This object displays human-readable textual string which
describes the cause of the last state change of the
module. This object contains zero length string
if no meaningful reason could be provided.
Examples:
'Invalid software version'
'Software download failed'
'Software version mismatch'
'Module is in standby state'
etc.
This object is for display purposes only.
NMS applications must not parse this object
and take any decision based on its value.