
Publication language: English
Institution: School of Business Informatics and Mathematics > Sonstige - Fakultät für Wirtschaftsinformatik und Wirtschaftsmathematik
MADOC publication series: Veröffentlichungen der Fakultät für Mathematik und Informatik > Institut für Informatik > Technical Reports
Subject: 004 Computer science, internet
Subject headings (SWD): Multicastingverfahren , ISDN , MBone , Fernunterricht
Keywords (English): computer-based distance learning , ISDN , MBone , media scaling
Abstract: With the increasing number of MBone sessions the interest of home users to partici-pate is also increasing. Unfortunately the cost for the hardware necessary to participate in multicast sessions over a high speed link are still prohibitively high. In our Inter-active Home Learning project are providing methods to participate in a teleteaching lecture on the MBone from a PC at home via a low-bandwidth con-nection (e.g. ISDN). This paper discusses technical problems and solutions for users who wish to participate in multicast sessions over dial-in lines and presents our ap-proach, the ISDN Multicast Gateway, which meets the requirements for an application layer multicast router with a very restrictive broadcasting policy and a dynamic tun-nelling mechanism. The ISDN Multicast Gateway allows the transmission of selected multicast sessions over dial-in connections such as ISDN by providing a mechanism to configure a multicast tunnnel dynamically. For each selected media stream the de-sired quality of service parameters can be set interactively, e.g. a certain share of the available bandwidth can be reserved. In order to allow a graceful scaling of video we integrated a simple scaling mechanism for H.261 video streams that controls the temporal resolution of the video.
Additional information: Zählung der Reihe lautet auf dem Titelblatt 498/98

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