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In [[
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
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.<ref name="Weik 2000" />
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.
==See also==
* [[Digital transmission hierarchy (disambiguation)|Digital transmission hierarchy]]
* [[Plesiochronous digital hierarchy]]
* [[Synchronous digital hierarchy]]
* [[Transmission (telecommunications)]]
==References==
{{Reflist}}
*{{FS1037C MS188}}
[[Category:Multiplexing]]
{{telecom-stub}}
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