Need help how to find out what chipset I need

[CTB986]

I need a wireless USB Ethernet port for linksys, but I don't know what chipset I need. I have an ARRIS DG860 router. How do I figure out what chipset I need? Any suggestions?

 

[Emerald]

this one should work AE3000-NP

http://www.newegg.com/Product/Product.aspx?Item=N82E16833124477