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Line 5: 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 [[Digital Signal Designation\|Dl-, DS-, or M-series]], all of which operate at [[T-carrier]] rates. In the design of digital multiplex hierarchies, care must be exercised to ensure [[interoperability]] of the multiplexers used in the hierarchy.

Digital multiplex hierarchy: Difference between revisions