Method and apparatus for generating a ringing signal

In generating a ringing signal of predetermined frequency and shape between the A- and B-wires to a subscriber's station in a telephone network, the ringing signal is directly injected in or superposed on the DC-levels of the wires. A voltage difference converting device converts any voltage di...

Ausführliche Beschreibung

Bibliographische Detailangaben

Hauptverfasser:	WIKLUND, SVEN, BARKAROE, STEFAN, RANDAHL, TORBJOERN, WALLIN, BERNDT
Format:	Patent
Sprache:	eng
Schlagworte:	ELECTRIC COMMUNICATION TECHNIQUE ELECTRICITY TELEPHONIC COMMUNICATION
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