Multicast routing in internetworks and extended LANs
SIGCOMM '88 Symposium proceedings on Communications architectures and protocols
Measuring perceived quality of speech and video in multimedia conferencing applications
MULTIMEDIA '98 Proceedings of the sixth ACM international conference on Multimedia
The good, the bad, and the muffled: the impact of different degradations on Internet speech
MULTIMEDIA '00 Proceedings of the eighth ACM international conference on Multimedia
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Internet Protocol (IP)-based videoconferencing technology can offer a low-cost means of collaboration and resource sharing on a national or global scale. This is potentially of interest to many users, especially in non-profit sectors such as education and healthcare. However, it has been questioned whether a best-effort network service can provide the reliability and quality required to support teaching and learning activities. To evaluate the technology, a 9-month pilot project of distributed teaching activities between 13 UK universities was set up. We present and discuss the issues involved in gathering and analysing data in a large-scale project with real users engaged in learning activities. The results suggest that incorrect equipment set-up and user behaviours cause most of the perceived problems, rather than network irregularities.