The rate shown on the utility is only a connection rate, the actual theoretical transfer rate of device is about 30-50% of the connection rate. However, this actual [FONT=Calibri]theoretical transfer...

the scan utility can help you to open the web page http://www.tp-link.com/en/download/TL-WPA4220_V1.html#Utility the last one

http://forum.tp-link.com/showthread.php?94113-How-To-Make-TP-LINK-TL-WN823N-(EU)-V.2.0-Work-On-Kali-Linux try this

yes,powerlines are compatible.

seems like the power trip demaged the powerline.contact the retailer or local support to see if they can offer a replacement

are there any electrical appliance? high-power devices may affect the performance