ST, Abbreviation for straight Tip, means bayonet fiber optical connector. Adopted on the ODF as well, it is easier and faster to install this type of fiber connector. The optical fiber connector is a kind of detachable passive optical component used in the connection between fiber to fiber, the light source to the fiber, and fiber to the detector to achieve the light maximize coupling to the receiving fiber. The differences between LC, ST, and SC connectors are crucial for various applications in networking. In this article, we. ST Connectors, also known as "Straight Tip" or BFOC (Bayonet Fiber Optic Connector), were developed by AT&T in the mid-1980s as a cost-effective and space saving alternative to the larger Biconic Connector.