Hello,

I have an usb wifi nic, that I want to be able to power by battery, so I got a battery usb power supply. I didn't have a Y cable around so I have a stack of usb cables and deviced to make a "Y" cable, something like this:

N810 ------------------------ Wifi Nic
|
----------------- USB Power supply


Currently, I have the white and green data cables between the netpad and nic straight through.

I have the ground from all three connected together, and the red 5v line from the USB power supply connected to the red 5v line to the nic.

The final red 5v from the netpad is not connected to anything.

With this configuration, the Nokia recognises the wifi card, but I get "rejected 1 configuration due to insufficient available bus power"

I have confirmed the 5v is present from the USB power supply. It appears that the usb host on the netpad doesn't recognise it is getting power from elsewhere.

I have guessed at how to wire the voltage together. Is there something else I need to do to get this working?