Unified system of design documentation. Graphical symbols in diagrams. Telephone sets, switchboards and switching telephone exchanges
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Integrated digital communication network. Switching and digital transmission systems interface specification
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Integrated digital communication network. Signalling system. Signal definitions
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Telephone exchanges. Information tone signal parameters
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Multicarrier signal conversion equipment for transmission over poor quality channels. Types and parameters
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motocross Devices for automatic telephone exchanges. General technical requirements.
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Automatic telephone exchanges. Reliability requirements and calculation techniques.
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Shelving, wooden and metal, for batteries of communication enterprises. General requirements
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