National automatic telephone communication system. Terms and definitions
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Electroacoustic anti-noise devices for telephone communication systems. Terms and definitions
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Control unit of switching communication. Terms and definitions
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United automatic telecommunication network. Terms and definitions
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Telegraph communication. Terms and definitions
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Apparatus for alphabetic telegraphy. Terms and definitions
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Integrated digital communication network. Terms and definitions
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Frequency-division carrier transmission system equipment. Terms and definitions
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Functional blocks of control unit of switching communication. Terms and definitions
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Channel switching and message switching in telegraph communication. Terms and definitions
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Facsimile apparatus. Terms and definitions
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Optical fibre data transmission systems. Terms and definitions
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