Let’s see how we can bring this port back to the router.
Disclaimer: I still don’t have the new router in my lab. But I’m 100% sure that the proposed solutions should work.
Ethernet PHY 88E1512 is connected directly to the proprietary SPX connector inside the router.
The single connector is used for the AUX Ethernet data and Dishy Ethernet (WAN) + Dishy PoE. There is no AUX Ethernet magnetics on the board. Everything is in the external adapter.
It’s great that there are test points around the connector. We can easily trace and map these points. Let’s use the connector pinout from the adapter article. Pins are mirrored on the board side.
Now it’s possible to add the AUX Ethernet port circuit.
First approach: Ethernet magnetics + connector
I designed a simple 1G Ethernet module (EtherMod) that can be connected to the test points described above.
The module is built around H6096NLT 10/100/1000 Base-T transformer. Also, I added TVS diodes for the PHY IC protection.
The board is compact and could be placed somewhere inside the router. I hope 🙂
Connection is easy:
Second approach: Modular Ethernet connector with built-in transformer
It’s possible to replace the Ethernet transformer and connector pair with a single combined connector (built-in transformer). Like this one.
Such a connector might be more expensive, but it eliminates most of the capacitors and resistors. This makes the board simpler and more compact.
Unfortunately, I couldn’t find any suitable connector without built-in LEDs.
The connection method is the same:
Thanks for reading.