AT&T made big headlines this week for unveiling a plan to cap monthly usage by its DSL subscribers at 150GB and its U-Verse subscribers at 250GB. Whereas other broadband ISPs like Comcast have long had a 250GB cap in place, what's different about AT&T's plan is that it is proactively saying it will charge $10 for every 50GB users exceed the limit. Other ISPs have tended to use the cap solely as a mechanism for throttling the tiny portion of users who exceed the cap, rather than as a way of generating extra revenue.
Confused yet? That's understandable. For now, there's no consensus on caps or how they should be implemented, and the reality is that for the vast, vast majority of today's broadband subscribers, they're irrelevant anyway. Even for those embracing Netflix streaming in a big way, caps are still relatively roomy. Further, broadband Internet service is an extremely high-margin business and so common sense suggests that rather than trying to stifle demand, broadband ISPs should be trying to encourage it. However, as Canadians, who live in an environment of ultra-low broadband caps can attest, that's not the way the world always works. There, supplemental broadband ISP charges are already suppressing enthusiasm for online video alternatives.