Telephonic communications – Subscriber line or transmission line interface – Hybrid circuit
Patent
1990-01-12
1993-02-16
Dwyer, James L.
Telephonic communications
Subscriber line or transmission line interface
Hybrid circuit
379398, 379402, 379400, H04B 158
Patent
active
051877422
ABSTRACT:
Measuring the programming resistor in a data jack by placing the resistor in an AC voltage divider circuit via a transformer. An AC voltage (preferably generated by the modem's own transmitter circuitry) is applied to the voltage divider circuit, and an AC voltage measurement (preferably made by the modem's A/D converter) provides the resistance of the programming resistor. Matching the low-pass filter impedance characteristic of a local loop with a network having a matching low-pass filter characteristic, while also compensating the received signal with a compensation network having a high-pass filter characteristic, to reduce the frequency dependent gain effects caused by the matching network and/or the local loop.
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patent: 4178569 (1979-12-01), Reutter et al.
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patent: 4368361 (1983-01-01), Chung et al.
patent: 4498018 (1985-02-01), Lofmark
patent: 4746881 (1988-05-01), Suzuki et al.
patent: 4807283 (1989-02-01), Pyhalammi
patent: 4989243 (1991-01-01), Choi
Moran III John L.
Schissler L. Robert
Codex Corporation
Dwyer James L.
Stockley Darleen J.
Woo Stella L.
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