The primary goal of this research is to keep the good performance of the LANs communications pass through the five categories of unshielded twisted pair. This is a working theory based on the idea that is to illustrate the optimizing character of Hub-spoken topology. The foundation and the features of Hub-spoken topology and the five categories of unshielded twisted pair are explained in detail. The concept of the dependable margin motion coefficient was put forward on the basis of the margin motion coefficient and the reliability coefficient. This research aims at providing the best solutions of Hub-spoken topology to improve performance of the LANs communications.