... for driver. It can provide the function of voice and data transfer on both GSM-R and ... Control unit,GPS unit,Record unit,GSM-R voice unit,GSM-R data unit,450MHz function unit ... to get the GSM-R voice operation, for example point-to-point call,group call,function number register/ logout,break ... )Control 450MHz function unit to get the relevant voice and data communication operation of known analog order.( ...