IEC 61156-12:2025 pdf download,Multicore and symmetrical pair/quad cables for digital communications – Part 12: Symmetrical single pair cables with transmission characteristics up to 1,25 GHz – Work area wiring – Sectional specification.
IEC 61156-12:2025 outlines specifications for cables designed for single balanced pair cabling, applicable in office, home, and industrial settings as described in ISO/IEC 11801-1:2017 and ISO/IEC 11801:2017/AMD1. One notable application of these cables is in the 1000BASE-T1 standard, as referenced in ISO/IEC TR 11801 9906. The transmission characteristics of these cables are defined for frequencies up to 1.25 GHz at a temperature of 20 °C. Specifically, the T1-B type cable is rated for frequencies ranging from 0.1 MHz to 600 MHz, while the T1-C type cable extends from 0.1 MHz to 1.25 GHz. Depending on the MICE (Mechanical, Ingress, Climatic, and Electromagnetic) environment and installation conditions, users can choose between unscreened or screened cables. A blank detail specification is provided in Annex A.
This second edition supersedes the first edition published in 2021 and represents a technical revision. Key updates in this edition include: a) the addition of a new cable type to support T1-C generic single pair cabling up to 1.25 GHz; b) the introduction of low-frequency coupling attenuation as a critical parameter for assessing screening efficiency at frequencies below 30 MHz. These changes enhance the overall performance and applicability of the cables in various environments.