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Variable bitrate connections are offered in packet-switched networks, with ATM
being the one better supporting it with QoS guarantees, such as peak bitrate and
average bitrate constraints. Even with ATM, however, the long-term variations of
these constraints, do not alone guarantee the effective transmission of
unsupervised, or open-loop encoded, digital video. For
live video transmission these variations cannot be reliably estimated, and could
violate the traffic contract.
Isaac Kokkinidis
1998-08-27