I'm not a networking guru, so need a little help. Our office building has one 40MB uplink to AT&T. We have a new tenant that wants to share our internet, which is part of the lease agreement. I'm going to put a switch between the AT&T equipment, our firewall and their firewall. All simple. What I need though, is a switch where I can limit their upload/download speed to the AT&T internet device. Does such a device exist, and if so, can you share a link to the page/specifications?