This attribute indicates if the framing mode will be in accordance
with the CCITT G.751 or G.832 specification. The G832
component will appear under the E3 component when this attribute
is set to g832. This attribute may only be set on cell-based card
types. Note also that this attribute may only be set to g751 if the
mapping attribute is set to plcp.
The default value of this attribute will be g751 for frame-based
cards, and g832 for cell-based cards.
Note: when E3 framing is changed from g832 to g751, the G832
component must be deleted.