Telephonic communications – Subscriber line or transmission line interface
Reexamination Certificate
2005-03-22
2005-03-22
Le, Huyen (Department: 2643)
Telephonic communications
Subscriber line or transmission line interface
C379S391000, C379S392000, C379S402000
Reexamination Certificate
active
06870928
ABSTRACT:
A line interface couples signals between a data transceiver and a transmission line having a load impedance Z. The line interface includes a transformer, a driver circuit for supplying a transmit signal from the data transceiver to the transformer, and a receiver circuit for receiving a receive signal from the transformer. The transformer includes a first port coupled to the transmission line, a second port coupled to the driver circuit, a third port coupled to the receiver circuit, a first winding part having a turns ratio of 1: n, where n>1, for coupling the transmit signal from the second port to the first port, and a second winding part having a turns ratio of 1: m, where m<n, for coupling the receive signal from the first port to the third port.
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Bicakci Ara
Conroy Cormac S.
DeCelles John
Lee Sang-Soo
Sheng Samuel W.
Le Huyen
Pham Tuan
Thelen Reid & Priest LLP
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