Transmission bridge for a subscriber set

Details Transmission bridge for a subscriber set Transmission bridge for a subscriber set

1980-07-16

1982-03-09

Brown, Thomas W.

179 16AA, 179 70, 179170D, H04M 1900

Patent

active

043190936

ABSTRACT:
The invention concerns feeding current to a subscriber set. In addition to an isolation transformer (T) the transmission bridge includes a measuring circuit (4) connected to the subscriber line, and a receive circuit (7), with the measuring circuit connected to the receive circuit via an impedance adjusting circuit (6). The receive circuit is connected to a receive terminal (10) and is arranged to forward the signal received therefrom to the transformer. The bridge also includes a send circuit (9), likewise connected to the measuring circuit and receiving the signal at the receive terminal via a balance circuit (8) for cancelling the signal delivered by the send circuit while the subscriber set is receiving. Application to telephony.

REFERENCES:
patent: 4241239 (1980-12-01), Pernyeszi

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