Established in 1989 and located in USA, state of Arizona, city of Phoenix, National Data Mux distributes and retails data communications equipment in continental America and exports all over the world. We specialize in WAN products namely E1 and E3 multiplexers, T1 multiplexers, DACS, ADSL modems, HDSL modems, G.SHDSL modems, and ISDN modems. We handle routers and ethernet switches as well. Our many years in this business have given us extensive experience in the product categories mentioned and we put that experience to work everyday as we diligently serve our customers by giving them the best product and service possible. When you contact us, be assured that you phone call will be answered. If you leave us a message or send an email, they will be promptly replied. Please pick the phone and give us a call or jot down that email and hit the SEND key !!!