UPC and APC refer to two types of fiber optic connector polish styles: Ultra Physical Contact (UPC) and Angled Physical Contact (APC).

UPC connectors have a flat, slightly domed end-face that provides low insertion loss and are commonly used in digital systems like Ethernet and CATV.

APC connectors feature an 8-degree angled end-face that minimizes back reflection (return loss), making them ideal for analog systems, RF video, and high-precision optical applications.

APC connectors are typically green, while UPC connectors are blue, and they are not interchangeable due to their physical and optical differences.

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