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.
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Zählung der Reihe lautet auf dem Titelblatt 498/98
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