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The difference between RJ45 connector and RJ11 connector

The RJ45 interface is usually used for data transmission, and the most common one is a network card interface. There are two types of cables using RJ45 connectors: straight-through cables and crossover cables. There are two types of common RJ45 interfaces: DTE type used for Ethernet network cards, routers, Ethernet interfaces, etc., and the other type of DCE used for switches, etc.
The RJ11 interface is similar to the RJ45 interface, but only has 4 pins (8 for RJ45). In computer systems, RJ11 is mainly used to connect modem modems. RJ11 usually refers to a 6-position (6-pin) modular jack or plug. This kind of connector has no international standard and is mentioned in the general integrated wiring standard.
 
The difference between RJ45 connector and RJ11 connector
Different standards, different sizes (RJ11 has 6P6C, 6P4C, 4P4C, 4P2C, where C represents the number of gold pins of the crystal head; RJ45 has 8P8C)
 
Due to the different sizes of the two (RJ11 is a 4- or 6-pin connector, RJ45 is an 8-pin connector), the RJ45 connector cannot be inserted into the RJ11 connector. The reverse is physically feasible (the RJ11 connector is smaller than the RJ45 connector hole), which makes people mistakenly believe that the two can work together. This is not the case. It is strongly recommended not to use RJ11 plugs for RJ45 connectors.

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