User`s manual

Am186™CC Microcontroller Router Reference Design User’s Manual
2-18
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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