Longitudinal Signals in DSL

In English The purpose of this contribution is twofold. First, we revisit the longitudinal component (also referred to as common-mode component, asymmetric component or antenna-mode component) occurring at the receive side of a
twisted-pair loop. Second, we propose a simple setup for RFI tests that captures reality more accurately than performing differential-mode and common-mode tests separately. In essence, we agree with and support the test environments proposed in 123. We stress the fact that differential-mode and common-mode signals
should be generated jointly in order to account for their correlation.