Circuitry for interfacing telecommunications equipment to a comm

Details Circuitry for interfacing telecommunications equipment to a comm Circuitry for interfacing telecommunications equipment to a comm

1992-09-28

1993-12-14

Dwyer, James L.

Telephonic communications

Subscriber line or transmission line interface

Hybrid circuit

379398, 379404, 379340, 379394, H04B 158

Patent

active

052710602

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: 4056688 (1977-11-01), Stiefel
patent: 4277655 (1981-07-01), Surprenant
patent: 4297536 (1981-10-01), Bachner
patent: 4498018 (1985-02-01), Lofmark
patent: 5187742 (1993-02-01), Moran, III et al.

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