FC Fiber Optic Patch Cord stands for Fixed Connection. It is fixed by way of a threaded barrel housing. FC connectors were designed for use in high-vibration environments. As networks move to higher speeds and higher density, choosing the right fiber optic patch cords becomes critical to the reliability of your system. It is mainly used in applications such as optical fiber communication systems, optical fiber access networks, optical fiber data transmission networks, and local area networks. Understanding the key differences between these connectors is essential for making informed decisions when it comes to. In the world of copper Ethernet Category cable, very little has changed in regards to how you terminate it in the last 20 years. The FC connector is the most popular.