Patent ID: 6563864
Filing Date: 2003-05-13
Classification: H04B

Abstract:
A communications device that accommodates changes in transmission line characteristics over a wire line pair coupling a Plain Old Telephone System (POTS) to a centralized call exchange facility, the device comprising:a transceiver with an analog interface coupled to said wire line pair and arranged to communicate with said centralized call exchange facility; an on/off-hook detector coupled to said analog interface; an impedance analyzer with a first terminal coupled to said on/off-hook detector and a second terminal coupled to said analog interface, the analyzer having an output that is the difference of line impedances between on-hook and off-hook conditions of said POTS; and control logic communicably coupled to said output of said impedance analyzer and configured to dynamically adjust the transmission parameters of said transceiver in response to changes in the transmission line characteristics of said line pair as the POTS goes from an on-hook state to an off-hook state.