I've been consdering designing a full-duplex radio link myself, but would mean I would use two wi-fi channels (AP's at each end) and a router at each end. Understandably as Wi-Fi equipment uses the same carier (channel frequency) for receive and transmit, so is only half-duplex as mentioned. I thought of routing traffic in this sense between both segements.


router 1| 10.0.0.1 ---->--ch11---->----- 10.0.0.2 |router 2
router 1| 10.0.0.4 ----<--ch10----<----- 10.0.0.3 |router 2

The router would be effectively a cheap PC (or hardware router), which has a two network cards, and windows setup to forward IP packets (something that can be done via the windows register to make it a router). Traffic on router 1 would send (metric priorty 1) non-local traffic outbound via 10.0.0.1 to router2 awaiting at 10.0.0.2 which it would forward over its network. Then router2's table would send non-local traffic back via 10.0.0.3 to router1 destined for its network etc... Router1 could have a route table entry (metric priority 2) should ch11 die, to try to send data next in reverse flow, then the same at the other end so it could kill one link leaving the other used in half-duplex. I'm not sure how to setup a dynamic table in this sense that can open and close each line but I think I would need real stand-alone routers with RIP etc... so as not to always have a delay in sensing if the main flow line is working before trying the second.


Cheers,
Gavin.
Radio Engineer (getting in to pc networking, sick of mobile internet costs).