Circuitry for interfacing telecommunications equipment to a comm

Telephonic communications – Subscriber line or transmission line interface – Hybrid circuit

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Details

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.

REFERENCES:
patent: 3982080 (1976-09-01), Ukeiley
patent: 4096361 (1978-06-01), Crawford
patent: 4178569 (1979-12-01), Reutter et al.
patent: 4278848 (1981-07-01), Rizzo et al.
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

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