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Hard-wired Ethernet Connection

The Wi-Box's board has an unpopulated header labelled TXP, TXN, RXP, RXN. It exposes an un-isolated 100FDX Ethernet interface.

Ethernet Transformer

Since it appears to go directly to the SOC without protection, an ethernet transformer is absolutely required to avoid frying the device when connecting it to your network (think about EMI, lightning, etc.).

To get an ethernet transformer in a user-friendly package, you can use a IEEE802.3AT PoE splitter. These isolate the ethernet input with a transformer and:

  • use primary center-taps to extract the common-mode PoE voltage, then feeding the extracted voltage to a DC-DC converter towards the USB connector
  • connecting the secondary of the transformer with the diferential Ethernet data to the output eth cable.

In this case, the HS1602 is the 100M Eth transformer, but this should be irrelevant.

We don't even need to feed it PoE; the transformer will be in-circuit regardless.

So by stripping the output ethernet cable and connecting it to the board, the eth0 interface will become up:

Wiring

eth | board
  1 - TXP
  2 - TXN
  3 - RXP
  6 - RXN

Note

Keep in mind the header is not the ubiquitous 1.27mm pitch but rather 1mm(?), so that may cause some annoyance if you want to add a header connector (comfortable for re-assembling it into the case).

Image

Default access

The ethernet interface shows up as eth0 in the device, and is configured by default to use a static IP address of 192.168.1.10.

Note

Assign your computer's ethernet NIC connected to the device an IP in the same subnet (e.g. 192.168.1.20) and subnet mask of at least /24 so it can communicate with the device.

You can connect it directly to a NIC on your computer a it to any IP in the same subnet, and access it via telnet (if the device is stock).

Connecting it to an existing network

To connect it to an existing network, you should either set a static IP in your network or enable DHCP:

Changing the IP address to a static IP

For example, to set the IP address to 192.168.20.133

ip addr add 192.168.20.133/24 dev eth0
ip route add default via 192.168.20.1 dev eth0

Enabling DHCP

TODOa