The managed object is used for identify the target on which
the maintenance operation should be performed. The target can
be a chassis, a plug-in module, and a port.
The value of the object will be:
(Chassis_id * 10000 + slot_id * 100 + port_id)
where
chassis_id: 0~3,
slot_id: 1~16,
port_id: 1~24