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who told you that? Twisting the pair tighter results in a lower impedance, but not necessarily a better data rate. The optimum twist rate gives the impedance the gates want to see (for instance 110 ohms is a typical target)
It's wrong.
In the faster cables the cross-coupling between pairs is minimized using different twist rates, allowing higher data rates.
That's also why they are more expensive to manufacture (materials matter too).
By the way: tighter twist -> lower impedance -> higher propagation delay, but this is a second order concern.
You may try to delve into **broken link removed**.
The twist rate (pitch) is used to evaluate a compensated dielectric constant.
Note that, increasing the rate, the velocity of propagation gets slowers.
The point is that propagation has nothing to do with transmission rate!
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