ADDITIONAL UNIT FOR TRANSMISSION CIRCUIT OF AUTOMATIC TELEPHONE

The utility model relates to an additional unit for the transmission circuit of an automatic telephone, the switching control of a relay, a switching coil and a switch is used to improve quality and provide the single wire (one wire one grounding) or double wire automatic telephone. In villages and...

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Bibliographic Details
Main Authors YE XINTAO, HE JIANHUA
Format Patent
LanguageEnglish
Published 21.02.1990
Edition5
Subjects
ELECTRIC COMMUNICATION TECHNIQUE
ELECTRICITY
TRANSMISSION
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Summary:The utility model relates to an additional unit for the transmission circuit of an automatic telephone, the switching control of a relay, a switching coil and a switch is used to improve quality and provide the single wire (one wire one grounding) or double wire automatic telephone. In villages and mountain areas using open wires to provide the automatic telephone, the utility model does not increase the investment of the circuit reconstruction.
Bibliography:Application Number: CN1989208841U