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individual convertors, compatibility values can be used. It is also possible to use modems of
which the settings can be protected with a password.
The convertor modem has to be configured as follows:
-
Leased line configuration;
-
CT108 always ON;
-
CT107 indicates the state of the analogue connection (according to V.24);
-
Automatic answering ON;
-
modem operates in silent mode (result codes disabled).
With this configuration there is a permanent connection between the modems as long as the
remote terminal is operational. So, the connection is only cleared when the remote terminal
is switched off.
Call progress is as follows:
• Outgoing call
When the calling party dials the converter group DNR, one of the convertors is selected
and a connection is made between the calling terminal and the corresponding SOPHO-
LAM. Because the connection between the modems is already present, the calling
terminal is directly connected to the remote terminal.
• Incoming call
When the remote terminal is switched on, the remote modem sets up a connection to the
convertor modem. After the connection between the modems is established, the remote
terminal is connected to the SOPHO-LAM. The remote terminal can initiate a call request
by typing a character (CT103 as call request). After the call request the SOPHO-LAM sets
up the connection to a fixed destination using PDD or hotline calling.
The following specifications apply for a SOPHO-LAM leased 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.
Use the following procedure for projecting a SOPHO-LAM convertor for leased 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;
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