Fiber Optic Cable and Splice Closure Solutions | Corning

It is a fiber enclosure that is either watertight or breathable, aimed at protecting optical fiber splices and connectors coming from different outside plant cables and offers a full protection to the optical fiber. Cables can be feeder, branch, drop, ribbon, loose tube, and microcables.

Splice closures can be used below grade, either direct-buried, in a manhole/handhole, or aerial on a façade, pole, or strand-mounted on a messenger or ADSS cable. 

From a construction standpoint, a fiber optic splice enclosure is composed of the enclosure shell ensuring weather protection, a fiber manager which allows routing and protection to buffer tubes, the bare optical fiber, and relevant splices and cable entries.

A butt closure is an optical splice enclosure which has all the cable ports on the same side.

An in-line closure is a splice enclosure with a cable port on two opposite sides. 

Single Circuit Management (SCM) is a type of optical fiber manager inside an optical fiber enclosure. SCMs are dedicated thin fiber splicing trays protecting a circuit 9a-pair or an element, and designed to offer a high grade of fiber protection and separation.  Fibers are protected outside the tray and fiber routing is very flexible and adapted to specific engineering.

The enclosure is sealed watertight with gaskets.

An express port, also called an oval port or midspan port, allows an optical fiber cable to be sealed and strain-relieved without cutting the fiber and buffer tubes. It is used in applications where only a few fibers from a feeder cable will be spliced in the closure while other fibers and the relevant midspan will pass through the closure.

A breathable closure is a fiber closure used above grade (pole/façade or strand mount). It offers the appropriate weather protection (rain, pressurized water, dust) while providing the possibility to eliminate internal condensation through venting ports. Breathable closures cannot be used below grade.

A single-fusion splice is a fusion splice of two fibers together. The result is an optical continuity between these two fibers. The splice is protected inside a splice protection sleeve.

A mass fusion splice is the splice of more than two optical fiber ribbons of the same size together. Typical mass fusion splices have four, eight, or 12 fibers, with 12 being the most common.