Let's say I have two serial signals that need to be sent down a cable. This cable features a twisted pair along with a single common wire. If I were to place each serial signal onto one of the twisted pair conductors, how bad would this be?
I realize I wouldn't gain the benefit of common noise rejection had I used the twisted pair to send a differential signal, but would I ruin the quality of each signal by using a twisted pair?
Question: Would each signal in the twisted pair induce voltages into the opposite conductor thus reducing the signal quality? Or would I be better off to have these signals NOT be in a twisted pair? I'm essentially trying to determine whether or not I can be economical with my conductors, or if I should separate them.