KF-X5 Structure:single-strand bare copper ,polythene insulated two insulated wire twist together as couple,polythene or PVC or non-haloge jacket. Standards:GB YD/T 1019-2001,US.Standards ANSI/EIA/TIA-568-B.2-2001,It is also apply to ISDN.ATM155 Mpbs,622Mbps and 100Mbps TPDDI in high speed Internetand IEEE 802.3/5/12.