Perhaps it's accurate to say that the distance over which you will get gigabit performance is less with CAT5 than with other cabling. The idea of "not be an issue or not possible" is often assigned to such things as running satellite signal over RG59, or speaker signals over phone wire. It's possible, but performance is less than when using the exactly proper stuff.
A good answer is easier with a clear question giving the make and model of everything. "The biggest problem in communication is the illusion that it has taken place." -- G. “Bernie” Shaw
