The paper considers the simulation algorithm for the simulation model HetNet-heterogeneous telecommunication network, including various environments of modern systems of voice and data transmission (cable, wireless), channel-forming elements and interfaces. For simulation and experimental studies, the projected HetNet used: digital VoiP telephones, IP / Ethernet connections to local computer networks, SDH network (at STM-1 level) with SDH / PDH switching equipment, radio modems CNMC. Developed by NetNet, on the one hand, it summarizes modern technologies used in telecommunication networks, and on the other hand, it can be used as an imitation model in the systems of automatics, telemechanics and communications in railway transport (GSM-R)