Patent ID: 7359408

Claim:
An apparatus for measuring and compensating propagation delay between a main base station and a remote base station according to a synchronous digital hierarchy (SDH) standard, the main base station being connected to the remote base station by an optical cable, the apparatus comprising: an SDH processing unit for inserting a test pattern into an overhead part of an SDH frame to transmit the SDH frame to the remote base station and for receiving the SDH frame looped back by the remote base station to detect at least one frame alignment word (FAW) from the SDH frame of the remote base station; a controller for producing a value of propagation delay between the main base station and the remote base station by adding propagation delay measured according to a count value of round trip delay of the SDH frame containing the test pattern to a delay error calculated from detection information of the FAW; and a modulator and demodulator (MODEM) for compensating propagation delay of a baseband signal to be transmitted to the remote base station in response to the propagation delay value produced by the controller.