Karel MS224 Installation & Maintenance Guide
Edition 3.2
32
The external callers can make use of the EVM224 facilities, only if they have DTMF
telephone sets in order to be able to key in numbers whenever required by
EVM224.
The outlook of EVM224, EVM-FE and EVM-DE cards is illustrated in the following
figure.
Figure A-20
EVM224 is located on the empty space inside the left cover of the system cabinet
and connected to the 6-pin RJ socket (called VM) on MS224 CPUKON card via the
6-pin cable that comes already installed over the bottom rear part of the system
rack.
The dimensions of EVM224 are 9 cm x 18 cm and the weight is 0.1 kg.
The dimensions of EVM-FE and EVM-DE are 6.5 cm x 3.5 cm.
II.6.
ISDN ADAPTOR – IA12, EXP-IA12
The IA12 ISDN Adaptor is an ETSI compatible terminal adaptor that serves as an
interface between the ISDN BRA-S0 lines coming through the network terminator
(NT1) of PTT and the analog lines of the MS224 system. The adaptor also supports
many EURO-ISDN facilities for Basic Rate Access.
The function of IA12 ISDN Adaptor is to support the ISDN BRA protocol of the
network in order to make bi-directional conversions between the ISDN BRA lines of
PTT and the analog lines of the MS224 system.
At basic capacity, IA12 ISDN Adaptor is capable of handling one S0 line coming
from NT1 of the PTT. This capacity can be further increased by means of an EXP-
IA12 Expansion Board which can also support one S0 line. Since each S0 line
offers two separate channels, the IA12 alone can convert two analog lines of the
MS224 system to one ISDN BRA-S0 line whereas the IA12 with EXP-IA12 can
convert four analog lines to two ISDN BRA-S0 lines.
The IA12 ISDN Adaptor communicates with the MS224 system through the data
line of KAREL telephones. Due to the current limitation on this data line which also
feeds the adaptor, it is not possible to connect more than three adaptors to the
Summary of Contents for MS224
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