by 
The Curious Bag
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T1 lines are broadband Internet connections which run over telephone wires that transmit digital signals. This type of connection has incredible reliability, but does not come cheap.
Features
T1 Internet connections transfer data upstream and downstream at speeds of up to 1.5 megabytes per second--30 times faster than a dial-up line. In addition, they can support hundreds of users on a single line.
Considerations
In general, only businesses need and can afford a T1 connection. T1 lines are geared toward companies that require at least a dozen direct connections.
Types
T1 services sometimes come integrated--meaning the user can dedicate specific connections to data or voice. They can also come as fractional connections prorated in return for lower bandwidth. Some ISP's also offer "pay as you go" T1 lines and dual T1 lines that essentially just combine the bandwidth of two lines into one.
Reliability
Most people or businesses that consider a T1 line do so for reliability. A quality Internet service provider will guarantee a 99.99 percent working rate and offer a refund for excess downtime.
Price
T1 connections range from about $279 per month to almost $600 per month. Costs usually increase with distance from a telephone company's servers.
Source:
AllBusiness.com; FAQs about T1 Internet Access
Yahoo! Small Business: Understanding T1 connections
More Information:
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