Signaling system 90

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The signaling system 90 ( MAS90 ) from Deutsche Bahn is a system for the transmission and display of data from various hazard warning systems in the German rail network. This system is used, for example, to transmit fire or intrusion reports from electronic interlockings as well as air conditioning or power supply failures from these to the responsible authorities. X.25 is used as the transmission technology.

Due to its classification as a hazard reporting system, MAS90 is subject to monitoring by the Federal Railway Authority under German railway law .

The successor to the MAS90 is the DBMAS .

Examples of monitored systems


  • Peter Reuther: Telecommunication technology using the example of DB AG . In: Railway Infrastructure Manual . Springer, Berlin 2007, ISBN 978-3-540-29581-5 , pp. 701-742 .