The methodical instructions correspond to the program of discipline «Teletraffic Theory in Telecommunications», Module 4.1. In accordance with the program expounded: main positions and analysis methods of Teletraffic theory in telecommunications which procedures of planning of the telecommunication systems and networks are based on. The mathematical models of the distribution information systems are considered with losses, with order and priorities. Research methods of these systems are brought in the conditions of idealizing model of Poisson flow and real streams of requirements in multi-service communication networks. Study guides are intended for students to daily, distant and distance forms of education for the bachelors degree obtaining by students in Telecommunication aria . Tasks are presented for independent preparation; cycle from seven laboratory works, allowing students to fasten theoretical material, control questions for quality of the got knowledge control.