fies a temporary connection between two (or more) using layer elements. May be translated to a CEi in each layer interface. ce1,data {c1,data} GT (Global title): An address that identifies a user of a switching layer in a numbering system that is independent of the numbering system of the switching layer. Requires translation to address parameters of the switching layer. ITi (Interface-type identifier): A protocol parameter that supports discrimination within an agent between layer interfaces and actor-agent interfaces. May be combined with an APi for layer inter- faces. ITi=1 {ITi, APi,...} ITi=0 Li (Link identifier): A protocol parameter that indirectly identifies one of a number of actor-agent interfaces in a multiplexing layer element aai111 {Li{11,12},...} aai24-12 AAI value Lli (Layer-interface identifier): Identifies a layer interface in a layer structure model. This identifier can be used for simulation or translated to addresses of the platform on which the layer ele- ments run. data2 data1 {ap1,data1} li1<>ap1 li2<>ap2 {ap2,data2} NA (Network address): Most NAs are defined as concatenations of diverse operator network identifiers and serial numbers (sometimes named "subscriber number"). The international tel- ecommunication numbering system is described in ITU-T E.164, and a number of other ITU-T recommendations for its application on different network systems. IP addresses are assigned by the NIC (Network Information Center). The IP number- ing system is described in RFC 1166. NWi (Logical-network identifier): This is an AMLn-defined parameter that refers a logical network (hosted or hosting), not to be confused with operator network identifiers in NAs. PA (Platform application address): This parameter is used in simulation and execution of a model on a particular processing platform. Two PAs are defined for each layer interface. REi (Route-endpoint identifier): Identifies a route endpoint. Only known by the logical node that terminates the route. Must be translated to an REdef before data can be sent 