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Called party
0
Calling party
0
3
CV-A
1
3
2
2
3
0
4
0
Figure A-1 CV Connection Allowance Table.
A.4.
CONVERTORS (MODEMS)
• ISPBX Determines Convertor Type Used
ISPBX determines which type of convertor (modem) must be inserted in the data path.
The system manager must define the convertor types and which type must be used in a
certain data call.
Connection Allowance.
The internal DTE has a CV assigned to its DNR. The involved route also has a CV assigned
to it. If the connection between the internal DTE and the route is only allowed when a
modem is used then the CV connection allowance 2 is used, `allowed with convertor'.
ISPBX knows that a modem has to be switched into the connection (between the DLC
and the ATU).
Convertor Type.
The convertor type is determined by a table corresponding to the CV connection
allowances. This table is defined by the system manager with the OM-command ASCVCT.
This is a table indicating which convertor type must be used when CV-A is to be connected
with CV-B. If the connection is to be set-up in both directions then the command must be
used twice, once for outgoing data calls and once for incoming data calls.
For example: the CV-CV convertor type table is defined as follows:
CV-B
1
2
3
4
3
2
0
0
3
0
0
3
0
3
0
2
0
0
3
3
3
2
3
3
Digits inside the array:
0 = Not Possible
1 = Not Allowed
2 = Convertor Required
3 = Allowed
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