Something to be wary of when interpreting the datasheet:
- Act10 = LED blinking when Ethernet packets transmitted/received at 10Mbps.
- Act100 = …
- Act1000 = …
Bad wording on their part. What they really mean is: “LED blinking when Ethernet packets transmitted/received AND the link is currently in a XYZMbps link speed mode”. The mode is negotiated once after you plug a cable in and usually does not change after that, regardless of how much data you try to send.
Technically each linkspeed/mode is a whole ethernet standard of its own, but we mostly gloss over that and pretend to end users that they’re backwards compatible.























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