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System and interface circuit which connects a circuit of trunk line type which includes a pair of lines 'tip ring and an installation Telefonica
System and interface circuit which connects a circuit of trunk line type which includes a pair of lines 'tip ring and an installation Telefonica
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机译:系统和接口电路,连接包括一对线的“干线”式主干线和安装Telefonica的中继线型电路
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摘要
An interface system having a single detector to detect incoming signalling including ringing, tip ground, forward loop current, and reverse loop current. Relays and bias control are utilized to perform outgoing signalling and for configuring the system to defect the various incoming signalling states with a single detector.
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