The latest firmware of W9980 fixed the bug that the speed dropped on the BT line of UK when G.INP was enabled. Upgrade it and test. :) http://uk.tp-link.com/download/TD-W9980_V1.html#Firmware

Wow, how did you find it out? Good job! What's the hardware version and firmware verison of your TD-W8970? You can report bugs here. :) http://ticket.tp-link.com/index.php?/Tickets/Submit

Where is the FTP server? In the same network as mobile and laptop? Ensure IP settings are correct and its IP address should be in the same subnet as the mobile and laptop.

The one connected to your PC has no lights but other two are working OK? Tried different sockets? Sounds like it is completely dead. Is it still under warranty? http://uk.tp-link.com/support/rma/

Do you need passthrough feature? If not, the most proper one should be TL-PA4010KIT. http://uk.tp-link.com/products/list-18.html

For Windows XP: 1. Click on start menu and goes to printers and faxes 2. Open Properties on the printer you want to share by print server: 3. Select Port tab, choose the port your printer uses and...