C-Corp 4 ports Optical Receiver and Transmitter, Aerial, 9dB, 470862Mhz is a kind of new high quality CATV network products. It adopts the reasonable combination of GaAs NEC amplifying module, AGC/MGC function. When input optical power is in the range of -6~+2dBm, output level will be stable and it is characterized by high performance index. Single chip microcomputer controlling LED numeral pipe displays each parameter, which makes CATV network project very easy to debug. Digital and analogue signals can be transmitted at the same time. This is the priority choice in HFC network system construction.