LC stands for Lucent Connector (developed by Lucent Technologies in the 1990s). 25 mm ceramic ferrule — half the diameter of the SC connector's 2. Key features: LC connectors are standardized under IEC 61754-20 and TIA-604-10. LC fiber connectors, as the most well-known representative of SFF (Small Form Factor) connector, are widely adopted in today's LAN and data center cabling. LC connectors are available for both singlemode and multimode applications. LC/APC plug connectors have an obliquely (8°) cut fibre endface that. Of the more than a dozen types of fibre-optic connectors available, the four most commonly used today are LC, SC, FC, and ST. 5 mm ferrules found in SC. An optical fiber connector is a device used to link optical fibers, facilitating the efficient transmission of light signals.