Do you need APC?

 Do you need APC?

APC is designed specifically to maximize return loss.  APC ends are actually polished to have an ~8° angle on the end of the fiber.  An APC end will almost always have a green connector to make it clear that the fiber is APC. 



The part that is actually polished to an angle is so small that you won't be able to tell it is angled from looking at it. fiber optic salary

If you mix APC and UPC, the result can be tremendous insertion loss (meaning a lot of light will be lost at the point where you connect the APC to the UPC).  So, if you have a port on your device that specifies it needs APC, you will need to use a cable with an APC end on it.


 If you have a cable with a green connector and you want to attach an adapter cable to the end, you will need to make sure an APC end connects to it.