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route behaves like a route without DDI. A connection set-up to an operator (not very
useful if digital information is directly sent over the trunk line) or permanent line extension
(DTE) is possible.
This configuration implies that the MLU must be treated quite differently now because the
analogue interface of the MLU, which is normally connected to the Modem, is not used any
more. Now the MLU must be defined as a kind of ATU with a maximum of four trunk lines.
The following specifications apply for a MLU in leased line configuration:
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The MLU has to be projected with board type 22; signalling group 16XX; HW-type 255.
The signalling group depends on the data speed and the direction of the call set-up.
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The circuits on the MLU are assigned a line number. This line is related to a bundle and
the bundle to a route. This route is related to a destination which can be reached using a
normal trunk access code. For more information on the line and routes: see Facility
Implementation Manual; Networking and Routing.
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The outgoing route option Direct Switch Through must be set to true. The ISPBX does
not wait for an answer signal over the `trunk line' but switches the trunk line directly to
the destination party.
For more information on the MLU and leased lines: see Appendix B.
Leased Line Configuration with SOPHO-LAM P375
A SOPHO-LAM P375 convertor configuration can be used instead of an MLU. The
configuration for such a leased line connection is shown in figure
to an Analogue Trunk with SOPHO-LAM Convertor (Leased Line).
30
Figure 3-4 Digital Connection
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