a system for synchronizing clocks includes : a gps receiver module adapted to extract clock information and tod information from a received gps signal , to generate and output a clock signal and tod data to a first base transceiver station and a base transceiver station of a next stage , the gps receiver module being arranged within the first base - station transceiver ; and a clock module adapted to generate a clock signal and tod data synchronized with the clock signal and the tod data of the first base transceiver station by performing a delay correction with one of the gps receiver module of the first base transceiver station or a base transceiver station of a previous stage , and to output the clock signal and the tod data to its base transceiver station and a base transceiver station of a next stage , upon the clock module receiving a clock signal and tod data from one of the gps receiver module of the first base transceiver station or the base transceiver station of the previous stage through a daisy chain , the clock module being arranged within a base transceiver station other than the first base - station transceiver .