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https://chihaukam.blogspot.com/2026/01/john-fire-of-hk-claim-170-peoples-lives.html?m=1 . Ref:  https://chihaukam.blogspot.com/2023/10/me-indeed-is-there-any-indias-spy-in.html?m=1 . . John : Take a look.   https://wodewangzhishime.blogspot.com/2022/03/httpswodewangzhishime_7.html?m=1  . It mention about how TX(-) of RJ45 transmit a signal.  Me: However,  the wave of this signal is a square wave. . John : Yes, however,  take a look at the picture above.  Do you see a resistor, capacitor and inductor? . Me : Yes, . John : They play the role of RC network and LC network.  Note: LC mean Inductor and resistor while RC mean Resistor and Capacitor. . Me: Those network will automatically change the Square wave into a Sine Wave. . John: Yes,.