Why DC Coupling or AC Coupling between TX & RX in Serial Interface?

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Very useful video!
I was always wondering why is this Manchester coding used in AUX port design, which also has AC coupled serial link. Now I see the reason. In Manchester coding, each data bit in encoded in such a way that it is high and low equal time (during one bit interval). Hence, it will avoid DC wandering and obviously will be way better DC balanced vs simple NRZ coding.
One question. At 5:00, you have 50Ohm resistors to set CM levels on RX input. I assume that channel is also 50Ohm, and that is why you choose 50Ohm resistors to avoid reflection ? but why do we need to have 50Ohm resistors also on the TX side ?

hrachya_khachatryan
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Thanks for all these valuable information

balajiyoki
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Thank you for good videos. Can you also post videos on power dc and power ac analysis?

shadyEA
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Hi, CC, I have a question. In practice, ac couple cap might be placed close to RX side or TX side, which is better from circuit perspective? Some interface design guides such as GMSL3 suggest putting accap close to TX within 0.5UI. I could not find a good answer for this suggestion.

mountaineagle