PD IEC/TR 61156-1-2:2009+A1:2014 - Page 2

Multicore and symmetrical pair/quad cables for digital communications. Electrical transmission characteristics and test methods of symmetrical pair/quad cables | Status: Superseded, Withdrawn

1 Scope This technical report is a revision of the symmetrical pair/quad electrical transmission characteristics present in IEC 61156‑1:2002 (Edition 2) and not carried into IEC 61156‑1:2007 (Edition 3). This technical report includes the following topics from IEC 61156‑1:2002:

• - 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 open/short-circuit method;
• - Annex C covering unbalance attenuation.