I am new to the Cisco gear.  I recently acquired a Aironet 4800 unit without a power supply.  I called Cisco and they do not offer one.  It appear to be 12-18VCD.  The unit only has 3 pins on the power supply. I can look inside, but was trying to avoid doing so.
 
Any help would be appreciated.  I'm still reading all of the previous posts.
 
Thanks,
 
Lewis Hipkins