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Connecting a Router to an ISDN Network Through ISDN BRI Interfaces
In Figure 14-1, RouterA and RouterB use ISDN BRI interfaces to connect to NT1 devices, and the NT1 devices connect to the ISDN network.
For details about ISDN service configuration, see ISDN Configuration in the Configuration Guide - WAN.
NT1 implements physical layer functions, including subscriber line transmission, loop detection, and D channel preemption. For details, see ISDN Reference Model in Configuration Guide - WAN.
