Origin of Name
The name T1 came from the carrier letter assigned by AT&T to the technology. Essentially, the "T" is a part number that was assigned by AT&T. Just as there is the generally known L-carrier and N-carrier systems, T-carrier was next letter available and T1 is the first level in the hierarchy. DS-1 meant "Digital Service – Level 1", and had to do with the service to be sent (originally 24 digitized voice channels over the T1). The terms T1 and DS1 have become synonymous and include a plethora of different services from voice to data to clear-channel pipes. The line speed is always consistent at 1.54 Mbit/s, but the payload can vary greatly.
Read more about this topic: Digital Signal 1
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