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You can set this operation using Hayes command AT&S1;
-
Connect the SOPHO-LAM to the modem with the special cable described in appendix C.
Switched Line Configuration with MLU
If the analogue trunk or tie-lines are to be used for both voice and data connections, then the
line cannot be directly connected to a modem. For this situation a number of modems are
installed as a common resource in a `modem pool'. When a DTE connected to a DLC/DTX
requires a trunk or tie-line, the ISPBX automatically accesses a free modem in the pool and
switches the modem into the connection. For this type of connection set-up a number of
requirements must be fulfilled for number analysis, traffic classes and compatibility values.
Except for the CV connection allowance check the same requirements must be fulfilled as for
the DTE connected via a modem to the ALC.
V.24
DCE-SOPHO-SET,
SOPHO-LAM or LAM
1
2B+D, B=64kbps, user channel.
2
Modulated carrier.
Figure 3-6 Digital Connection to an Analogue Trunk with MLU Convertor (Switched Line).
The modem has to be connected to a Modem Line Unit (MLU) (see figure
Connection to an Analogue Trunk with MLU Convertor (Switched
in a Unit Group of a PM. It can control a maximum of 4 modems. Each modem can be
connected between any analogue tie or trunk line and any digital line circuit via the MLU.
Modems of the same type are placed in a modem pool. When a modem is required ISPBX
looks for an available modem of the correct type in a particular modem pool. ISPBX
determines what kind of modem is required for the calling party. For example: synchronous
or asynchronous communication, speed, full or half duplex. How the correct modem type can
be determined, is discussed in appendix A.
Modems are defined within ISPBX as follows:
-
The MLU has to be projected with board type 33; signalling group 16XX; HW-type 255.
The signalling group depends on the data speed and the direction of the call set-up. The
36
1
IMP
2B+D
64 kbps
DLC/
DCE
DTX
SN
IMP
64 kbps
MLU
IMP
64 kbps
IMP
64 kbps
CV
ATU
MODEM
V.24
2
Analogue
Trunk
2
line
Figure 3-6 Digital
Line).). An MLU is a board
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