| 摘要 |
In order to produce a power connection relay (PCR) for telephone networks operated according to the ISDN system, signal generators (power alarms, horns, lights) supplied with power by the PCR being activatable with ringing cadence, it is proposed that the PCR (A), the connection terminals for the signal generator, the Y interface and the voltage supply be arranged in a housing (1), the PCR being connected to the voltage supply terminals (SV1, SV2) and a transistor (T1) being inserted in this circuit as a switch, its base being controlled by an optocoupler (6) which is inserted as a DC-isolating element between the transistor base and the Y interface terminals (W, M1). <IMAGE>
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