MIL-STD-188-176
5.5 Interworking . Interworking with non-ATM end-systems and networks is described in 5.5.1 and 5.5.2.
5.5.1 Interworking with non-ATM end-systems . Non-ATM end-systems shall be connected to ATM end-systems via ATM networks by means of ATM adapters (AA), as shown in Figure 10. For switched service, the AA shall map the non-ATM signaling protocol to the signaling protocol of AF UNI Specification, section 5. For non-switched service, a PVCC must be preestablished. On the end-system side, the AA must also match the physical and link layers unique to the specific non-ATM interface. In some cases, such as stream data, the link layer may be null. On the ATM network side, the AA must match the AAL protocol used by the interconnected ATM end system. The interconnected ATM end system may be another AA, as shown in Figure 11. The AAL protocols may be any of the standard AAL protocols described in 5.2.
5.5.2 Interworking with non-ATM networks . ATM networks support interworking with other ATM networks and optionally non- ATM networks (Figure 12). When interworking with non-ATM networks, interconnection shall be via ATM adapters, which include standardized service-specific convergence functions. Interworking examples are described in 5.5.2.1 through 5.5.2.4.
5.5.2.1 Narrowband ISDN . Interworking in the control plane between N-ISDN and B-ISDN is illustrated in Figure 13a. In this case the ATM network is acting as a transit network between two
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