Fiber Adapter (also known as the flange), also known as fiber optic connectors,  are the optical fiber connectors' connecting parts. The products include: FC SC ST LC MTRJ. Widely used in optical distribution frame (ODF), Fiber optic communications equipment, Instruments. Superior performance, stable and reliable.

Between the fiber ,adpters connected by the inner slip coupling to ensure maximum connectivity between the fiber jumpers. To fixed in a variety of panel, but also design a variety of fine fixed flange.
Transform adapter type can be connected to different types of fiber optic jumper interface, and provides a connection between the APC face double or more even improve the mounting density.
Fiber adapters classification:

FC / PC FC / UPC FC / APC SC / PC SC / UPC SC / APC ST / PC ST / UPC SC / APC

Fiber Adapter: SC, FC,ST.
SC on behalf of Standard Connector,.
ST on behalf of Straight Tip.
FC on behalf of the Fiber Connector,.
"/" The front part stands for the pigtail connector models.
"SC " is the standard rectangular connector, engineering plastics, high temperature, not easily oxidized advantages. Transmission equipment sidelight interface for general use SC connectors.
"LC" connectors and SC connectors are similar in shape, smaller than the SC connector.
"FC" connector is a metal connector, usually used in the ODF side, pluggable metal joints more often than plastic.
More varieties signal connector, the three described above, MTRJ, ST, MU, a specific look.
"/ "Followed by cross-section technology that fiber optic connectors, namely polishing.
"PC" in the equipment of telecom operators is the most widely used, the joint cross-section is flat.
"UPC" attenuation is smaller than the "PC", generally used for devices with special needs, some foreign manufacturers ODF frame internal jump fiber with the FC / UPC, mainly to improve the indicators of the ODF device itself.