This part of ISO/IEC 11801 a) specifies the transmission performance for balanced cabling channels to support 2,5GBASE-T and 5GBASE-T, b) specifies the methods to assess whether installed Class D and Class E channels meet 2,5GBASE-T and 5GBASE-T requirements, c) provides mitigation techniques to improve the performance of an existing installation to meet the 2,5GBASE-T and 5GBASE-T requirements, d) provides cabling recommendations for new installations. NOTE 1 – The channel transmission performance specified in this document is derived from IEEE Std 802.3bz:2016. NOTE 2 – IEEE Std 802.3bz:2016 specifies requirements beyond the frequency range specified for Class D of ISO/IEC 11801:2002 and additional parameters to those specified for Class D and Class E cabling in ISO/IEC 11801:2002. NOTE 3 – This document does not re-specify Class D and Class E cabling of ISO/IEC 11801:2002.