Impedance compensation in interfacing a modem to a telephone...

Details Impedance compensation in interfacing a modem to a telephone... Impedance compensation in interfacing a modem to a telephone...

2005-06-07

2005-06-07

Nguyen, Duc (Department: 2643)

Telephonic communications

Substation or terminal circuitry

Impedance matching or line equalizing

C379S398000

Reexamination Certificate

active

06904144

ABSTRACT:
According to a disclosed embodiment, the ideal magnitude and phase of an ideal impedance for interfacing a modem with a telephone line is determined. This ideal impedance can be determined in the presence of an external impedance load and associated circuitry, such as an ADSL modem and accompanying POTS splitter. Thereafter, a model for an interface circuit inside the modem is utilized to arrive at an appropriate impedance for an impedance network inside the interface circuit. As an example, the interface circuit can be a DAA circuit inside a V.90 modem. Then, a relationship between the ideal impedance and an input impedance of the impedance network is established. Thereafter, the impedance network is synthesized to that the relationship between the input impedance of the impedance network and the ideal impedance is in fact satisfied. The impedance network can be, for example, a circuit comprising at least one capacitor.

REFERENCES:
patent: 5802169 (1998-09-01), Frantz et al.

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