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ISDN Interface
The Am186CC/CH/CU microcontroller CDP development module provides both
ISDN S/T and U interfaces. You must use these interfaces independently unless
you have physically configured the module as a network termination (NT1) device
through a population option. The four-wire 2B+D S/T interface connects through
an RJ-45 connection at P2 by using the Am186CC communications controller with
the AMD Am79C32A DSC circuit. This connection provides the path between a
TE (terminal equipment) and NT1 device, and is the ISDN interface commonly
used in businesses and in Europe.
The two-wire 2B+D U interface uses the Lucent T7256A NT1 device. The NT1
device provides the termination point at the RJ-45 connection at P3 between the
local exchange (LE) and ISDN Terminal Equipment (TE1), and between the
terminal adapter (TA) and non-ISDN terminal equipment (TE2). The U interface
is the main ISDN interface provided in North America and Asia. The default
configuration of the NT1 in this design is to provide a connection between a TA
interface to a PC and a TE2 interface to two plain old telephone service (POTS)
phones. Refer to Figure 3-8 for an illustration of the ISDN reference points.
Three LEDs (CR4–CR6) are used to indicate activity on the ISDN B1, B2, and D
channels using Am186CC communications controller signals PIO18, PIO39, and
PIO32, respectively.
Figure 3-8. ISDN Reference Point Block Diagram
ISDN
Local
Exchange
(LE)
Ter m in al
Adapter
(TA)
ISDN Terminal
Equipment
(TE1)
Non-ISDN
Terminal
Equipment (TE2)
Network
(NT1)
Network
Termination Type 2
(NT2)
U
S/T
R
S
or
T
Termination Type 1
about.book Page 12 Monday, June 7, 1999 10:17 AM
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