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automatic convertor interconnection by Predefined Destination Dialling (PDD);
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automatic convertor interconnection by hotline;
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convertor pool selection by group DNR;
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individual convertor selection.
Automatic convertor interconnection by PDD is used for incoming leased line calls. The
predefined destination is a fixed internal destination DNR stored in the LAM convertor. When
the LAM convertor detects an incoming call (for example an incoming carrier), it automatically
dials the DNR which is stored in it's memory. Please refer to the user manual of the SOPHO-
LAM P375 for programming the LAM.
PDD acts almost the same as DDI. With DDI the destination information is the incoming dial
information, while PDD uses the programmed dial information in the SOPHO-LAM.
Automatic convertor interconnection by hotline is used for incoming leased line calls. The
fixed relation between the trunk line and the internal destination is defined by projecting a
hotline using OM command CHHOTL. The originator DNR is the DNR of the SOPHO-LAM
convertor.
Note that it is not always necessary to use a fixed destination for incoming leased line calls;
when the SOPHO-LAM is programmed for keyboard dialling, the external calling party can dial
a destination DNR. In this situation the calling party uses the keyboard dialling protocol of the
SOPHO-LAM to dial the destination. So, when the convertor modem detects an incoming call
(for example an incoming carrier), it initiates a call request to the SOPHO-LAM. After the call
request and after the connection between the modems is established, the SOPHO-LAM waits
for dial information. The calling party sends the destination DNR using it's keyboard, after
which the SOPHO-LAM sets up the connection.
Convertor pool selection by group DNR is used to access a pool of convertors. The group
represents a convertor pool. When an internal party dials a group DNR it will be connected
to one of the convertors out of the pool. After dialling the group DNR, in case of a leased line
connection, the calling party is automatically connected to the destination. So, no destination
information is required. All convertors must have the same destination. Otherwise the calling
party does not know to which destination the data call is made.
Individual convertor selection is used to access one single convertor. This way of selection is
especially for maintenance actions, such as changing the settings of the modem.
Normally only the maintenance engineer is allowed to use individual convertor selection. A
user should use convertor pool selection by group DNR.
A single convertor is selected by dialling the convertor DNR. Individual convertor selection is
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