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This leaflet defines the elements used for international telephone communications and the rules to be observed in establishing international circuits. The technical characteristics of the analogue and digital transmission systems constituting these circuits are also specified. Reference is further made to specifications relating to line systems, such as the overhead line, cables and directional radio links. Finally, the maintenance procedures to be applied are dealt with. This leaflet forms part of a set, including: UIC Leaflet 750, UIC Leaflet 753-2. There is also a reference, in point 2.3.4, to UIC Leaflet 911-4.