What is RJ45 interface?
The RJ45 interface is usually used for data transmission, and the most common application is the network card interface. The RJ-45 port is one of our most common ports and is the more common twisted pair Ethernet port, because twisted pair is also mainly used as the transmission medium in Fast Ethernet.
RJ45 network cable plug, also known as crystal header, is made of eight cores, which is widely used in the connection of network equipment between LAN and ADSL broadband Internet users (called Category 5 cable or twisted pair).
RJ45 connector is mainly divided into two kinds according to the different sorting of lines, one is orange-white, orange, green-white, blue-white, blue-white, green, brown-white, brown-white, and the other is green-white, green, orange-white, blue-white, orange-brown-white, brown-white, brown-white, so there are two kinds of lines using RJ45 connectors, namely: straight line, cross line. They are called T568A and T568B sequences, respectively.
T568A line sequence
The T568A line sequence is suitable for cross-interconnection occasions, the so-called crossover means that one end of the network cable is in accordance with the T568A line sequence, and the other end is in accordance with the T568B line sequence, and the use scenarios are:
Computers ------- computers
Hubs -------- hubs
Switches -------- switches
Routers -------- routers
The correspondence between each pin of the RJ45 network cable plug and the color mark of the network cable is: plug pin number, network cable color 1, green and white, 3 orange and white, 4 blue, 5 blue and white, 6 orange, 7 brown, white and 8 brown.
T568B line sequence
T568B line sequence application scope
Direct connection: Both ends of the network cable are in the T568B line sequence.
Computer ------- ADSL cat
A computer------- a hub, or a switch
Cross-connect: One end of the network cable is in accordance with the T568B line sequence, and the other end is in accordance with the T568A line sequence.
Hubs ------- hubs
Switches ------- switches
The correspondence between each pin of the RJ45 network cable plug and the color symbol of the network cable is: plug pin number, network cable color 1 orange white 2 orange 3 green white 4 blue 5 blue and white 6 green 7 brown white 8 brown.
RJ45 interface type
The RJ45 interface is commonly used in Ethernet interfaces, supporting 10M and 100M adaptive network switching speeds. There are two types of common RJ45 interfaces: DTE for Ethernet network cards and routers, and DCE for switches. When two devices are connected using RJ45 communication, a crossover wire connection must be used.
Pin Information Sheet
100Base-T defines a family of physical layers (or PHYs) that support 100Mbps networks over twisted pair cables. It is an improved version of 10Base-T Ethernet, offering speeds up to 10 times faster than traditional Ethernet. 100Base-T4 is one of the earliest Fast Ethernet variants and is rarely deployed on the market.
Precautions for use
When using the RJ45 socket connector, it should be noted that when accessing the RJ45, do not use too much force, otherwise it may cause the spring blade in the RJ45 socket to be damaged, resulting in unstable access.
RJ45 plug connector has more pins, which are connected according to the pin order and contact points during the installation process, otherwise some poor contacts will occur, and even the equipment will not work.
The inside of the RJ45 socket connector interface is metal, pay attention not to get wet or contact with water, otherwise it will cause a short circuit.
YBAITE comes with RJ45 interface equipment recommendation:
"Two-way transparent transmission 16-channel serial server, serial port to Ethernet port + optoelectronic isolation + multi-communication mechanism"
"The second-generation serial server module is renewed!Strong performance can be polled, and it is fully compatible with the first-generation pins"
Connecting the Smart Future: The Critical Role of Ethernet IO Modules