This guide covers what you need to know about IPC-A-640: the class system, key acceptance criteria, inspection requirements, and how it relates to other IPC standards. Corning recommends that all fiber optic systems be tested to a minimum set. d suppliers of electrical construction services. What is IPC-A-640? IPC-A-640, officially titled “Acceptance Requirements for Optical Fiber, Optical Cable, and Hybrid Wiring. They use specific procedures, such as the TIA-455 series, to make sure products work together and meet quality requirements. FOA standards take a different approach. The Fiber Optic Association (FOA) designs its standards for technicians and installers. Scope: This Standard specifies performance, transmission, and test and measurement requirements for premises optical fiber cable.