A professional loopback test plug. : r/techsupportgore
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Loopback Set (LPT, COM, Audio, RJ45) - PC-Doctor, Inc.
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6-PACK 10/100 Ethernet Loopback Plug, Pinout 1-to-3, 2-to-6, Gray TS-UL01-6 30955271019 | eBay
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How to: Using an RJ45 Loopback Adapter - YouTube
Loopback Adapter Tester Plug RJ45 Network GigaBit 100MB Ethernet
