Modular element for a mixed electrical power distribution and data communication network of an aircraft, characterized in that it comprises: - a section of an electrical power distribution bus, extending along a length of the modular element; and - a set of data links, this set of data links extending along said length of the modular element, parallel to the bus section, and in that: - the bus section comprises connection points at different locations distributed along its length; - the set of data links comprises connection points at different locations distributed along its length and each arranged in proximity to a connection point of the bus section; - the set of data links comprises a connection point, called cross-connect point (55, 55a, 55b), provided to receive a cross-connect rack; - the set of data links comprises at least one data link between, on the one hand, each of the connection points distributed along its length and, on the other hand, the cross-connect point (55, 55a, 55b); - the bus section and the set of data links each comprise a first point of interconnection (27a, 57a) provided to link the bus section and the set of data links respectively to a bus section and to a set of data links of a first other modular element arranged longitudinally in series with the modular element, at a first longitudinal end of the modular element; and - the bus section and the set of data links each comprise a second point of interconnection (27b, 57b) provided to link the bus section and the set of data links respectively to a bus section and to a set of data links of a second other modular element arranged longitudinally in series with the modular element, at a second longitudinal end of the modular element opposite the first longitudinal end. - a section of an electrical power distribution bus, extending along a length of the modular element; and - a set of data links, this set of data links extending along said length of the modular element, parallel to the bus section, - the bus section comprises connection points at different locations distributed along its length; - the set of data links comprises connection points at different locations distributed along its length and each arranged in proximity to a connection point of the bus section; - the set of data links comprises a connection point, called cross-connect point (55, 55a, 55b), provided to receive a cross-connect rack; - the set of data links comprises at least one data link between, on the one hand, each of the connection points distributed along its length and, on the other hand, the cross-connect point (55, 55a, 55b); - the bus section and the set of data links each comprise a first point of interconnection (27a, 57a) provided to link the bus section and the set of data links respectively to a bus section and to a set of data links of a first other modular element arranged longitudinally in series with the modular element, at a first longitudinal end of the modular element; and - the bus section and the set of data links each comprise a second point of interconnection (27b, 57b) provided to link the bus section and the set of data links respectively to a bus section and to a set of data links of a second other modular element arranged longitudinally in series with the modular element, at a second longitudinal end of the modular element opposite the first longitudinal end.