That's like saying because a Cheetah runs at 60mph it must also be a Car since my car goes 60mph.
T1 isn't a matter of speed, it's a different type of connection than DSL.
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DSL versus T1 T1 is a technology that bundles several phone lines together to provide downstream access speeds of 1.54 Mbps. This is a very respectable speed, and one of the benefits of T1 is that it allows a larger number of users to be connected at one time than do the other types of Internet access. However, most businesses find that they do just fine without T1 once its pros and cons are put into perspective. Since T1 requires the use of special lines, the installation process is lengthy and complicated, as is the process of connecting private networks from different regions. These are minor set-backs, however, once a further variable is added into the equation. The decision between DSL and T1 access becomes much more simple for most businesses once cost is considered. Generally speaking, a business can pay up to 4 times as much every month for a T1 line as it would for DSL. In other words, for the cost of a single T1 1.54 Mbps connection, you could install three 1.1 Mbps DSL connections. This is due in large part to the fact that DSL uses ordinary, preinstalled telephone lines. For this same reason, DSL also simplifies the installation process and the interconnection of multiple networks. When you look at these facts alone, it is easy to see why many have termed DSL the "T1-killer". DSL continues to blow away even its strongest competitors as more and more businesses become aware of its simplicity, affordability and its potential.