The UIC Leaflet 917-1 sets out the technical characteristics of an international interconnected data
transmission network together with the procedures governing integration of the various national
networks ,n this international interconnected network.
There are several solutions used by the Railways:
1. One solution is based on the ITU-TX. 75 Recommendation. The set of X.75 configuration values
that must be respected in order to achieve international connectivity among data transmission
networks is defined. The Leaflet specifies the addressing scheme based on Data Network
Identification Codes (DNIC).
2. Another solution is based on Internet Protocol (IP), where MPLS technology is applied. The
procedure how the basic MPLS structure and configuration shall be achieved is defined in the
Leaflet.