FC Connectors, also known as Ferrule Core Connectors, are often referred to by various names like "Fiber Channel" or "Frank Charlie" in the industry. The FC connector is a fiber-optic connector with a threaded body, which was designed for use in high-vibration environments. Developed by NTT (Nippon Telegraph and Telephone) in the late 1970s as the "Field-Assembly Connector," FC Connectors were the first to feature a. The fiber connector is called a fiber optic or optical fiber connector. It is a precise coupling device that joins fiber optic cables quickly, enabling faster connection and disconnection than splicing. Each type varies by shape, polish (APC, PC, or UPC), and return loss performance, which affect PC, UPC, and APC Polish Styles: What's the.