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https://www.upcomnet.com/products/ethernet-media-converter-100m-18.html

MC101 Ethernet Media Converter, also known as Fiber Optic Media Converter, is a networking device that transparently converts data between short-distance electrical signals and long-distance fiber optic signals, plug-and-play, no configuration required, can be operated at wide temperatures range from 0 to 50°C.

UPCOM MC101 Fiber Media Converter support 1-port 10/100M Base-T(X)+1-port 100M FX, adopts durable metal housing, external DC5V, is a flexible and cost-effective solution that can extend transmission distances to 120km through a single-mode fiber, protecting data from noise and electromagnetic interference.