You often read things like FC/PC Simplex Multimode connector, LC/APC Simplex Singlemode connector or SC/UPC Simplex Singlemode connector, but what do all those words mean? Specifically PC, APC and UPC. PC, UPC an APC are acronyms for Physical Contact, Ultra Physical Contact and Angled Physical contact and they refer to the way the connector ferrule, the tiny ceramic structure that holds the fiber, is polished.

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