Patent ID: 6980739

Claim:
A method for a gain control of a fiberoptic repeating system comprising: determining whether a control signal of a base station has been received; outputting a locally generated modulated MODEM signal at a predetermined level based on whether the control signal of the base station has been received, and if the control signal has been received outputting the MODEM signal at a level different from said predetermined level; if the control signal has not been received, mixing from a master repeater the locally generated modulated MODEM signal of said predetermined level with a RF signal and transmitting the mixed signal through an optical cable; detecting at a slave repeater a modulated MODEM signal level from the mixed signal transmitted by the master repeater; comparing, at the slave repeater, the detected modulated MODEM signal level with a reference level and obtaining a difference between the levels, wherein the reference level corresponds to said predetermined level unless the master repeater transmits the control signal of the base station; and adjusting a gain of an amplifier for the RF signal in the slave repeater by using the obtained difference to calculate the gain adjustment, wherein the modulated MODEM signal is generated independently from the RF signal.