Explicit Congestion Notification (ECN) transfers a clear
indication of congestion through the network and, therefore,
gives a possibility to construct closed-loop control of
effective transmission rate. In the paper, a simulation model
of ECN-capable multicast multimedia delivery in ns-2
environment is discussed. The model includes complete
ECN-capable network infrastructure (sender, receivers,
network nodes). Special emphasis is placed on the core of the
system, the ECN-capable RTP protocol. Simulation results
confirm credibility of the model.