When audio or video is transmitted over an Ethernet network, the data is usually transmitted in bursts of packets with long idle times in between bursts. SimEvents is a good tool for modeling those types of sources and studying the effects of queue size and server times on the audio or video transmission.
This model uses an internet radio file captured from Ethereal as a source, and transmits data with the packet lengths and source times defined in that file. You can study the effects of changing the FIFO Queue size or serviceTime values on the number of dropped packets for the selected source.

To run this model you need to download the Ethernet Header Extraction Tool (posted on MATLAB Central). After you download that tool, you can run this model by following the instructions on the model's diagram.