ADSL MODEM DEVICE AND A COMMUNICATION METHOD THEREOF, PARTICULARLY WITH REGARDS TO EXACTLY DETECTING A COMMUNICATION DISTANCE UP TO OTHER ADSL MODEM DEVICE, AND ENABLING ADSL COMMUNICATION IN LONGER RANGE

摘要

PURPOSE: An ADSL modem device and a communication method thereof are provided to predict a communication distance up to other ADSL modem device by detecting a receiving level of a REVERB signal, and to refer to a table which shows an attenuation of a signal energy, so that the signal energy can concentrate on a low frequency band. CONSTITUTION: If a 'C-REVERB1' signal is received(ST801), a remote ADSL modem device decides whether a signal energy of a carrier index is attenuated at more than 53dB, compared to a signal energy of other carrier index(ST802). If so, a communication range is predicted at more than 5km(ST804). The remote ADSL modem device decides whether the signal energy is attenuated at more than 96dB(ST805). If not, the communication range is predicted at more than 5km and less than 9km(ST806). If the signal energy is at more than 96dB, the communication range is predicted at more than 9km(ST807).