A T2 line, for example, consists of four aggregated T1 lines.
Similarly, a T3 line consists of 28 T1 lines.
The two kinds of terminology can be used interchangeably in most contexts.
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There is no physical T0 line.
While T-carrier communications were deployed throughout North America, Europe adopted a similar standard called E-carrier.
A T1 line does not have nearly enough capacity to support significant demand for internet usage nowadays.
T3 line costs are proportionately higher than those for T1 lines.
