The value of tmnxChassisOperMode indicates the operational scaling
and feature set for all IOM cards in the chassis. Changing the value
of tmnxChassisAdminMode from a greater mode to a lesser mode
(downgrade) will result in tmnxChassisAdminMode indicating the new mode
while tmnxChassisOperMode indicates previous mode until the
configuration is saved and the system rebooted, at which point, the
actual downgrade will take effect and both tmnxChassisAdminMode and
tmnxChassisOperMode will indicate the new mode.
Upgrading from a lesser mode to a greater mode (ie. From 'modeA' to
'modeB') will take effect immediately and the tmnxChassisOperMode will
indicate the same mode as that of tmnxChassisAdminMode.