Speech transmission over the radio communication. Requirements for speech legibility and methods of articulation measurements
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Unified automated country communication system. Channels of acoustic telegraphy with frequency modulation. Types and basic electric parameters
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Signal-conversion equipment for radio voice-frequency channels. Types and basic parameters
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External circuits for start-stop apparatuses for alphabetic telegraphy, 5-element code. Types and basic parameters
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Protection of telecommunication and installations and personnel against lightning
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Line communication sets. Protection circuits from dangerous voltages and currents arisen at lines. Specifications
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Electromagnetic compatibility of technical equipment. Immunity of wire communication equipment to electromagnetic disturbances. Requirements and test methods
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Line transmission path equipment of submarine optical fibre transmission systems. Types and basic parameters
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See the state registration book
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Telephone exchanges. Voice-frequency signal generators. Technical requirements.
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Equipment of terminal stations and linear digital path of systems of transmission via the fibre-optical cable. The list of measured parameters.
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Equipment of long-distance communication. Filters electromechanical small-sized with magnetostrictive converters. Types. Design and dimensions.
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