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- There is no formal specification about the "nature" of the equipment ... is it a single card device or a Router with shelf, containing card, containing modules.
{Martin Skorupski] the parent/child association is done by pointing from "holder" to "equipment" using the "occupied-field-replacable-unit (FRU)". The "nature" is given by the vendor in the "manufacture" area. Its values are vendor-specific and due to disaggregation (and re-aggregation) there is not and must not be a kind of standard "nature" - The "nature" of a network function can be exposed from the exposed APIs, but how this maps to equipment is room for innovation and unknown to generic implementations of ONAP. - The mapping can take place by knowing about "textual" keywords or "inventory numbers"-logics of manufacturers
{Martin Skorupski] correct! - it is equipment/vendor/operator specific -
For ietf-hardware (as used by O-RAN Fronthaul please see "iana-hardware" - each NetConf server can define its "nature" (e.g Chassi, Backplane, SFP, ...)
Please use https://www.iana.org/assignments/iana-hardware/iana-hardware.xhtml for the identification of the "nature".