Ключевые слова: background, cable, case, checking, close, communication, computer, connection, cord, cushion, data, digital, equipment, fiber, hand, hardware, high, industry, information, installation, internet, light, measuring, meter, modern, network, occupation, optic, optical, patch, person, power, professional, setup, signal, source, spectrum, stripping, technician, technicians, technology, test, tester, transmission, up, welding, white, wire, work, yellow,