Bandwidth cap

A data cap, often erroneously referred to as a bandwidth cap, is an artificial restriction imposed on the transfer of data over a network. In particular, it refers to policies imposed by an internet service provider in order to limit customers' usage of their services; typically, exceeding a data cap would require the subscriber to pay additional fees based on whether they have exceeded this limit. Implementation of a bandwidth cap is sometimes termed a fair access policy, fair usage policy, or usage-based billing by ISPs. U.S. ISPs have asserted that bandwidth caps are required in order to provide a 'fair' service to their respective subscribers. The use of bandwidth caps has been criticized for becoming increasingly unnecessary, as decreasing infrastructure costs have made it cheaper for ISPs to increase the capacity of their networks to keep up with the demands of their users, rather than place arbitrary limits on usage. It has also been asserted that bandwidth caps are meant to help protect pay television providers that may also be owned by an ISP from competition with over-the-top streaming services. Although often referred to as a 'bandwidth cap', it is not the actual bandwidth (bits per second) that is limited, but the amount of data downloaded per month. Generally, each user of a network is expected to use high speed transmission for a short time, for example to download a megabyte web page in less than a second. Continuous usage, such as when sharing files or streaming videos can seriously impair service for others. In DSL, where the core network is shared but the access network is not, this concept is less relevant. However, it becomes more relevant in cable internet, where both the core network and the access network are shared, and on wireless networks, where the total network bandwidth is also relatively narrow. In 2016, U.S. provider Comcast offered a service plan with a data cap of 1 terabyte. At contemporary data consumption rates, each member of a family of four would need to separately watch 100 movies in a month to approach the cap. In that case, typical data usage habits would not exceed that cap. 'Unlimited data' is a marketing promotion in which an Internet service provider offers access to Internet without cutting service at the data cap. However, after a user passes some data cap, the provider will begin bandwidth throttling to decrease the user's speed of access to data, slowing down the user's internet use. As of October 2015, there were 58 wired broadband providers in the US that used data caps, among them major wireless cell phone providers such as Verizon Wireless and AT&T. Before 2010 there was a trend of providing unlimited data without bandwidth throttling. In the United States the Federal Communication Commission has fined service providers for offering unlimited data in a way that misled consumers. In June 2015, the FCC fined AT&T Mobility US$100,000,000 for misleading consumers. In October 2016 the FCC reached a settlement with T-Mobile in which they would pay US$48,000,000 for failing to disclose restrictions on their unlimited data plans.