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Amazon.com: RJ45 to RJ11 Cable, 6 Feet Phone Jack to Ethernet Adapter RJ11 6P4C Male to RJ45 8P8C Male Connector Plug Cord for Landline Telephone : Electronics
Delock Products 90511 Delock Crimp tool with stripper and network tester for 8P (RJ45), 6P (RJ12/11), 6P DEC or 4P (RJ10) plugs
What are RJ11 connectors? Everything you need to know