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V.24
DCE
DTE-A
TA-A
DCE-SOPHO-SET,
SOPHO-LAM or LAM
V.24
DTE-B
MODEM - 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-3 Switched Line Configuration with SOPHO-LAM convertor.
As described in section
SOPHO-LAM convertor configuration for switched lines can NOT be used for both incoming
and outgoing calls (direction of call set-up). The reason for this is that both configurations use
different convertor settings.
The convertor modems in a pool for incoming calls should be configured as follows:
-
Switched line configuration;
-
silent mode (result codes disabled, Hayes command ATQ1);
-
Automatic answering ON (Hayes command ATS0=1);
-
CT107 indicates the state of the analogue connection (according to the V.24 specification,
Hayes command AT&S1);
-
when CT108 changes from ON to OFF the modem must go on hook (Hayes command
102
1
IMP
64 kbps
2B+D
DLC/
DTX-I
MODEM
4
PSTN
3.1.2. Data Terminal Connected to a DLC/DTX (CONVERTORS)
1
SN
IMP
64 kbps
2B+D
DLC/
DTX
IMP
64 kbps
ALC
IMP
64 kbps
ATU
Trunk line
2
3
V.24
SOPHO-
LAM
TA-B
MODEM
4
MODEM - A
the
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