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Internet access refers to the means by which users connect to the Internet.
History and types of connections
Common methods of Internet access include dial-up, landline (over Cable Internet access, Optical fiber or Twisted pairs), T- lines, Wi-Fi, satellite and cell phones.
Dial-up connections are the most common type of Internet connection available from ISPs and the slowest and (usually) the least expensive. A dial-up connection allows users to connect to the Internet via a local server using a standard 56k modem, the PC literally dials (hence the name) a telephone number (provided by the Internet Service Provider) and connects to the servers modem and therefore the Internet. Once connected users are free to search the web as they please, however, compared to modern speeds of broadband Internet, dial-up is very slow and can only nominally transfer at 56 Kilobits per second
Asymmetric digital subscriber lines (ADSL) have become a widely available Broadband Internet access connection, providing a variety of data rates. The connections work by splitting the function of a phone line into separate channels for voice telephone calls and for data (Internet). Thus, a user can talk on the phone and be connected to the Internet at the same time. ADSL connection services are sold with different speed specifications, below are some common configurations for download/upload speed:
* 512kbit/s/128kbit/s
* 1 Mbit/s/256kbit/s
* 3 Mbit/s/768kbit/s
Cable Internet access, the principal competitor to DSL, is offered at a range of prices and speeds overlapping that of DSL, but tends to concentrate more on the high end of the market.
Wireless connections
Wi-Fi provides wireless access to computer networks, and therefore can do so to the Internet itself. Hotspots providing such access include Wi-Fi-cafes, where a would-be user needs to bring their own wireless-enabled devices such as a laptop or PDA. These services may be free to all, read more at » http://en.wikipedia.org/wiki/Internet+access
http://en.wikipedia.org/wiki/Internet+access
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