@am959 et al:
I think there was a thread wrt this on this forum a couple of years ago; you might want to do a search for it. However, the "copper wire table" predicts for an 18 guage (often used for lamp cord) a resistance of approx. 6.5 ohms/1000 ft. If you used 10 ft. for your extra cable, the added resistance would be .065 ohms; which at 1.2 amps (camera spec.) would result in a voltage drop of less than 0.1 volt at the camera. Compare this to a line voltage flucuation of 10 volts on a nominal 115 volt line. IF this were transformed to 5 volts needed by the camera, the voltage change would be 0.4 volts. Of course, this should not happen with a switching regulator of decent design.
All that being said; if you used a common extension cord to reach from the wall socket to near the camera power supply, you should not have any problem with a voltage drop, assuming that dlink's engineers have done their homework for the equipment you have purchased. Not sure about this, as I believe if the camera malfunctions because of 0.1 volt drop, that is not very good endineering.
OTOH, 1000's of these cameras are in use with the power cube supplied, and I don't hear about any problems. So, bottom line: Use an extension cord.
Regards,
Bob