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Am186™CC Microcontroller Router Reference Design User’s Manual

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ISDN Interface

The Am186CC microcontroller router reference design provides both ISDN

S/T and U interfaces. The four-wire 2B+D S/T interface connects through an

RJ-45 jack (P2 at location F-1) by using the Am186CC microcontroller with the

AMD Am79C32A digital subscriber controller (DSC) circuit. This connection

provides the path between the router and an NT1 device. The S/T interface is the

ISDN interface commonly used in Europe.

The two-wire 2B+D U interface uses the Lucent T7237A U transceiver. The U

transceiver provides terminal adapter functionality connected through an RJ-45

jack (P3 at location H-1). The U interface is the main ISDN interface used in North

America and Asia.

Three LEDs (CR4–CR6) at location F-9 (schematic sheet 5) are used to indicate

activity on the ISDN B1, B2, and D channels using Am186CC microcontroller

signals PIO18, PIO39, and PIO32, respectively.

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Eurotech BRI ISDN Manual de usuario Pagina 44