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Safety Requirements for the Technical Interoperability of ETCS in Levels 1 & 2 REF : SUBSET-091 5. ETCS SYSTEM PERSPECTIVE ON TRANSMISSION SUBSYSTEMS 5.1 Corruption of messages 5.1.1.1 According to EN 50159 2, it is possible to protect data communication with measures that mitigate errors inside a transmission channel whose characteristics are not completely known. 5.1.1.2 In the analysis of such a transmission channel, see e.g. Subset-081 - Transmission Path FMEA, it is sometimes useful to consider part of the sender and receiver functionality as belonging to the non-trusted transmission channel, according to EN 50159 indications.
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