Patent ID: 8837946

Claim:
A data transmission apparatus for use in a separate-type base station, the data transmission apparatus comprising: a digital unit configured to generate first data that includes transmission method information indicating a selected transmission method and data to be transmitted; a time-division synchronization control unit configured to, in response to the selected transmission method being time-division multiplexing (TDM), generate second data by including synchronization information for transmitting the first data using TDM in the first data; and a wavelength conversion unit configured to convert at least one of the first data and the second data into one or more wavelength optical signals using a predefined wavelength or a predefined group of wavelengths and transmit the wavelength optical signals to one or more radio stations, wherein the digital unit is further configured to, in response to a selection signal being received via a user input unit, generate at least one of TDM data, which includes transmission method information indicating TDM, TDM/WDM data, which includes transmission method information indicating both TDM and WDM, and WDM data, which includes transmission method information indicating WDM, as the first data based on the selection signal.