... function of voice and data transfer on both GSM-R and 450MHz mode.CIR unit is made up of ... the Control unit,GPS unit,Record unit,GSM-R voice unit,GSM-R data unit,450MHz function unit,Power unit. ... -in and forced-release etc.(2)Control the GSM-R data unit by wireless data transfer to get the ... updating,data export, can be solved by Network interface or USB interface.1.2.2 MMIMMI is equipment for driver. ...