AT&T to Try Limits on Monthly Internet Traffic

AT&T will initially apply the limits in Reno, Nev., and see about extending the practice elsewhere.

Increasingly, Internet providers across the country are placing such limits on the amount of data users can upload and download each month, as a way to curb a small number of “bandwidth hogs" who use a lot of the network capacity. For instance, 5 percent of AT&T's subscribers take up 50 percent of the capacity, spokesman Michael Coe said Tuesday.

But the restrictions that Internet providers are setting are tentative. And the companies differ on what limits to set and whether to charge users for going beyond the caps.

Starting in November, AT&T will limit downloads to 20 gigabytes per month for users of their slowest DSL service, at 768 kilobits per second. The limit increases with the speed of the plan, up to 150 gigabytes per month at the 10 megabits-per-second level.

To exceed the limits, subscribers would need to download constantly at maximum speeds for more than 42 hours, depending on the tier. In practice, use of e-mail and the Web wouldn't take a subscriber anywhere near the limit, but streaming video services like the one Netflix Inc. offers could. For example, subscribers who get downloads of 3 megabits per second have a monthly cap of 60 gigabytes, which allows for the download of about 30 DVD-quality movies.

The limits will initially apply to new customers in the Reno area, AT&T said. Current users will be enrolled if they exceed 150 gigabytes in a month, regardless of their connection speed.