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That is the connection speed from the device to the router. Not what it's actually transmitting.

Oh thanks you so much. Now it makes more sense.

Do you have any idea why it takes so much data between the echo and the router then? Other devices in home didn't take that much :(.

You still are not understanding, the tx and rx are simply what speed they are connected at, not any different than your ethernet connection reporting 100 mbps or 1000 mbps, it does not mean it is actually transmitting that much data.

Sorry for my ignorance. You seems to know this stuff very well.

So to clarify, it's mean the speed when the device is connected at, but I saw they changing up and down? How does that get calculated if they aren't the actually transmiting data?

Automatic negotiation with your wireless router. The max tx/rx speed will change regularly, especially if you’re in noisy WiFi area.

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