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V.24
2B+D
DCE
DTE-A
TA-A
DCE-SOPHO-SET,
SOPHO-LAM or LAM
DTE-B
1
2B+D,( B=64kbps, user channel.
2
SOPHO-LAM P375 release 3 in DTE mode (!)
3
Special cable (See appendix C)
4
Modulated carrier.
TA = Terminal Adapter
Figure C-2 Leased Line Configuration with SOPHO-LAM convertor.
The convertor modem (MODEM-A) has to be configured as follows:
-
Leased line configuration;
-
CT108 always ON (Hayes command AT&DO);
-
CT107 indicates the clearing of the analogue connection (according to the V.24
specification, Hayes command AT&S1);
-
Automatic answering ON (Hayes command ATS0=1);
-
modem operates in silent mode (result codes disabled, Hayes command ATQ1);
-
CT109 is ON when the analogue connection is present (according to the V.24
specification).
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.
In the following sub-sections the operation of the SOPHO-LAM convertor configuration is
described without dialling protocol information. So, the required V.25bis, Hayes and keyboard
dialling commands are not described. For a detailed description of these commands, refer to
1
SN
IMP
64 kbps
DLC/
DTX-I
MODEM
V.24
4
MODEM - B
1
IMP
64 kbps
2B+D
DLC/
SOPHO-
DTX
MODEM - A
PSTN
Leased line
2
3
V.24
LAM
TA-B
MODEM
4
99
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