der foretages opgradering af en eksisterende radiodel i en mobilenhed til togkontrol, og dette ændrer funktioner, ydeevne og/eller grænsefladerne i det eksisterende nedarvede system (jf. denne TSI's bilag B).
any existing radio part of a CCS onboard assembly is upgraded, where this would change the functions, performance and/or interfaces of the existing legacy system (as referred to in annex B of this TSI).