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.