RJ-11 non-international standard: 4-pin telephone line connection plug: It has six wires, but usually only four are used. The RJ-11 interface is the jack into which the ordinary flat wiring of the fixed telephone in your home or office is inserted. In addition, the computer that dials the Internet using a telephone line is to insert the telephone line into the RJ-11 jack of the modem.
RJ-45 international standard: 8-core Ethernet cable connection plug, it is the plug at both ends of your network twisted pair.
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