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In [[telecommunication]], a '''digital multiplex hierarchy''' is a hierarchy consisting of an ordered repetition of [[tandem]] [[digital]] multiplexers that produce signals of successively higher [[data]] rates at each level of the hierarchy.
Digital [[multiplexing]] hierarchies may be implemented in many different configurations depending on (a) the number of channels desired, (b) the [[Signalling (telecommunication)|signaling]] [[system]] to be used, and (c) the [[bit rate]] allowed by the [[telecommunication|communications]] media.
Some currently available digital multiplexers have been designated as Dl-, DS-, or M-series, all of which operate at [[T-carrier]] rates.
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