Fusion splicing is the preferred choice when optical performance, durability, and long-term reliability are critical. A fiber fast connector, also known as a mechanical splice or cold connector, is a field-installable connector that terminates fiber optic cables without requiring a fusion splicer. It uses pre-installed index-matching gel or mechanical clamping to align the bare fiber with a short fiber stub inside. LC, SC, FC, ST, MPO/MTP compared: ferrule sizes, polishing types, insertion loss, and a decision flowchart to choose the right fiber connector for your application. This allows both fibre ends to become soft enough to merge into a single fibre-optic path. Used with Leviton cabling and connectivity, FASTSPLICE fiber connectors create a complete fiber channel solution and.