Each row entry represents an Alcatel 7x50 SR 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.