From the International Electrotechnical Commission webstore:
“IEC/TR 61156-1-5:2013(E), which is a Technical Report, describes correction procedures for the measurement results of return loss and input impedance.”
IEC/TR 61156-1-5:2013(E): Multicore and Symmetrical Pair/Quad Cables for Digital Communications – Part 1-5: Correction Procedures for the Measurement of Return Loss and Input Impedance
