eto kakvo namerih po vaprosa

Note that pins 4, 5, 7, and 8 and the blue and brown pairs are not used in either standard. Quite contrary to what you may read elsewhere, these pins and wires are not used or required to implement 100BASE-TX duplexing--they are just plain wasted.

В 99% от случайте проблема е ПРЕДМОНИТОРЕН bst