This object is a user-assigned asset tracking identifier (as specified by a network manager) for the physical entity, and provides non-volatile storage of this information. If the AssetId string associated with the physical component is not set, then this attribute will report a zero-length string. For the RPD main module Entity, the RPD should report the same value for attribute AssetId as the 'AssetId' attribute reported with GCP TLV 50.19.17. On the first instantiation of a physical entity, the value of AssetID associated with that entity is set to the zero-length string. Not every physical component will have an asset tracking identifier or even need one. Physical entities for which the associated value of the IfPhysEntityIsFRU object is equal to 'false(2)' (e.g., the repeater ports within a repeater module) do not need their own unique asset tracking identifier. An agent does not have to provide write access for such entities and may instead return a zero-length string. For the RPD main module Entity, the RPD must report the same value for attribute AssetId as the 'AssetId' attribute reported with GCP TLV 50.19.17.