ADSL SERVICE DEVICE USING ARTIFICIAL SATELLITE

摘要

PURPOSE: An ADSL(Asymmetric Digital Subscriber Line) service device using an artificial satellite is provided to transmit data through a telephone line and to receive data through the artificial satellite, so that an upload speed as well as a download speed is raised. CONSTITUTION: In a subscriber device(900), a satellite receiving unit(200) receives signals of a predetermined downstream channel from a satellite(400). A filtering unit(150) filters signals in a frequency band of the downstream channel and filters signals in a frequency band of an upstream channel through a telephone line. A modem(110) demodulates the filtered downstream channel signals and modulates the upstream channel signals. The subscriber device(900) transmits upstream channel data to a telephone office(700) through the filtering unit(150). The telephone office(700) transmits downstream channel data to be transmitted to a subscriber to a satellite data station(600). The satellite data station(600) transmits the received downstream channel signals to a satellite transmission antenna(500). The downstream channel signals passes through the satellite(400) and are received to a satellite receiving antenna(300), thus being inputted to the satellite receiving unit(200).