Digital multiplex hierarchy: Difference between revisions

Revision as of 03:10, 30 August 2018

Revision as of 22:34, 18 March 2019

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{{Unreferenced|date=January 2008}}

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In [[telecommunication]]s, 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.

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In the design of digital multiplex hierarchies, care must be exercised to ensure [[interoperability]] of the multiplexers used in the hierarchy.

*[[==Digroup]]==

'''Digroup''' is an abbreviation for '''[[Digital data|digital]] group.''' In [[telephony]], a basic group in the [[digital multiplex hierarchy]].

In the North American and Japanese [[T-carrier]] digital hierarchies, each digroup supports 12 PCM voice channels or their equivalent in other services. The DS1 [[Line (electrical engineering)|line]] rate (2 digroups plus overhead bits) is 1.544 Mbit/s, supporting 24 voice channels or their equivalent in other services.

In the [[E-carrier]] European hierarchy, each digroup supports 15 PCM channels or their equivalent in other services. The DS1 line rate (2 digroups plus overhead bits) is 2.048 Mbit/s, supporting 30 voice channels or their equivalent in other services.

==References==

{{FS1037C}}

==See also==

*[[Digroup]]

*[[Plesiochronous digital hierarchy]]

*[[Synchronous digital hierarchy]]