This string holds the intId — an internal identifier UCS Manager's capability-catalog engine uses to reference the capability entry recording which physical ports on a piece of UCS gear are certified to accept passive optical/AOC cabling instead of copper twinax — distinct from any customer-facing name. intId is mainly for UCS Manager's own internal bookkeeping rather than something an admin types in directly, but it becomes the key to hand over when working with a Cisco TAC engineer diagnosing why an optical-cabling restriction is being applied to a particular port set. A value like 'OPT-CAP-0092' as the intId would be Cisco's internal catalog key for this specific entry, not something displayed under a friendly name in the UCS Manager GUI.