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IEVref:704-10-09ID:
Language:enStatus: Standard
Term: group
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Definition: 1. the assembly, obtained by frequency division multiplexing of a specified number of FDM telephone channels, normally 12, in adjacent positions in a frequency band of specified width, constituting the first level in the standardized frequency division multiplex hierarchy

2. a frequency band of standardized width, 48 kHz, in a multichannel carrier system and occupying one of a number of specified positions in the spectrum

NOTE 1 – A group is normally an assembly of 12 FDM telephone channels, each of 4 kHz bandwidth. But in some systems, for example those systems used over submarine cables, a group is an assembly of 16 FDM telephone channels, each of 3 kHz bandwidth.

NOTE 1 – Signals, other than those derived from FDM telephone channels, may occupy the whole or a part of the frequency band normally assigned to a group.


Publication date:1993-08
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