Internet Connection not working - USB LAN connection - from particular modem

"The fact that it doesn't work with your router except in 10baseT mode is troubling, and suggests you might've gotten a bad unit.

If your router works with other devices in Autosense or 100baseT modes, and you've tried the USB dongle in multiple ports with the same results, consider returning it to the retailer in exchange for another.

On the other hand, if your router is older or you've had other devices that only operate in 10baseT mode with it, this may be a quirk of your equipment. Your friend's equipment might not have the same quirk, so try switching it back to Autosense or 100baseT for your friend's place."