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X2.3 for the detection level for modem number 2;
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X2.4 for the detection level for modem number 3.
The board positions of the straps and the correct settings for the detection levels are given in
the Maintenance Manual.
A schematic overview of the MLU is given in figure
circuit with connected
modem acts as the DCE and the MLU as the DTE. The control of the board is performed by
a microprocessor. This control is common for all modem-circuits. This control guards the
status of the 4 modem-circuits on the board. The status changes of the modems are
transferred to the PPU and further on to the CPU via the CODI and CODO 2 Mbps lines, on
the back panel. The user information is transferred via the USI and USO 2 Mbps lines to the
PSC/PMC and further on to the switching network., The card uses the clock signal from the
back panel for timing purposes, to be able to access the correct position (timeslot) in the 2
Mbps lines USO/USI.
68
Modem., with one modem connected. For the V.24 interface the
Figure B-1 Schematic Overview of MLU
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