David Bailey has worked as a telecommunications design engineer in Europe, Australia, Africa and Hong Kong for the past fifteen years. He built up an excellent reputation whilst working for IDC Technologies as a superb instructor in the area of radio engineering. He currently consults to a number of blue chip clients in the telecommunications industry. A professional engineer working for IDC Technologies with over thirty-five years' experience focussing mainly on the telecommunications and data communications industries who has consulted in these areas and presented training courses to over 15,000 engineers and technicians throughout the world.Edwin has over 20 years of practical experience in the planning, design, construction and operation of telecommunications systems, data networks and SCADA systems. He has also been involved as Project Manager on many SCADA and telecommunications projects and has a passion for the topic. He is the co-author of three best selling books on Ethernet, OPC, and Computer Networks. The Internet and TCP/IP and the Principles of Data Communications and has also published numerous papers. He has also consulted widely on SCADA, OPC, data communications and telecommunications issues in the USA, Canada, UK, Australia and New Zealand. Over the past five years more than 8000 engineers and technicians have attended his workshops worldwide. When not working in the communications world he relaxes by reading and writing on technology issues at his beachside home.