The Dialogic BRI/2 provides ISDN network access via the Basic Rate Interface (BRI). The BRI/2 also supports features such as a digital station interface, enabling direct access to BRI station sets (telephones) from PC-based computer telephony (CT) systems. The BRI/2 connects directly to a EURO-ISDN NTI or NT2 device.
The BRI/2 front-end interface complies with all ETS 300 012 and ANSI T1.605 requirements. The circuitry uses a BRI "S/T" interface, IOM-2 to PCM conversion, and HDLC serial communications. Figure 1 shows the how the BRI/2 interface compares to the standard ISDN model.
Figure 1. BRI/2 Interfaces
An NT1 device handles OSI (Open Systems Interconnection) model layer 1 functions such as the physical connection between the ISDN network and user devices. It splits the duplexed transmit and receive signals from the ISDN network (over the U interface) into separate transmit and receive components.
An NT2 device provides the physical and electrical termination for an ISDN line. It provides an interface between the twisted-pair wires used by the PBX, and the wires used by the BRI/2. A device designated as TE1 (Terminal Equipment) is any end-user equipment that uses ISDN protocols and supports ISDN services. The interface between an NT1 device and an NT2 device is called an "T" interface.
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