Longitudinal balance calibration for a subscriber line...

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

Reexamination Certificate

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Details

C379S399010, C379S402000

Reexamination Certificate

active

07925005

ABSTRACT:
A method of calibrating longitudinal balance for a subscriber line interface circuit includes providing a first and a second driver of a differential driver pair for driving a subscriber line. An output of each of the first and second drivers is coupled to a common output. The common output is coupled to an input of the first driver. The gain of at least one of the first and second drivers is adjusted until a calibration signal (V1) present at the input of the first driver is substantially the same as a calibration signal (V2) present at the input of the second driver.

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