Description: This value is either zero(0) or the index of another row in this table. If it is not zero(0), it is the index of another row in this table which describes the parent timeslot to the timeslot associated with this row. A parent timeslot is another timeslot which is carved into smaller timeslots, one of which is this current timeslot. For example, a row in this table describing a VT1.5 always has an outerIndex which identifies a row in this table which describes a VT group. A VT group always has an outerIndex that describes a STS-1. The row describing the STS-1 has an outerIndex which identifies a row describing an OC3 SONET interface or perhaps, in the future, an STS12 within an STS48. Thus this object describes a nesting of timeslots. To continue the previous example: an STS-1 with 28 VT1.5's within it is represented by 36 rows in this table; 28 of which identify and describe each VT1.5. Every 4 VT rows have a corresponding VT group (vtgroup) for a total of 7 more rows. Each of the 4 VT1.5 rows that make up the VT group have an indentical value for outerIndex (index of the VT group row that the VT1.5's are associated). Each of the 7 VT group rows have an identical value in outerIndex (index of the STS-1 row that the VT groups are associated).