The unique value which identifies this slot within a chassis in
the system. Depending upon the value of tmnxChassisType, this may
represent a fabric slot or a regular card slot. If this CPM module
resides on a fabric card, tmnxCpmCardSlotNum has the value the
corresponding tmnxFabricSlotNum. If this is a CPM module on a
fabric card, tmnxCpmCardSlotNum is the fabric slot number in the
chassis where this CPM module is located. Else if this is a
CPM card, tmnxCpmCardSlotNum is a regular card slot number.