An important part of the telecommunications infrastructure that supports voice and data transmission is fiber-optic cable. With fiber-optic cable, data travels as light wave transmissions, rather than as digital or analog electrical transmissions. What exactly is fiber-optic cable, and how does it work? For a basic overview of fiber optics, visit oak.cats.ohiou.edu/~sl302186/fiber.html. For additional information, visit Lascomm Fiber Optic Data and Video Communications at www.lascomm.com/toc.htm, which has tutorials on fiber-optic cables, articles on a variety of fiber-optic topics, a glossary of industry terms, and case stories of innovative uses of fiber optics. For a discussion of how sound is transmitted over fiber-optic cables, the history of fiber-optics in telecommunications, and a description of how fiber-optic cables work, visit www.att.com/technology/forstudents/brainspin/fiberoptics. To learn about the fiber-optic industry and fiber-optic manufacturers, check out The Fiber Optic Marketplace at fiberoptic.com.