We have build a custom carrier board for the Jetson Nano and see some strange behavior regarding Ethernet link. We connected a 10/100BaseT LAN-Transformer instead of of Gigabit to reduce power consumption. This works generally well. But detecting the Ethernet Link to go down, when removing the Ethernet cable does not work reliable. So the Jetson “thinks” it is still connected to Ethernet if we check it with
In some random cases on some devices the link change is seen, in others we do not see the link go down. We have noticed this behavior when connecting to 100 MBit switches as well as on 1 GBit switches.
We already tried to use the mainline r8169 driver instead of the bundled Realtek driver. For both drivers we see the same behavior. We also did an Ethernet compliance test which succeeded.
The LAN-Transformer is connected to pins 184/186 and 190/192. Link and activity LED’s are connected to 188 and 194.
Do you have any ideas what may cause this issue or give any hints on solving it?