The Frame Relay User-to-Network Interface (UNI) is a protocol that permits users to access private or public Frame Relay networks and to establish a communications path to another user within the same network.
The Network-to-Network Interface (NNI) makes connections possible between users connected to different Frame Relay networks. These separate Frame Relay networks can be considered as subnetworks within a complete network service.
Figure 4 shows the interconnection of these types of subnetworks and the location of NNI between them.
Figure 4: Interconnection and Relationship of NNIs and Subnetworks
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