Optical Network Unit Optical Network Unit is the IEEE term for what is called an Optical Network Terminal in ITU-T terminology Related CoursesRelated CoursesRelated Courses SP3801Installing Premises Cabling Systems NETCONNECT ACT IMore Info SP3802Certifying and Troubleshooting Premises Cabling Systems NETCONNECT ACT IIMore Info SP1000Infrastructure Solutions for Broadband ApplicationsMore Info SP3801RInstallation Recertification Training NETCONNECT ACT IMore Info