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data connection is present. The DTEs can send any type of digital information.
To make the data call with an external DTE possible the following conditions must be fulfilled:
-
The modems must be compatible with each other.
-
The trunk access code must be included in the applicable dialling tree for the DNR for
outgoing calls
and/or
the DNR must be included in the applicable dialling tree for the incoming traffic over the
route (or assisted).
-
The traffic class of the DNR must be sufficient to dial the trunk access code
and/or
the traffic class of the incoming route must be sufficient to dial the DNR.
-
The CV-DNR to CV-trunk line connection allowance must be set to allowed (both ways).
CVs are allocated to routes, all lines in the route have the same CV.
-
The external number must be included in the DDO-tree.
-
The traffic class of the DNR must be sufficient to dial the external number.
Note: The last two conditions can be avoided for outgoing calls if the route option `direct switch
through' is true. No number analysis is performed on the external number any more. After
the trunk access code the speech path between the calling party and the trunk is
established. The dialled digits for the external number are not regenerated by the ISPBX
any more. The user can only dial an external number with keytones. The keytone
information is directly transferred over the speech path to the opposite exchange.
3.1.2. Data Terminal Connected to a DLC/DTX (CONVERTORS)
A modem is required when a DTE is connected via a SOPHO-SET, SOPHO-LAM or LAM to
a DLC/DTX, and a connection has to be made over an analogue trunk or tie-line. In this
situation the signal from the DTE has to be modulated by a modem so it can be transferred
over an analogue line. This modem interconnection is used in the following two configurations
(see figure
Figure 3-2 Leased Line and Switched Line
-
the leased Line configuration;
-
the switched line configuration.
configuration.):
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