Ключевые слова: access, backup, broadcast, broadcast transmitter, cable, city, communications, computer, connection, cover, coverage, data, electromagnetic waves, failure, fiber, high frequency, high speed, household, industrial, internet, knot, malfunction, management, massive, net, newest system, operator, optical, provider, radio, rays, reciver, routing, secure, server, services, shortwave, television, transmission, transmitter, wifi,