Rj45 crystal head routinely needs to be plugged in a few wires.

　　The number of cables that RJ45 crystal heads typically need to be plugged in depends on the network type and the required tranSMission speed. The following is the specific analysis:

　　Fast Network

　　In a 100M network, the RJ45 crystal head actually only needs to use 4 of the cores to transmit data, and these 4 cores are responsible for sending and receiving data. The other 4 cores are used as backup and are not necessary. According to the usual line sequence (e.g. T568B standard), the 4 cores used to transmit data are:

　　Root 1 (white orange): Positive (+) for sending data

　　2nd (orange): Negative (-) to send data

　　Root 3 (white-green): Positive (+) for receiving data

　　Root 6 (green): Negative for receiving data (-)

　　Gigabit network

　　In a gigabit network, in order to maintain high-speed and stable data transmission, all 8 cores of the RJ45 crystal head need to be used. This means that all 8 cores must be connected in strict accordance with standards such as T568A or T568B. The loss or poor connection of any one core may affect the transmission speed and stability of the gigabit network.

　　T568A standard: line sequence from left to right is white green, green, white orange, blue, white blue, orange, white brown, brown.

　　T568B standard: line sequence from left to right is white orange, orange, white green, blue, white blue, green, white brown, brown.

　　summarize

　　In a 100M network, the RJ45 crystal head typically needs to be plugged into four cores to transmit data, with the other four as spare parts.

　　In a gigabit network, the RJ45 crystal head needs to be plugged with eight wires to ensure high-speed and stable data transmission.

　　Therefore, when wiring, the appropriate wire sequence and number of wires should be selected according to the specific network type and requirements.