Schneider six modules as cabling system is an important part of the problem but has not been tested attention. Test question module is only mentioned in the last two years in the standard, in ① TIA / EIA-568-A-4-1999: 100 ohm four pairs of cable transmission delay and delay deviation from the norm ② TIA / EIA-568-A -5-2000: 100 Ohm 4 pairs enhanced category 5 cabling specification ③ TIA / EIA-568-B Part 2: Standard 100 Ω balanced twisted pair components has published several standards were involved Ca.5, Cat .5e module test methods and requirements, TIA / ELA-568B.2-1 six cabling standard provides specific requirements for the module.