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Networking Fundamentals · Intermediate

Ultra Physical Contact (UPC)

A fiber connector end-face polish with a slightly domed flat surface that achieves low insertion loss and good return loss.

Definition

UPC connectors are typically blue and are standard for Ethernet and data center links. Back reflection (return loss) is around -50 dB or better. UPC and APC connectors must not be mated together.

Example

Duplex LC/UPC patch cords connect switches in a data center.

Exam tip

Blue = UPC; green = APC; never mix them.

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