Editing Digital multiplex hierarchy (section)

==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&nbsp;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&nbsp;Mbit/s, supporting 30 voice channels or their equivalent in other services.