RJ45 and RJ11 are two different types of interfaces, mainly used for network and telephone communication. They have differences and similarities in the following aspects:

RJ11

Different purposes: RJ45 interface is usually used for Ethernet network connection, supporting data, and network signal transmission. RJ11 interface is usually used for telephone line connection, supporting voice signal transmission. Different interface sizes: The RJ45 interface is larger than the RJ11 interface, usually with 8 metal contacts, while the RJ11 interface usually only has 6 metal contacts. Different wire sequence standards: RJ45 interface has two different wire sequence standards: T-568A and T-568B, used to make crossover or straight-through cables. RJ11 interface has a fixed wire sequence, usually only using the middle four pins. The similarities between the RJ45 interface and the RJ11 interface are:

RJ45

They both adopt the universal modular connector design, which realizes the connection between devices by plugging and unplugging. They both can use twisted pair cables for data transmission, but the RJ45 interface can use higher category cables, such as Cat 5e or Cat 6, to improve the transmission rate and anti-interference ability. RJ45 interface and RJ11 interface are used for the following scenarios respectively:

RJ45 interface is used to connect various network devices, such as computers, routers, switches, printers, network cameras, etc., to realize LAN or WAN communication. RJ11 interface is used to connect telephone sets, modems, fax machines, ADSL broadband Internet users' network devices, etc., to realize voice calls or low-speed data transmission.

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