Such media as copper cables are essential for the network to work. In this part of the course we discuss the following: 10,100, 1G, 10G 40G i 100B BASE-x technologies, UTP and STP twisted-pair cable, categories 5, 5e, 6, 6A and 7 of cables and passive accessories of the network, RJ-45 and RJ-11 plugs, sequences of colours of cables and connectors, different types of cables, dynamic parameters of transmission paths. The micro-course is essential for installators and desigmers of structural cable systems.