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The corresponding line sequence from pin 1 to pin 8 is:

T568A: white-green, green, white-orange, blue, white-blue, orange, white-brown, brown.

T568B: white-orange, orange, white-green, blue, white-blue, green, white-brown, brown.

There is no substantial difference between the two world standards, only the difference in color. It is necessary to pay attention to the need to ensure when connecting two RJ crystal heads: pin 1 and pin 2 are a winding pair, pin 3 and 6 are a winding pair Yes, pin 4 and 5 are a winding pair, and pin 7 and 8 are a winding pair. In the same general wiring system project, only one connection standard can be selected. TIA/EIA-568-B standards are generally used in the production of connecting wires, sockets, and distribution frames. Otherwise, they should be clearly marked.

The RJ module is an important socket in the connector

The common RJ module is a kind of connector in the wiring system, and the connector is composed of a plug and a socket. The connector composed of these two elements is connected between the wires to realize the electrical continuity of the wires. The RJ module is an important socket in the connector.

ZE20614ND Unshielded Yellow Modular Jack 1X4 Port RJ45 Connector With LED

What is the role of network transformer? Can you not pick it up?
Theoretically speaking, it can work normally without connecting the network transformer and directly connecting to the RJ. However, the transmission distance will be limited, and it will also be affected when it is connected to a network port of a different level. And the external interference to the chip is also great. When the network transformer is connected, it is mainly used for signal level coupling. 1. Strengthen the signal to make the transmission distance farther; 2. Isolate the chip end from the outside, enhance the anti-interference ability, and increase the protection of the chip (such as lightning strike); 3. When connected to different levels (such as Some PHY chips are 2.5V, and some PHY chips are 3.3V), it will not affect each other’s devices.
In general, the network transformer mainly has the functions of signal transmission, impedance matching, waveform repair, signal clutter suppression and high voltage isolation.