A small housing with a connector receptacle on each side and an alignment sleeve inside that centers the two ferrules. Singlemode adapters use zirconia split sleeves; the housing color follows the connector: blue UPC, green APC, beige multimode, aqua for laser-optimized multimode. Barrels snap into patch panel plates, and a worn or dirty sleeve adds loss to every connection made through it.
Grab a couple of LC barrels so we can join these two jumpers and get the camera link up until the panel shows up.
A UPC barrel will accept an APC connector without complaint, so the color code is the only thing standing between you and a bad link.
Also heard as
- adapter
- bulkhead
- coupler
- feedthrough
Related terms
Connector
A removable termination that aligns the end of one fiber with another so light passes between them.
Patch panel
A rack-mounted enclosure of adapters where permanent cable fibers end and jumpers connect them to equipment.
Ferrule
The precision ceramic or metal cylinder in a connector that holds the fiber and lines it up with its mate.
APC
Angled Physical Contact: a singlemode connector polish with an 8 degree angle that sends reflections into the cladding.