To aid users in testing to TIA TSB-155-A, we are pleased to offer a statement of works document. It can be downloaded free of charge by clicking here. You will need Microsoft Word to view the document. Also available: ANSI/TIA-568-C.2 Category 5e ANSI/TIA-568-C.2 Category 6 ANSI/TIA-568-C.2 Category 6A TIA-TSB-155-A is not a standard. The purpose of this Telecommunications System Bulletin is to determine the suitability of an existing category 6 cabling installation to support 10GBASE-T. If you are specifying a new installation designed to support 10GBASE-T up to 100 m (328 ft), you should be looking to ANSI/TIA-568-C.2 Category 6A.   Due to Alien Crosstalk considerations, you may not be able to run 10GBASE-T over the full length of your cabling system. You may have heard that 10GBASE-T will not run beyond 55 meters on UTP cable. TIA TSB-155-A states: "10GBASE-T should operate over channel lengths of up to 37 meters of Category 6 cabling, and should operate over channel lengths between 37 and 55 meters of Category 6 cabling depending on the alien crosstalk environment. Channel lengths over 55 meters may require mitigation."    What this means is that no one really knows. There are so many variables in the cabling system. We have observed links as long as 60 m that meet the PS AXtalk requirements and links of 30 m which do not. The only way of knowing if a link will support 10GBASE-T is to test it for both in channel parameters such as NEXT, RL etc to 500 MHz AND for Alien Crosstalk. TIA TSB-155-A defines the testing method for PS AXtalk and is referenced in the TSB-155 statement of works document.