16.2. T-Series Connections
The basic, first level in bandwidth or speed for leased lines that provide synchronous connections between sites is known as the T1 line. It serves up 24 Digital Signal 0 (DS0), 64Kbps channels in our country, Japan, and South Korea. A slightly bigger/faster version with 30 DS0 channels is available in Europe; it's called the E1 or E carrier line.
The name T1 came from the carrier letter assigned by AT&T to the technology. They are also known as T carrier lines. Essentially, the T is a part number that was assigned by AT&T. T1s offer Digital Signal 1 (DS1) bit patterns to transmit packets; DS1 has to do with the service to be sent over a T1—originally, 24 digitized voice channels. The terms T1 and DS1 have become synonymous ...
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