A method of forming an LDD of a semiconductor device. The optical switch includes not only signal transmission characteristics, but also signal reflection capability. The IP network is notified about link resource information of the ATM network in such a way that an alternative route to the virtual circuit in the ATM network is searched for and then the IP network is notified about a link resource of the alternative route found in the ATM network to ensure the required QoS. The main body portion has a substantially concave component housing region proximate the base of the signal contact that receives a main body of the axial lead component.