sequential (31) network provider vs power supplier

 https://wodewangzhishime.blogspot.com/2022/07/cai-yourong-spy.html

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Ref: https://wodewangzhishime.blogspot.com/2022/06/httpswodewangzhishime_11.html

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John: OK. . Now, I create a parallel input of 0101. .

Me: 0101 is a direct current (dc). . . 

John : Correct. This direct current must be from the power supplier. . This direct current can't be from the network provider.

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Me: ok.  I assume that there is serial input . This input is a direct current too.  This direct current is from network providers .

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John: Correct.