In daily life, the RJ45 standard network cable interface can be seen everywhere, and the router, computer, IPTV TV box, etc. at home all use the RJ45 interface. The electromagnetic compatibility performance of its interface is related to the stable operation of communication equipment. Therefore, the circuit design of RJ45 is very important. When the TX-/TX+ and RX-/RX+ signals from the signal transformer are connected to the RJ45, they must comply with the RJ45 interface specification. Specific requirements are as follows:
1) The polarity must be correct and the connection must not be reversed. Although some chips support polarity reversal, problems sometimes occur when matching chips with different schemes.
2) The transmission and reception must be correct and must not be reversed. Although the current chip design dilutes the position of the transceiver pair, in order not to take risks, unless the wiring cannot be achieved, the wiring must not be reversed in accordance with the regulations.
The detailed polarity and transceiver connection regulations are as follows:
100M card type terminal (corresponding to the WAN port of a general router) RJ45 interface: 1-TX+, 2-TX-; 3-RX+, 6-RX-;
100M switch (corresponding to the LAN port of a general router) RJ45 interface: 1-RX+, 2-RX-; 3-TX+, 6-TX-;
1000M RJ45 interface: 1-DA+, 2-DA-; 3-DB+, 6-DB-; 4-DC+, 5-DC-; 7-DD+, 8-DD-; or: 1-DB+, 2-DB- ; 3-DB+, 6-DB-; 4-DD+, 5-DD-; 7-DC+, 8-DC-;
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