sequential (87) RJ45 (Protocol) (direction of current flow )

https://wodewangzhishime.blogspot.com/2023/07/me-look-at-this-article.html?m=1

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Ref: https://kamchihau.blogspot.com/2022/08/httpskamchihau_4.html?m=1

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John : Take a look.https://chihaukam.blogspot.com/2023/10/me-indeed-is-there-any-indias-spy-in.html?m=1 . It mention about a double in/out operational amplifier. 

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Me: Ok.

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John : See the 2nd  Picture above.  We use Rd+ and TX+ to create a Clk line. 

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Me: This clock line is an Alternate current. 

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John : Yes, now, b1 receive a signal from the output (+) of the operational amplifier. 

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Me: How many voltage is this signal ?

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John : 4.5 V.

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Me: Ok.

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John : In fact, at that moment,  the clock line is at Up cycle. 

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