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Are APC or UPC fiber connectors recommended for Modicon switches?

Use only cables with UPC connectors for all Modicon or Connexium fiber switches.

APC – Angled Physical Contact
These connectors feature a fiber end face that is polished at an eight-degree angle
Connectors are green.

UPC – Ultra Physical Contact
These connectors are polished with no angle. UPC connectors are not exactly flat, however, they have a slight curvature for better core alignment.
Connectors are blue.