A device for inductive multi-injection on multiple conductors, intended for permitting an application of methods for increasing the performance of a communications system on a medium made up of N conductors (2 1 - 2 N) and a reference plane, the device is characterized in that the device, in order to inject communications signals in up to N combinations of the N conductors and obtain injected signals that are orthogonal to each other, comprises: - E signal inputs (1 1 - 1 N, 1c, 1d, 1d1, 1d2, 1pd, 1pd1, 1pd2), where E is between 1 and N, for each one of a plurality of signals to inject in the N conductors; - A inductive couplers, wherein each of the A inductive couplers is around a corresponding one of the N conductors, where A is equal to or greater than twice the number of signal inputs E, where the number of inductive couplers A used in the device depends on a number of injection modes and on a number of conductors used by each one of the injection modes, and where a conductor of the N conductors passes through a gap in an inductive coupler of the A inductive couplers one or more times; and - E signal injection loops, each one of which injects in a differential mode, a pseudo-differential mode or a common mode, wherein a signal injection loop of the E signal injection loops passes through inductive couplers of the A inductive couplers located around conductors of the N conductors on which said signal injection loop is to inject current, and wherein a direction in which the signal injection loop traverses an inductive coupler determines a direction of the current injected in a conductor; wherein selectively a number of turns of each of the E signal injection loops on each of the A inductive couplers and a number of turns of each of the N conductors on each of the A inductive couplers is such that injections are achieved in the differential mode, the pseudo-differential mode or the common mode. - E signal inputs (1 1 - 1 N, 1c, 1d, 1d1, 1d2, 1pd, 1pd1, 1pd2), where E is between 1 and N, for each one of a plurality of signals to inject in the N conductors; - A inductive couplers, wherein each of the A inductive couplers is around a corresponding one of the N conductors, where A is equal to or greater than twice the number of signal inputs E, where the number of inductive couplers A used in the device depends on a number of injection modes and on a number of conductors used by each one of the injection modes, and where a conductor of the N conductors passes through a gap in an inductive coupler of the A inductive couplers one or more times; and - E signal injection loops, each one of which injects in a differential mode, a pseudo-differential mode or a common mode, wherein a signal injection loop of the E signal injection loops passes through inductive couplers of the A inductive couplers located around conductors of the N conductors on which said signal injection loop is to inject current, and wherein a direction in which the signal injection loop traverses an inductive coupler determines a direction of the current injected in a conductor; wherein selectively a number of turns of each of the E signal injection loops on each of the A inductive couplers and a number of turns of each of the N conductors on each of the A inductive couplers is such that injections are achieved in the differential mode, the pseudo-differential mode or the common mode.