RJ45 is used with ethernet cables in computer networking while RJ11 is used in connecting telephone units.RJ45 contains more wires than RJ11and RJ45 is physically bigger than RJ11 to accommodate the extra wires
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An RJ11 connector is used for telephones, and an RJ45 connector is used for computer networks, and VoIP telephones. An RJ11 connector only has 2 pins, and an RJ45 connector has 8 pins.