Gigabit Multi-Mode LC Fiber to Ethernet Media Converter with A SFP SX Module, 1.25G Fiber to Copper RJ45 Media Converter, 1000Base-SX to 10/100/1000Base-TX, MMF, Transmission up to 550 meters/1804 ft

Power cord was broken and only worked if I held pressure on it. Customer support offered to inspect it if I paid return shipping. I ended up replacing the end of the cord and it works great. Make sure you check everything within the return window

Lo compré para poner una instalación de fibra óptica om3 junto con cableado categoría 7, antes tenía problemas de estabilidad del Internet y por eso puse fibra óptica en vez del antiguo cable categoría 6 y la velocidad de Internet ahora está al máximo y lo uso más para un sistema mesh de tp link el cual 2 de los routers recibían la mitad de la velocidad de Internet por cable que el principal y con la instalación se solucionó el problema.

I hooked them up and once they linked up instant connection

Theae work very well. Nice and robust metal construction.

As it looks like the reviews Amazon associates with this device are with similar devices, thought I should chime in on how this particular device works. I plugged in a Cisco rated 10GTek multimode, 550m range SFP transceiver into this, plugged the other identical SFP transceiver into my genuine Cisco SG300 series switch and strung up a 30m pre-made multi-mode fiber rated for outdoor use. The goal of this setup over copper is electrical isolation in case of lightning. It just works. At this it is by far the cheapest solution I have hit so far that just works. I tested performance between my laptop and main computer with iperf and performance was identical between directly plugging in laptop to my Cisco SG300 and through this media converter, near 1Gb/s speeds. With it being so quick, cheap, and easy to do fiber this way, one has to wonder why the fastest ISP I can get in the middle of a major, dense city only provides much crappier, unreliable, fails as soon as the power goes out, and slower service with much more expensive hardware so they can do it over coax and my only other option is antique, slow phone lines. Plus when I moved in they had to string up new lines and of course they chose copper, not fiber, which makes no sense to me. With a cheap single mode SFP transceiver and a cheap media converter they could provide me much faster service with lines running back to their central office where they could have UPSes and backup generators to make the service reliable and sell the service for more money because it would be worth it. At this the stuff wouldnt be going out / getting fried every time there was a lightning storm, which has become increasingly common and intense in recent years where I live. Also FiOS makes no sense to me either when I was in a FiOS neighborhood because they installed this gigantic box (ONT) in my closet that must of cost them a fortune while this cheap little box I am using does the same job except much faster at maybe 1/40th the price. So its like I could provide awesome service that serves the customers every need and do it well with a $25 box or I could do it badly with a $1,000 box. Of course telco logic is do it badly with the super expensive box that falls way short of the mark every time.

Set up a pair of these between my router and MacBook Pro improved the streaming sound quality significantly to my very nice 2 channel audio system.

solved a problem allowing me to convert the ethernet to fiber, go down 3 stories on the outside of a building, and using a 2nd, convert back to ethernet

Excellent

Wont connect at 300 feet

Works, it is the solution I needed