problem with samsung tv or cable i dont know

vbmohsen2

Honorable
May 16, 2013
2
0
10,510
hi.
i have 3 cat 5e straight cable. all of them work fine for connect router to a pc .but one of them is 12 meters long even not detect by tv.even in router the led of that port not light when its connect to tv.two other cables are working fine for connect tv to router.where is the problem?
that two cable working fine have 2-3 meters long
sorry for my english