An ATM scheduler supporting all adaptation alternatives for real-time services

This paper presents enhancements of the delayed frame queueing (DFQ) ATM transmission and multiplexing strategy to provide a wide range of explicit and nontrivial bounds for queueing jitter. This enables a wide range of adaptation alternatives for real-time ATM services such as voice over ATM. Network simulation results indicate that DFQ can offer a very tight jitter bound, not exceeding 1 ms, with no significant increase in cell loss compared to the case where a trivial jitter bound of 13 ms is guaranteed. We discuss many examples of how this has major implications on the preferred alternatives, chosen by clients, for implementing various network adapter functions such as source clock recovery for voice.