Each row entry represents an Alcatel-Lucent SROS series manufactured
hardware component.  Entries cannot be created and deleted via
SNMP SET operations.  When an entry is created in one of the
card tables, IOM, CPM, Fabric or MDA, a tmnxHwEntry is created
for the common hardware management information for that card
in that chassis.  When the card  is removed from the chassis,
its corresponding tmnxHwEntry is deleted.

The tmnxHwIndex is bitmapped:

| 32       25 | 24       17 | 16        9 | 8         1 |
+-------------+-------------+-------------+-------------+
| TmnxHwClass |   00000000  |     Slot    |     number  |
+-------------+-------------+-------------+-------------+

The Slot field is only used for components on cards in
slots. It is zero for all others.

The number field starts from 1 and indicates which component.
E.g. Power supply 1 or 2.