{
                        .Header                 = {.Size = sizeof(USB_Descriptor_Interface_Association_t), .Type = DTYPE_InterfaceAssociation},
 
-                       .FirstInterfaceIndex    = 0,
+                       .FirstInterfaceIndex    = INTERFACE_ID_CDC1_CCI,
                        .TotalInterfaces        = 2,
 
                        .Class                  = CDC_CSCP_CDCClass,
                        .Header                 = {.Size = sizeof(USB_CDC_Descriptor_FunctionalUnion_t), .Type = DTYPE_CSInterface},
                        .Subtype                = CDC_DSUBTYPE_CSInterface_Union,
 
-                       .MasterInterfaceNumber  = 0,
-                       .SlaveInterfaceNumber   = 1,
+                       .MasterInterfaceNumber  = INTERFACE_ID_CDC1_CCI,
+                       .SlaveInterfaceNumber   = INTERFACE_ID_CDC1_DCI,
                },
 
        .CDC1_ManagementEndpoint =
                {
                        .Header                 = {.Size = sizeof(USB_Descriptor_Interface_Association_t), .Type = DTYPE_InterfaceAssociation},
 
-                       .FirstInterfaceIndex    = 2,
+                       .FirstInterfaceIndex    = INTERFACE_ID_CDC2_CCI,
                        .TotalInterfaces        = 2,
 
                        .Class                  = CDC_CSCP_CDCClass,
                        .Header                 = {.Size = sizeof(USB_CDC_Descriptor_FunctionalUnion_t), .Type = DTYPE_CSInterface},
                        .Subtype                = CDC_DSUBTYPE_CSInterface_Union,
 
-                       .MasterInterfaceNumber  = 2,
-                       .SlaveInterfaceNumber   = 3,
+                       .MasterInterfaceNumber  = INTERFACE_ID_CDC2_CCI,
+                       .SlaveInterfaceNumber   = INTERFACE_ID_CDC2_DCI,
                },
 
        .CDC2_ManagementEndpoint =