wifi power on/off

[Yioryos Asprobounitis]

I'm trying to cycle the power of the wifi card on the XO-1{.5] but after half 
an hour of fruitless searching of the  list/wiki/web  I thought to ask, since I 
remember being discussed here.
Could please someone points to the terminal commands to turn off and on power 
on the usb8388 and sd8686 modules/cards?
Thanks 
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