The Plesiochronous Digital Hierarchy
Based on the E1 signal, the ITU-T defined a hierarchy of plesiochronous signals that enables signals to be transported at rates of up to 140 Mbit/s. This section describes the characteristics of this hierarchy and the mechanism for dealing with fluctuations in respect to the nominal values of these rates, which are produced as a consequence of the tolerances of the system.
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—C. Wright Mills (1916–1962)