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The OID_ATM_SUPPORTED_SERVICE_CATEGORY OID requests an ATM miniport driver to return a list of the ATM service categories that it supports, as a proper subset of the following system-defined values:
ATM_SERVICE_CATEGORY_CBR
Constant Bit RateATM_SERVICE_CATEGORY_VBR
Variable Bit RateATM_SERVICE_CATEGORY_UBR
Unspecified Bit RateATM_SERVICE_CATEGORY_ABR
Available Bit Rate
An ATM miniport driver must support at least the Unspecified Bit Rate service category. The returned value is a bitwise OR of all the supported service categories--for example, ATM_SERVICE_CATEGORY_UBR | ATM_SERVICE_CATEGORY_CBR.