Switchboard lamp holder. Specifications
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Laryngophones. Methods of electroacoustical measurements
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Data transmission equipment. Asymmetrical circuits of the joint for the two-polar current. General requirements
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Asymmetrical data transmission equipment for bipolar current
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Circuit of the junction between the terminal equipment and the channel termination equipment in public data networks. List of butt chains and their functions
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Reliability of telecommunication facilities. Terms and Definitions
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Maintenance system. Centralized repair bureau . Structure of inspection system of terminal subscriber telephone devices and service lines, information structure and requirements to equipment.
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Equipment cross-connect telecommunication systems for cables with metal conductors. General technical requirements and test methods
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Automatic container telephone exchanges. General technical requirements.
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Joints of terminating subscriber's telephone devices and automatic telephone exchanges. Characteristics and parameters of electrical circuits and signals on the joints
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Linear equipment of subscriber lines of office and industrial automatic telephone exchanges. Operating standards
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Labor protection rules when working at telephone exchanges and telegraphs
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