The Fluke Networks DSX-8000-CFP-Q-ADD is the CAT 8 / Class I CableAnalyzer Versiv Modules and CertiFiber Pro OLTS Module. This item should be ordered when you need the Fluke Networks DSX-8000 CableAnalyzer for Copper Certification, a CertiFiber Pro OLTS Module for fiber optic cable testing, do not need an OTDR or Fiber Inspection modules, and you already own the Versiv Mainframe. The Fluke Networks Versiv family of cable testers offer modular solutions for every copper and fiber cable testing application. Check out our DSX-8000 product page to view all of your ordering options.