My network upgrade and you need these transceivers to make an RJ45 connection from a system with a 10G RJ45 jack or to be flexible a long RJ45 socket (category 7 cable or 8) to another device with SFP+ and use the transceiver there. It worked great and was so cheap compared to other SFP+/RJ45 transceivers that I ordered 5 more.
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