https://community.hpe.com/t5/operating-system-hp-ux/lan-cabling/m-p/4306446#M338701 You mean can you use a cat6 GbE cable in a 100BT port? Yes you can, but of course you'll only get 100BaseT speed. The physical media is backwards compatible.<BR /><BR />If its terminating into a GbE port on a switch you might need to hard set the speed to 100FD on both the host and the switch.<BR /><BR />HTH<BR /><BR />Duncan Fri, 14 Nov 2008 15:04:27 GMT Duncan Edmonstone 2008-11-14T15:04:27Z https://community.hpe.com/t5/operating-system-hp-ux/lan-cabling/m-p/4306445#M338700 I have a question the lan card installed on my system is "HP A5506B PCI 10/100Base-TX 4 Port"<BR />can I use the copper 1000MB/FD cabling with this card. will it work? Fri, 14 Nov 2008 14:52:01 GMT https://community.hpe.com/t5/operating-system-hp-ux/lan-cabling/m-p/4306445#M338700 ami6788 2008-11-14T14:52:01Z https://community.hpe.com/t5/operating-system-hp-ux/lan-cabling/m-p/4306446#M338701 You mean can you use a cat6 GbE cable in a 100BT port? Yes you can, but of course you'll only get 100BaseT speed. The physical media is backwards compatible.<BR /><BR />If its terminating into a GbE port on a switch you might need to hard set the speed to 100FD on both the host and the switch.<BR /><BR />HTH<BR /><BR />Duncan Fri, 14 Nov 2008 15:04:27 GMT https://community.hpe.com/t5/operating-system-hp-ux/lan-cabling/m-p/4306446#M338701 Duncan Edmonstone 2008-11-14T15:04:27Z https://community.hpe.com/t5/operating-system-hp-ux/lan-cabling/m-p/4306447#M338702 But don't hard-code settings until you are _certain_ that the autoneg stuff is broken... Sat, 15 Nov 2008 00:15:53 GMT https://community.hpe.com/t5/operating-system-hp-ux/lan-cabling/m-p/4306447#M338702 rick jones 2008-11-15T00:15:53Z