Keep the supported PT-1400-1GE-ADNSG platform under an Infoblox ISP L3+ maintenance term for one year. PT-MAIN-SUBS-1400DC-HA-ADP-S21 is a maintenance service entitlement rather than an appliance, adapter, or expansion component. Its scope is tied specifically to the named supported platform and establishes a defined 1-year maintenance period at the ISP L3+ service characteristic. Use this service where the PT-1400-1GE-ADNSG platform is already in operation and requires the stated maintenance tier for its next coverage period. The service code should remain associated with that supported platform; it is not a general-purpose maintenance subscription for unrelated Infoblox systems. Keeping the supported-platform designation explicit helps prevent coverage from being assigned to a different appliance configuration or mistaken for equipment supplied with the service. For service records, classify this item as maintenance rather than a software license or physical accessory. The ISP L3+ designation identifies the maintenance characteristic, while the covered period is 1 year. It does not add appliance ports, interfaces, capacity, or replacement hardware. Select it when the requirement is continuing maintenance coverage for the specified PT-1400-1GE-ADNSG platform under the stated Infoblox service tier.