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I had to test this for a while before reviewing. I have purchased other SFP modules that only would switch and only run at half duplex after a power failure or disconnect/reconnect of a device. The only way to get them back to full speed was to manually set them again. This module did not have any issues, was immediately recognized and usable. Great price and does exactly what I expected.
I bought this specifically to plug my laptop (RJ45 port) into the Dell S6010 and S4148-ON switches. Worked great!! I'm sure it will be fine in other *modern* Dell switches. Not sure about Dell switches from 5 to 8 years ago, as things in switch hardware have changed quite a bit over the last several years.
Bought this for a Dell server and it worked as intended, plus fast shipping. It is also listed as 1.25g but I have not had a chance to see if I can get that link speed somehow. I just needed a basic gigabit rj45 SFP fast with prime shipping that was without question going to work in my server.