Real-time Multimedia Transmission over a Dynamic Synchronous Transfer Mode Network
Jonas Larsson · 1998
In this thesis we design and implement a system to transport multimedia traffic (e.g., video and audio) over a Dynamic synchronous Transfer Mode (DTM) network. The architecture of DTM is based on Time Division Multiplexing (TDM) and is hence a circuit switched network. DTM has been designed to be a good carrier of traffic demanding guaranteed Quality of Service. The implemented system is based on the Client-Service paradigm and the media transport takes advantage of DTM’s ability to use physically separated channels for the media. An IP to DTM channel mapping mechanism has been implemented to enable this. Measurements are carried out to investigate the packet jitter an application might experience over the DTM setup available during the thesis. We disturb the measured stream with parallel traffic and investigate its effect on the packet jitter. A comparison is done with an Ethernet and we notice that DTM is less sensitive than Ethernet to the interference. The jitter is however observed to be relatively high when the interfering traffic load is low. We give an explanation to this and suggest actions that could remedy the problems.