Bus 003 Device 002: ID 067b:2303 Prolific Technology, Inc. PL2303 Serial Port
[54027.595634] USB Serial support registered for pl2303
[54027.595855] pl2303 3-1:1.0: pl2303 converter detected
[54027.607264] usb 3-1: pl2303 converter now attached to ttyUSB0
So I analyzed it and found that it seemed like a 3.3V serial adaptor, so I had to start using it to access routers, mobiles, ... having also a broken Fonera power supply around (one of this typical Fonera problems where the power supply outputs the correct voltage but not enough intensity) I thought... if I put all this together I'll have a USB cable capable of powering La Fonera and also accessing it's serial port all in one and using just one USB slot.
And so... here is what I think is the definitive Fonera cable:
BTW: I have a Fonera model fon2200 and you have to power it and plug the cable after you see activity at the ethernet led, not before pluging power. On that model Gnd pin is the nearest to the power connector. More info at OpenWrt
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