TECHNICAL REFERENCE AND USER’S GUIDE
REV AAA
IA12 ISDN ADAPTOR
TECHNICAL INTRODUCTION
IA12 ISDN is a EURO-ISDN BRI compatible adaptor that serves as a converter between
analog lines of the MS-series exchanges (MS48S, MS128, MS224) and ISDN BRI lines
coming from local CO (NT1).
TECHNICAL SPECIFICATIONS
An IA12 ISDN Adaptor with basic capacity can serve an ISDN BRI line. That capacity could
be increased by addition of the EXP-IA12 expansion card, which supports one ISDN BRI
line, to IA12.
Since each ISDN BRI presents two speech channels, IA12 with EXP-IA12 can convert 4
analog lines of the MS systems to 2 ISDN BRI lines, whereas IA12 without EXP-IA12 can
convert only 2 analog lines to 1 ISDN BRI line.
The IA12 ISDN Adaptor communicates with the MS systems over the serial data line (KTS
line). At most 3 IA12’s can be connected to an MS system. However, in that case it is
possible to install an EXP-IA12 in the third adaptor.
Current ISDN line capacities of the MS systems have been explained in the example
below:
The IA12 motherboard is connected by an 8-pin, RJ45 socket to the S0 that comes
from the NT1, to the A/B terminals of analog lines of the MS systems by two clip-type
connectors and to the serial data line by a 6-pin, RJ-type jack. At one end of the data
cable, which comes with the IA12, there is the connection box and at the other end there
is an RJ jack.
The EXP-IA12 expansion card is connected by an 8-pin, RJ45 socket to the S0 that
comes from the NT1, to the A/B terminals of analog lines of the system by two clip-type
connectors. The EXP-IA12 expansion card comes with a flat cable for connection to IA12,
which fits the 20-pin connectors of the IA12 motherboard and the EXP-IA12 card.
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Moreover, there are three LEDs on the IA12 motherboard in order to monitor status of
the S0 line, as well as the data line. The LED at the right is turned on while the adaptor
and the ISDN line that is connected to the IA12 motherboard is operating simultaneously,
the LED in the middle is turned on while the adaptor and the ISDN line that is connected
to the EXP-IA12 card is operating simultaneously and the LED at the left is turned on
while the adaptor and the data line is operating simultaneously.
Appearances of theIA12 Motherboard and the EXP-IA12 card have been illustrated below;
Figure -1
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Figure -2