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C .
SOPHO-LAM CONVERTOR
The SOPHO-LAM P375 convertor can be used instead of the MLU convertor. This appendix
describes the details of the SOPHO-LAM convertor configuration. Chapter 3 contains the
general information.
C.1.
DTE-MODE
When the SOPHO-LAM P375 (release 3) is used in a convertor configuration it has to operate
in `DTE mode'. In this mode the V.24 interface of the SOPHO-LAM operates as a DTE, so a
DCE (modem) can be connected. However, the interace does NOT exactly operate
according to the V.24 recommendations. Therefore a special cable has to be used between
the SOPHO-LAM and the convertor modem (see section
SOPHO-LAM AND
MODEM).
The SOPHO-LAM is set in the DTE-mode using special sub-signalling groups. These
subsignalling groups are:
-
for a DLC-A/B/C and D
-
for a DTX-I, DLC-I and DLC-U: 0910.
The basic functions of the SOPHO-LAM operating in DTE mode can be divided in three parts:
basic functions during an incoming call, during an outgoing call and during idle state.
Note: active signal = ON-state of V.24 circuit;
deactive signal = OFF-state of V.24 circuit.
• Incoming call
When the modem detects an incoming call it activates CT125. This circuit is connected to
CT141 of the SOPHO-LAM.
The SOPHO-LAM detects an active signal at CT141 and in return activates CT107.
CT107 is active as long as the call exists. When the call is cleared, the SOPHO-LAM
deactivates CT107.
CT107 is connected to CT108 of the modem.
Now the modem detects an active signal at CT108 and in return activates CT107. This
circuit is connected to CT108 of the SOPHO-LAM (the call is answered by the modem).
• Outgoing call
C.2. V.24 CABLE BETWEEN
: 280C;
93
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