Each row entry represents a chassis in the system. The agent
creates the row for the first chassis in the system, with
tmnxChassisIndex = 1, which is auto-discovered by the active CPM
card. Additional chassis entries can be created and deleted via
SNMP SET operations. Creation requires a SET request containing
at least tmnxChassisAdminMode and tmnxChassisRowStatus. Note
that the first Alcatel-Lucent 7x50 series product release does not
support multiple chassis, therefore there will not be more
than one row entry in this table; attempts to create additional
rows in this table will be denied.