The significance of this 8° angle becomes apparent when addressing return loss issues. The APC ferrule endface radius is polished at an 8° angel while UPC connectors are polished at a 0° angle. The major physical difference between APC and UPC connector is the endface geometry. UPC connectors are easily identified by their blue color on the connector boot. The generally accepted color code for connector bodies and/or boots is beige for multimode fiber, blue for single mode fiber, and green for APC connectors. There are several considerations to make, including the network design or purpose and the types of services that will be transported over the fiber. The choice between angle-polished connectors (APC) and ultra-polished connectors (UPC) can make a significant impact on how a particular network will perform.
The parts are typically identified by adding “/APC” to the name.įor example, an angled FC connector may be designated FC/APC, an angled LC connector may be designated LC/APC, etc.įC/APC Connector SC/APC Connector LC/APC Connector :: Choosing the Right Connector – APC vs.
BACK PANEL CONNECTOR DEFINITION HOW TO
:: How to Tell an APC connector?Īngled-polished connections are distinguished visibly by the use of a green strain relief boot, or a green connector body. “Ultra” quality connectors may achieve comparable back reflection to an angled connector when connected, but an angled connection maintains low back reflection even when the output end of the fiber is disconnected. Generally angle-polished connectors have higher insertion loss than good quality straight physical contact ones. Mating to a non-angle polished connector causes very high insertion loss.
Like illustrated in the following picture.īecause of the angle, the reflected light does not stay in the fiber core but instead leaks out into the cladding.Īngle-polished connectors should only be mated to other angle-polished connectors. APC Connector is a type of fiber connector that minimizes backreflection due to a 5° to 15° angle-polish applied to end faces.
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