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Introduction to Optical Transmission in a Communications NetworkDefinitionIn a telecommunications network, one begins at the terminal site at the customerpremises; the access part of the process is the first mile. In essence, it is the partthat connects the end user to the first piece of equipment in the network. Nextcomes the equipment that performs the connection of data or voice from one sideto another, and then, finally, transmission may occur. Transmission is really thepart of the process people take for granted when they casually draw a line toconnect all of the pieces of equipment in the network.OverviewThis tutorial introduces key topics and new terminology with regard totransmission, focusing on the basic concepts necessary to study synchronous andoptical transmission further. It will provide a more complete view of atelecommunications network, illustrating the access, switching, packetmultiservice, synchronous digital hierarchy (SDH)/synchronous optic al network(SONET), and optical layers. It will clarify the function performed by theSDH/SONET layer and what happens further down in the optical layer.Topics1. History of Transmission2. Why Optical Transmission?3. Transmission Signal Parameters4. Types of Transmission Networks5. Overview of Multiplexing6. WDM and TDM7. Types of Network ElementsSelf- TestCorrect AnswersGlossary