Patent ID: 7239808

Claim:
A subscriber interface device for transmitting a communication signal and a broadcasting signal to each subscriber in a communication-broadcasting convergence FTTH (Fiber To The Home) system having an OLT (Optical Line Terminal) for transmitting digital broadcasting information received over an external broadcasting network and received external data communication information, an ONU (Optical Network Unit) for separating optical signals received from the OLT into broadcasting signals and communication signals, converting the broadcasting and communication signals to electrical signals, processing upstream information received from subscribers, and optically transmitting the broadcasting and communication signals selectively according to the individual subscribers, and an ONT (Optical Network Terminal) for converting an optical signal received from the ONU to an electrical signal, splitting the electrical signal for respective services, and transmitting the split electrical signals to a subscriber terminal, wherein the subscriber interface device comprises: a subscriber interface transmitter arranged in the ONU, for modulating a first predetermined number of broadcasting signals selected by the subscriber among broadcasting signals received from the OLT, combining a baseband communication signal received from the OLT with the modulated broadcasting signals, and optically transmitting the combined communication-broadcasting signal; and a subscriber interface receiver arranged in the ONT, for splitting the combined communication-broadcasting signal received from the subscriber interface transmitter, filtering the split signals to respective frequency bands, demodulating the filtered broadcasting signals, transmitting the demodulated broadcasting signals to a monitor of the subscriber, and transmitting the filtered communication signal as a baseband signal to a communication terminal of the subscriber.