What is a fiber optic fusion splice box also called

A fiber optic fusion splice box is commonly called a splice box, splice closure, or fiber joint box.

A splice box (also known as a splice distributor) is a housing where fiber optic cables begin or end, and where fibers are fused together using a fusion splicer. It contains components such as a splice cassette, which holds the fibers and their reserves, and a front panel with connectors for transmitting signals via fiber or copper cables . The cassette is removable to facilitate splicing and assembly with a fusion splicing unit . Alternative names include:

• Fiber Joint Box: A sealed outdoor or underground enclosure designed to protect fiber splices from environmental hazards while providing mechanical strength and cable management .
• Splice Closure: Another term for a protective enclosure for fiber splices, often used in outside plant (OSP) networks .
• Cable Joint Enclosure: A broader term emphasizing the protection and organization of spliced cables . Key functions of a fiber optic fusion splice box:
• Protects the spliced fibers from environmental damage and mechanical stress.
• Organizes and manages fiber routing and reserves.
• Provides a secure interface for connecting fibers to patch panels or other network equipment.
• Supports both indoor and outdoor installations, including wall-mounted, pole-mounted, or buried applications . In practice, fusion splicing is performed inside these boxes to create permanent, low-loss, and highly reliable joints between fibers . The choice of enclosure depends on the installation environment, whether indoor, outdoor, or underground, and the required protection level.