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Layer
In telecommunications, the term layer has the following meanings:
1. In radio wave propagation, see F region.
2. In telecommunications networks and open systems architecture, a group of related functions that are performed in a given level in a hierarchy of groups of related functions.
Note: In specifying the functions for a given layer, the assumption is made that the specified functions for the layers below are performed, except for the lowest layer.
Source: from Federal Standard 1037C
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