GAP
GAP indicates the physical layer overhead time between different ONTs in upstream direction. According to the standard, physical layer overhead time (TPLO) consists of guard time (TG) + preamble Time (TP) + Delimiter time (Td).

Dbru
DBRu is the abbreviation of Dynamic Bandwidth Report upstream. The ONTs send the DBRu report for the given Alloc-ID.

Minbw
It is the minimize bandwidth that can be allocated to one ONT for one tcont.
