SCHALTUNGSANORDNUNG FUER EINE FERNSPRECHSTATION MIT ERDEANSCHALTUNG AN DIE ZENTRALE SPEISUNG

A circuit arrangement for a telephone station with earth connection to the central supply device for the purpose of post-dialing signaling, operates independently of whether the negative or the positive pole of the exchange battery is earthed. This is achieved by provided that, on the actuation of the earthing key, the earth connection of the telephone is connected to the unearthed pole of the exchange battery via a transistor network which functions differently in dependence upon the polarity of the exchange battery earthing. The circuit arrangement is universally suitable for PBX exchanges.