The system includes following parts: near end and far end monitoring units in use for sending out and receiving monitored data; near end and far end protocol processing units in use for carrying out protocol processing for monitored data; near end and far end frequency shift keying modulators in use for modulating monitored data processed by proper protocol to radio frequency (RF) signal, or demodulating the received RF signal to protocol-processed monitored data; coupler and laser, through coupler being coupled to laser, RF signal is converted to light signal to be sent out; detector and amplifier are in use for converting light signal to electric signal by the detector, and amplifying electric signal by the amplifier. The invention also discloses method for integrating network managementchannel in RF light transmission module.