Patent ID: 6236677
Filing Date: 2001-05-22
Classification: H04J,H04L,H04Q

Abstract:
A system for communication between a first host having a modem and a respective computer and a second host having another modem and another respective computer wherein each modem is connected by a PSTN line to a central station, each first and second hosts respectively comprising:a D/A converter means connected to said respective computer and central station for converting an outgoing digital signal from said respective computer to an outgoing analog signal for transmission to said central station;an A/D converter means connected to said respective computer for converting an incoming analog signal received from said central station to an incoming digital signal delivered to said respective computer;said incoming and outgoing analog signals each being a succession of amplitudes at a sampling rate;said incoming and outgoing digital signals being a succession of groups of bits;a transmit clock connected to said D/A converter means to control rate of conversion of said groups of bits of said outgoing digital signal to corresponding amplitudes of said first analog signal at said sampling rate;a receive clock connected to said A/D converter means to control rate of conversion of said amplitudes of said incoming analog signal to corresponding groups of bits of said second digital signal at said sampling rate;means for synchronizing said transmit clock and receive clock of said modem with a clock signal from said central station, said clock signal having said sampling rate;said modem having a feedback means for suppressing reflected analog signals from said central station enabling said first host in operable combination with said second host and central station to communicate digital signals in fill duplex mode.