Airave and bandwidth

I've just gotten a Sprint Airave -- a box that acts as a micro cell tower and sends the voice signal across the Internet to the public telephone network -- and I thought I'd see how it works when you are limited in bandwidth.

So, I'm downloading a whole stack of files, using over 600kb/sec of bandwidth (the cable modem only handles about 680kb/sec) and got on a conference call.  

Everything seems to be working fine!  Fancy...