They are the same thing. The X refers to "pair", the T refers to "twisted". It is assumed you are talking about pair when you use just the T.
Hope that helps! Michael Barnhart Message Posted at: http://www.groupstudy.com/form/read.php?f=7&i=74599&t=74585 -------------------------------------------------- **Please support GroupStudy by purchasing from the GroupStudy Store: http://shop.groupstudy.com FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html