IEEE will release the standard for 10Gbps copper cable Ethernet network, termed 10GBASE-T, in 2006. It's also called Augmented Category 6.Category 7 also supports 10G transmission. For the deployment of 10Gbps on an augmented Cat 6 cabling system, one key issue is the testing and management of the noise coupled between the adjacent link segments. An example of this is called alien crosstalk. This article presents alien crosstalk testing, including the background, challenges, field testing approaches and mitigation recommendations.