This is a fiber optic connector developed by NTT Corporation of Japan. Its shell is rectangular, and the structure dimensions of the pins and coupling sleeves used are exactly the same as those of the FC type. Among them, the end faces of the pins are mostly PC or APC-type grinding; the fastening method is the plug-in pin-bolt type, which does not need to be rotated. This type of connector is cheap, easy to plug and unplug, has small fluctuations in insertion loss, high compressive strength, and high installation density.
ST and SC interfaces are two types of fiber optic connectors. For 10Base-F connection, the connector is usually ST type, and for 100Base-FX, the connector is mostly SC type. The core of the ST connector is exposed, and the core of the SC connector is inside the connector.
