ISO/IEC TR 11801-9907:2019

ISO/IEC TR 11801-9907:2019(E), which is a Technical Report, provides definitions for, and examples of, direct attach cabling configurations. This document provides performance specifications for Classes D, E, EA, F, FA, I and II direct attach cabling by reference to ISO/IEC 11801-1.
Informative limits for Class I direct attach cabling to support 5 m short reach mode application according to ISO/IEC/IEEE 8802 3:2017/AMD3, i.e. 25GBASE-T and 40GBASE-T, are provided in Annex A.
Test methods will be provided in the second edition of ISO/IEC 14763-4.
Direct attach cabling connects two pieces of equipment, it has connectors at each end, and no intermediate connecting hardware.