Circuit arrangement for a telephone station with an earth connection
The invention relates to a circuit arrangement for a telephone station with an earth connection to the central feed for the purpose of suffix dial signalling. The object is to enable the circuit arrangement to operate regardless of which exchange battery pole is connected to earth. To achieve this,...
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| Format: | Patent |
| Sprache: | eng ; ger |
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| Zusammenfassung: | The invention relates to a circuit arrangement for a telephone station with an earth connection to the central feed for the purpose of suffix dial signalling. The object is to enable the circuit arrangement to operate regardless of which exchange battery pole is connected to earth. To achieve this, second polarity reversal protection (full-wave bridge rectifier) is used as an indicator of the exchange battery polarity type, so that different earth paths are created in the telephone station, depending on the polarity. The circuit arrangement is universally suitable for PABX systems. |
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