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MLU acts as the DTE in this configuration and controls the unattended modem (DCE). For
more information on the MLU and convertors: see Appendix B.
Modem pools are created as follows:
-
One MLU can handle different modem types; on one MLU, the modems can belong to
different modem pools; the modems belonging to one modem pool can be divided over
different MLUs.
-
In a modem pool all the modems must be of the same type. This is known as the
`convertor type'. The convertor type number is created with the command CRCTYP.
-
When the convertor type number of the modems in the modem pool has been defined,
the location of the modems in this pool must be told to the ISPBX. This is done by relating
a EHWA of a MLU circuit (where the same type of modem is connected) to a convertor
type number with the command ASCONV.
-
Now the system knows which types of convertors (convertor type numbers) are present
and where a convertor of a certain type can be found. Which type of modem must be
used, is determined in the `CV-A - CV-B - convertor type number' array. This array is
defined with the command ASCVCT. With this command the modem type that must be
used when a connection between an internal DTE and an analogue trunk line is defined.
-
In a FIN the number of modem pools (different modem types) is limited by the network
boundary NEBOUND 033 (max. size of convertor compatibility list).
-
Per unit the maximum number of MLU boards (each board has 4 circuits) is limited by the
boundary LOBOUND 054 (max. nbr. of modem line units).
Some display commands:
DICTYP
:
DICONV
:
DICVCT
:
The erase commands:
ERCONV
:
ERCTYP
:
Switched Line Configuration with SOPHO-LAM P375
A SOPHO-LAM P375 convertor configuration can be used instead of an MLU. The
configuration for such a switched line connection is shown in figure
Connection to an Analogue Trunk with SOPHO-LAM Convertor (Switched Line).
display the created convertor types
display relation convertor type -- convertor EHWA
display relation CV-A -- CV-B -- convertor type
erases convertor EHWA (circuit must be in NIN)
erases convertor type (all convertors must be deleted first)
Figure 3-7 Digital
37
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