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Compare T1, T3 and DSL Connections

T1 Line Connection

A T1 Line produces a high speed Internet connection, operating at about 1.5 million bits per second.  Most T1 users are small and medium sized businesses whose employees use the Internet in large capacities. Many computers can be connected to a T1 network without affecting the speed or reliability of the connection.  Although the T1 line would be nice for home use because of its speed and ability to send and receive large files, it is rare that people have a working T1 line in their homes because of the unnecessary amount of bandwidth and high costs. 

A T1 line works digitally to transmit information over the Internet and provide a high speed connection to computers in the network.  It uses 23 channels with pulse code modulation signals to provide the speedy and reliable connection to the network. 

T3 Line Connection

T3 lines are incredibly fast Internet connections, operating at 45 million bits per second.  Most T3 lines are used by very large companies and universities with high traffic.  Many computers can be connected to the Internet at the same time without the speed being affected with a T3 line.  Additionally, T3 lines support the transmission of very large files over the Internet, such as videos and large databases. 

DSL Connection

DSL, also known as Digital Subscriber Line, provides a high speed Internet connection that operates through digital signals being sent over telephone lines.  Even though the connection works over the phone line, it does not tie up or interfere with the phone line.  The bandwidth that is available through phone lines has a much larger capacity than is typically used, therefore, a DSL line can send out digital pulses through the extra frequency that is not being used.

DSL connection speeds vary.  Most companies make DSL connections available for a monthly charge at various speeds, so they can accommodate the specific Internet needs of their customers.  The downstream rates usually run between 128 Kbps to 6 Mbps.  The majority of upstream rates range from 128 Kbps to 512 Kbps.  These speeds are representative of asymmetric DSL, where the upstream and downstream rates differ.  Symmetric DSL, where the upstream and downstream rates match, is also available through some Internet service providers.

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