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Multicore and symmetrical pair/quad cables for digital communications - Electrical transmission characteristics and test methods of symmetrical pair/quad cables Ingestion-build-78747 Application of fine bubble technology1 Scope This technical report is a revision of the symmetrical pair quad electrical transmission characteristics present in IEC 611561: 2002 (Edition 2) and not carried into IEC 611561: 2007 (Edition 3). This technical report includes the following topics from IEC 611561: 2002: the characteristic impedance test methods and function fitting procedures of 3. 3. 6; Annex A covering basic transmission line equations and test methods; Annex B covering the