What are the functions of the 8 wires in an RJ45 connector?
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It’s just for transmitting signals. 
In the EIA/TIA cabling standards, two wiring schemes for twisted pair cables, 568A and 568B, are specified.
568A standard: white-green—1, green—2, white-orange—3, blue—4, white-blue—5, orange—6, white-brown—7, brown—8.
568B standard: white-orange—1, orange—2, white-green—3, blue—4, white-blue—5, green—6, white-brown—7, brown—8.
(Note: Here, 1, 2, 3, 4, 5, 6, 7, and 8 refer to the PINs on the RJ45 connector).
In a 100 Mbps network, four wires with PINs 1, 2, 3, and 6 are used for signal transmission, while the other four wires with PINs 4, 5, 7, and 8 are reserved for bidirectional use.
However, if the network operates at a bandwidth exceeding 100 Mbps, all eight wires in the twisted pair cable are utilized for transmitting information.
When using Power over Ethernet (POE), the connection of the eight wire cores in the network cable follows the national standard (T568A/T568B). The wire core allocation differs in a network using POE for power supply. POE systems require four cores for transmitting/receiving signals and four core wires for power supply. The four cores used for data transmission are 1, 2, 3, and 6, while the other four core wires are used for power supply: 4 and 5 for the positive pole and 7 and 8 for the negative pole.
The 8 wires in an RJ45 connector serve to transmit and receive data in a network cable. They are typically color-coded and organized into pairs for this purpose, ensuring proper communication between devices. Hope this helps. 