Fiber-Optic Telecommunications NI ELVIS Communications Device—The ETT-211 FOTEX Board for NI ELVIS II is an add-on application board for the NI Engineering Laboratory Virtual Instrumentation Suite II (NI ELVIS II) or NI ELVIS II+. Developed for education, this device can help you teach introductory fiber-optic telecommunications topics in electrical and computer engineering curricula. Using the ETT-211 FOTEX Board for NI ELVIS II, you can offer students the opportunity to build and measure communications systems that correspond to communications system block diagrams commonly found in textbooks.