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remote modem is connected to the V.24 interface of the SOPHO-LAM convertor. Then
the calling party has to specify the destination DNR using one of the dialling methods
offered by the SOPHO-LAM.
The following specifications apply for a SOPHO-LAM switched line configuration:
-
It is not allowed to define a convertor pool which is a mixture of MLU convertors and
SOPHO-LAM convertors;
-
A convertor pool may be located anywhere in the Fully Integrated Network;
-
Each convertor type has its own programmable data rate adaption method; Philips
Proprietary, X.30 or V.110. When different data rate adaption methods are required then
different convertor types have to be installed, or one SOPHO-LAM with different profiles;
-
There is NO logical relation between the DLC/DTX and the ALC of the convertor. For
example a status change of one of the circuits (four example as a result of SETOUT) does
not result in a status change of the other related circuit;
-
When the analogue party at the other side of the trunk or tie line clears the call, then the
internal digital party is informed about this via the convertor;
-
When the internal digital party clears the call, then the analogue party at the other side of
the trunk or tie line is informed about this via the convertor;
-
The modem must be able to handle the destination information from the calling party. For
example Hayes or V.25 bis.
-
During the convertor interconnection the ISPBX checks the IBSC/BSPT compatibility and
the CV compatibility. When a convertor is selected then the call is proceeded with the
service characteristics of the convertor output circuit. For example when a call is made via
a DPNSS trunk, then the Service Identification Code (SIC) sent to the other party is
derived from the projected IBSC of the convertor output circuit;
Use the following procedure for projecting a SOPHO-LAM convertor for switched lines
(please refer to the OM command manual for detailed information):
-
Use the SOPHO-LAM P375 release 3 or upwards;
-
Use PPU package 144.4 or upwards;
-
Assign a DLC/DTX board using OM command ASBRDS and the correct sub-signalling
groups (ASPCTB) to operate the SOPHO-LAM in DTE mode (see Appendix C);
-
Assign a ALC board using OM command ASBRDS:
-
Assign an ATU board using OM command ASBRDS;
-
Set the boards and circuits in service condition INS using OM command SETINS;
-
Assign DNRs to the line circuits of the DLC/DTX to which the convertors are connected
using OM command CHDNRC;
-
Assign DNRs to the line circuits of the ALC to which the convertors are connected using
OM command CHDNRC;
-
Assign IBSC `64 kbit/s unrestricted' (IBSC=0) to the DNRs of the DLC/DTX using OM
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