Patent ID: 8059703

Claim:
A system for determining a suitable impedance for a modem, the system comprising: a selecting module configured for selecting an impedance of the modem; a setting module configured for setting a signal frequency of the modem; an adjusting module configured for adjusting the signal frequency by an adjustment frequency each time until the signal frequency reaches a predetermined frequency; a sending module configured for sending signals with the signal frequencies to a telephone; a receiving module configured for receiving feedback signals from the telephone; a computing module configured for computing a decibel value of each of the feedback signals and further computing a total decibel value of the feedback signals under each selected impedance; an impedance determining module configured for determining a suitable impedance from the impedances of the modem according to a minimum total decibel value when all the impedances of the modem have been selected; and at least one processor for executing the selecting module, the setting module, the adjusting module, the sending module, the receiving module, the computing module, and the impedance determining module.