Also see the T-carrier system, of which the T1 is a part.
The T1 (or T-1) carrier is the most commonly used digital line in the United
States, Canada, and Japan. In these countries, it carries 24 pulse code
modulation (PCM) signals using time-division multiplexing (TDM) at an overall
rate of 1.544 million bits per second (Mbps). T1 lines use copper wire and
span distances within and between major metropolitan areas. A T1 Outstate
System has been developed for longer distances between cities.
It's probable that your Internet access provider is connected to the
Internet as a point-of-presence (POP) on a T1 line owned by a major telephone
network.
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