Business class comes with the SMC 8014 5 port switch + cable modem. Problem is that the thing was never intended to do what they are using it for and they cooked up their own firmware to make it work.

Under load, it will eventually lock up. My best guess is that it doesn't have enough memory to sustain a large number of NAT sessions. With 10-15 users, it locks up about every 2 weeks. With >40 users, it goes down about every day. The lock-ups can be total, but it can also manifest as a blockage of a frequently visited site.

They only (sad) solution is to throw them more money. If you pay for a fixed IP, then you can use your own router and switch the modem to bridge mode. Works pretty good.

Other than that, it is unrestricted as far as I have seen. (I work for a school these days. We have three dorms with 80 students each, one circuit per dorm. Can't think of a better test ;-) Once the modem is taken out of the loop, the connection itself works as it says on the tin.)