Functional number (GSMR)

Full number used within the functional addressing scheme to identify an end user or a system by function or role rather than by a specific item of radio equipment or user subscription. The functional number can be divided into two parts: — functional addressing (process of addressing a call using a specific number, representing the function a user is performing, rather than a number identifying the GSM-R on-board), — location dependent addressing (process of addressing a particular function – typically a signaller – based on the current location of the user – typically a train).