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In [[telecommunications]], a '''digital multiplex hierarchy''' is a hierarchy consisting of an ordered repetition of [[tandem]] [[digital multiplexer]]s that produce signals of successively higher [[data]] rates at each level of the hierarchy.<ref name="Weik 2000">{{cite book|title=Computer Science and Communications Dictionary|publisher=[[Springer Publishing]]|___location=[[Boston]], [[United States]]|isbn=978-0-387-33556-8|doi=10.1007/1-4020-0613-6|url=https://link.springer.com/referencework/10.1007/1-4020-0613-6|first=Martin H.|last=Weik|chapter=digital multiplex hierarchy|year=2000|s2cid=38594618 }}</ref><ref>{{cite journal|title=8 - Digital transmission hierarchies|journal=Digital Signal Transmission|publisher=[[Cambridge University Press]]|year=1992|first1=Chris|last1=Bissell|first2=David|last2=Chapman|doi=10.1017/CBO9781139172547.012|pages=263–285|isbn=9780521415378 |url=https://www.cambridge.org/core/books/abs/digital-signal-transmission/digital-transmission-hierarchies/57DB5A7D8CE85189525BE385B6345490|url-access=subscription}}</ref>
Digital [[multiplexing]] hierarchies may be implemented in many different configurations depending on; (a) the number of channels desired, (b) the [[Signaling (telecommunications)|signaling]] [[system]] to be used, and (c) the [[bit rate]] allowed by the [[communications media]].<ref name="Weik 2000" />
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