MIL-STD-188-176
networks and public networks. Two types of subscriber-network elements may be connected at the ATM network UNI: ATM and
non-ATM.
4.2.2.1 ATM subscriber-network elements . ATM subscriber- network elements (voice, data, and video terminals) connected directly to ATM networks shall generate ATM cells and comply with the ATM UNI specification (see Figure 1 and Figure 2 for ATM
UNI). Reference MIL-STD-187-700A, Figure 1 and sections 1.6
and 3, for definitions and use of terms such as subscriber-
network elements. The base ATM network shown in Figure 2 is expanded in Figure 3. The base ATM and private network node interface (P-NNI) is described in 5.4.
ATM UNI
ATM
End System
ATM Switch
a. ATM user connection
Non-ATM Interface
ATM UNI
Non-ATM End System
ATM Adapter
ATM Switch
b. Non-ATM user connection
FIGURE 1. ATM UNI and Non-ATM Interface.
4.2.2.2 Non-ATM end systems . Non-ATM end systems are connected to ATM networks by means of ATM adapters (AA) (see
Figures 1b and 2). The term non-ATM end systems includes all end systems that are not ATM. It does not exclude end systems
connected via permanent connections or connections established by an authorized third party. Non-ATM end systems are connected via non-ATM interfaces. AAs include all functions necessary for interworking between ATM switches and non-ATM end systems. AAs may be located in ATM access switches or may be located separately, as shown in Figure 1b. ATM networks allow
information exchange between and among ATM end systems and non- ATM end systems. AAs include an AAL. The AAL segments data provided by non-ATM terminals into cells. End-system data may be
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