This video is a sample of our eLearning Course on Transmission media and technology. In particular, optical fiber and microwave communications are explored in detail. The module explains digital hierarchies in transmission networks – SDH, PDH in some detail. Participants learn to appreciate the working and advantages of SDH including frame structure, regenerators and multiplexers. Finally, ATM, a popular transmission technology is described highlighting how it brings the best of circuit and packet switched worlds together. For more details contact www.NanoCellNetworks.com