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https://wodewangzhishime.blogspot.com/2023/11/ref-httpswodewangzhishime.html?m=1 . Ref:  https://chihaukam.blogspot.com/2024/05/kelvin-you-announce-in-media-that-all.html?m=1  . . . Me: See the Picture above.  It's a RJ45 circuit. Because there's current flow in the Server's side, there's current flow in the Client's side. . John : It's wrong.  There's power source in the client side. It's 2 V.  Even if there's no current flow in the Server side,  there's current flow in the Client Side. . Me: I assume that.  There's a "packaged wave". Inside it, there's a single carrier wave. . John: Ok. . Me: They are from the Server side. . John : Ok. . Me : The "packaged wave" and the "carrier wave" will enter the physical layer. . John: Ok. . Me: The packaged wave will become the clock line of the physical layer while the carrier wave will become the "data input" in the physical layer.  . John: Yes,. .

https://wodewangzhishime.blogspot.com/2023/07/me-look-at-this-article.html?m=1 . Ref:  https://kamchihau.blogspot.com/2022/08/httpskamchihau_4.html?m=1 . . . . . . . . John: See the 1st picture. Ther're 2 way of connection of RJ45. Both ways are OK. Let me explain the 2nd picture.  When Port A is being input, Port B is with the status of outputing. Me: OK. . John: See the 3rd picture. When Port B is being input, Port A is with the status of outputing. . John: I explain the 4th picture. When Port D is outputing, Port C is with the status of being input. Me:OK. John: See the 5th picture. When Port C is outputing, Port D is with the status of being input.