James Aweya, PhD, was recently a Chief Research Scientist at the Etisalat British Telecom Innovation Center, Khalifa University, Abu Dhabi, UAE. Before then, he was a technical lead and senior systems architect with Nortel, Ottawa, Canada, from 1996 to 2009. He was awarded the 2007 Nortel Technology Award of Excellence for his pioneering and innovative research on Timing and Synchronization across Packet and TDM Networks. He has been granted 70 US patents and has published over 54 journal papers, 40 conference papers, and 43 technical reports. He has extensive experience and expertise that cover many aspects of telecoms systems design and networking. He is the sole author of eight recent engineering books, including this book, on telecom systems and networks.