What is the RJ45 interface?Introduction to the basics of the RJ45 interface

What is the RJ45 connector?

RJ45 type network cable plug, also known as crystal head, made of a total of eight cores, is widely used in local area networks and ADSL broadband Internet users of network equipment between the network cable (called Category 5 cable or twisted pair) connection.

RJ45 connector according to the line sort of different main two kinds, one is orange-white, orange, green-white, blue, blue-white, green, brown-white, brown; the other is green-white, green, orange-white, blue, blue-white, orange, brown-white, brown; so the use of RJ45 connector line there are two kinds of that is: straight through the line, the crossover line. They are called T568A wire sequence and T568B wire sequence.

T568A Wire Sequence

T568A wiring sequence is suitable for cross-interconnection occasions, the so-called crossover means that one end of the network cable in accordance with the T568A wiring sequence, one end of the cable in accordance with the T568B wiring sequence, the use of scenarios have:

Computers ------- computers

Hubs -------- hubs

Switches -------- switches

Router -------- router

The correspondence between each pin of the RJ45-type network cable plug and the network cable color marking is as follows: Plug Pin No. Network Cable Color 1 Green White 2 Green 3 Orange White 4 Blue 5 Blue White 6 Orange 7 Brown White 8 Brown.

T568B Wire Sequence

T568B Line Sequence Scope of Application

Direct interconnect: Both ends of the network cable are in T568B wiring order.

Computer -------ADSL cat

Computer ------- hub or switch

Cross interconnect: one end of the network cable follows T568B wiring order and one end follows T568A wiring order.

Hubs ------- hubs

Switches ------- switches

The correspondence between each pin of the RJ45-type network cable plug and the network cable color marking is as follows: Plug Pin No. Network Cable Color 1 Orange White 2 Orange 3 Green White 4 Blue 5 Blue White 6 Green 7 Brown White 8 Brown.

RJ45 Interface Type

The RJ45 interface is commonly used for Ethernet interfaces and supports 10M and 100M adaptive network switching speeds. There are two common types of RJ45 interfaces, the DTE for Ethernet NICs, routers and other interface types, and the DCE type for switches and other types. When two devices are connected using RJ45 communication, they must be connected using a crossover cable.

Pinout Information Sheet

100Base-T defines the 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 was one of the earliest Fast Ethernet variants and is rarely deployed in the marketplace.

Precautions for use

In the use of RJ45 socket connector need to pay attention to, access to RJ45, do not use excessive force, otherwise it may lead to the RJ45 socket within the spring plate damage, so that the phenomenon of access instability.

RJ45 plug connector has more pins, in the installation process in accordance with the pin order as well as the contact point connection, otherwise some poor contact will occur, and may even lead to equipment can not work.

The inside of the RJ45 socket connector interface is metal, so be careful not to let it get wet or come into contact with water, or it will cause a short-circuit phenomenon.