This object defines the number of instances of a physical
resource.
Specific resource instances are physically located from
top-to-bottom on a particular module. If there are multiple
'columns' of a resource from the top to the bottom, then
the numbering will start from the left side and proceed
top-to-bottom in each column.
For instance, the first FNB ring will be instance 1 (top
in the chassis) while the second FNB ring is instance 2
(below FNB 1 in the backplane).