Complete step-by-step guide for installing SC fiber optic fast connectors. It works with a ceramic ferrule which aligns the optical fibers for efficient transmission of light. This component works well with both single-mode and multi-mode fibers, thus reducing signal. Of the more than a dozen types of fibre-optic connectors available, the four most commonly used today are LC, SC, FC, and ST. In addition to serving the same general function, the four connectors differ in size, locking mechanism, and best applications. The connectors with PC finishes are completely intermateable with flat.