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What is the difference between UPC and APC connectors, and what do StarTech.com cables use?

UPC and APC are fiber cable connector types. UPC (Ultra Physical Contact) connectors have a fiber connector end face that has been polished to be dome-shaped. This results in light that can be reflected straight back to the source.

APC (Angled Physical Contact) connectors have a fiber connector end face that has been polished at an eight degree angle. This results in a reduced amount of light that is reflected between the two connected fibers.

StarTech.com fiber cables use UPC connectors.