This DisplayString, 1 to 31 characters, is simply the human-readable name assigned to a PM interval profile, per its DESCRIPTION ('Name for the PM interval profile.'). Because a single interval profile can be attached to many PM instances at once, giving it a descriptive name (rather than referring to it only by its numeric index) is what lets an operator recognize at a glance which threshold policy a given DS3 port or Basic Tx instance is following when browsing cienaCesPmInstanceIntervalProfileIndex. For example, naming a profile 'DS3-Strict-5min' versus 'Backbone-Loose-1hr' immediately tells a technician which ports are being watched tightly and which are on a more relaxed threshold policy, without having to cross-reference every threshold field by number.