Circuit arrangement for a telephone station with earth connectio

Details Circuit arrangement for a telephone station with earth connectio Circuit arrangement for a telephone station with earth connectio

1988-02-08

1989-06-20

Ng, Jin F.

Telephonic communications

Supervisory or control line signaling

Using line or loop condition detection

379387, H04M 100

Patent

active

048415685

ABSTRACT:
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.

REFERENCES:
patent: 4251693 (1981-02-01), Christiansen
patent: 4313037 (1982-01-01), Shepard
patent: 4614843 (1986-09-01), Coulmance

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