This read-create object selects the interworking function type for this endpoint before it becomes active, choosing between network interworking and two flavors of service interworking, or rfc1973. This choice decides whether frame-relay frames crossing to ATM are carried essentially unmodified end-to-end for another frame-relay device, network interworking, or actually translated and encapsulated for an ATM-native peer, service interworking, and picking the wrong type is a classic cause of a connection coming up but exchanging garbled or undecodable payloads. Connecting a frame-relay CPE through this switch to a native ATM host requires serviceTranslation or serviceTransparent, while connecting two frame-relay sites through an ATM core calls for network interworking.