Transmission signal characteristic, frequency spectrum, present networks character and its organization, fundamental quantities and transmission technique units, telephonemetric for transmission systems and normals, low-frequency transmission systems, low-frequency transmission system fundamental parts, supporting phone systems, frequency plan, fundamental groups and link band creation, digital transmission systems, pulse coding modulation, DM modulation, differential pulse coding modulation, system PCM 30/32, digital higher rank multiplex equipment, systems for broadcasting programme transmission, transmission manners, systems for televise transmission, signal ordering, transmission manners, transmission systems SDH, characteristic STM - 1, signal mapping.