RJ45 Ethernet cable interface is a widely used network interface, full name is Registered Jack 45, meaning "Registered Jack 45", which is an internationally recognized standard for connecting hardware. It is mainly used for data transmission in computer networks and is one of the most common interfaces in local area networks. The following is a detailed explanation of the RJ45 Ethernet interface: 1. Definition and structure
Definition: RJ45 interface is a standardized plug with 8 positions (pins) for inserting Ethernet cables (Category 5 or twisted pair) to connect network devices.
Structure: The RJ45 interface (commonly known as a crystal head) is made of eight cores, each with a specific color code to distinguish different functions and connection methods. 2、 Function and purpose
Main function: RJ45 interface is used to connect network devices such as computers, routers, switches, etc. in the local area network, to achieve data transmission and communication.
Widely used: RJ45 interface is almost ubiquitous in computer networks and is an essential interface for building local area networks and broadband internet access. 3、 Connection method and line sequence
Connection method: There are two common connection methods (line sequence) between RJ45 interface and Ethernet cable, namely T568A and T568B. These two types of line sequences have different color arrangements, but both can achieve normal transmission of network data. At present, T568B line sequence is more commonly used.
Line sequence example: T568A Line sequence: green white, green, orange white, blue, blue white, orange, brown white, brown T568B Line sequence: white orange, orange, white green, blue, white blue, green, white brown, brown
Direct line and cross line: Depending on the connected device, RJ45 interfaces can also be divided into direct line and cross line. Direct lines are used to connect different types of devices (such as computers and routers), while cross lines are used to connect devices of the same type (such as between two computers). However, with the intelligent development of modern network devices, many devices already support automatic flipping function, so the use of cross lines in practical applications has become increasingly rare. 4、 Transmission speed and compatibility
Transmission rate: The RJ45 interface supports multiple network connections, including 10Mbps, 100Mbps, and 1000Mbps (i.e. Gigabit Ethernet). Different transmission rates correspond to different network application requirements.
Compatibility: Due to the RJ45 interface becoming an international standard, it has a wide range of compatibility. Network devices of different brands and models can be interconnected through RJ45 interfaces.
RJ45 Ethernet interface is an indispensable part of computer networks, providing strong support for network data transmission and communication with its standardized design, wide application range, and flexible connection methods.