Fiber optic cable is used in applications that require complete immunity to electrical interference. Fiber is ideal for high data-rate systems such as Gigabit Ethernet, FDDI, multimedia, ATM, or any other network topology or application that requires the transfer of large, time-consuming data files. A common application for fiber optic cable is interconnecting a network backbone, where huge amounts of data are transmitted. Although expensive, fiber eliminates problems associated with twisted-pair cable, such as near-end crosstalk (NEXT), electromagnetic interference (EMI), and security breaches.