Information at the speed of light…the potential and promise of fiber optics. As mankind’s insatiable thirst for better, faster information grows unabated, the transmission infrastructure it required becomes more and more complex, and more critical. SONET (Synchronous Optical Network) is an attempt to harness some of the potential of fiber optics, by setting a standard which will open up networks to numerous possibilities thought impossible not so long video conferencing, High Definition Television, and local area network (LAN) transport, to name a few. This book is intended to serve a brief introduction to SONET, allowing the reader to gain an overall appreciation and understanding of its structure and impact. It covers the reasons why SONET exists and is necessary, as well as how it improves network performance. And is all presented in a straightforward, logical, and easy-to-understand manner, understandable to both the technical and the non-technical reader.