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C H A P T E R
2
I N S T A L L A T I O N
The following diagram shows how the circuits are presented. By default, the jumper links are set in the
factory for Type V operation (shown below):
Schematic 'E' circuit
Schematic 'M' circuit
4K7
E
M
JP2
1K2
JP3
JP4
EREF
MREF
JP6
JP5
0V
-48V
The E&M signalling return paths must be connected externally. This can be accomplished by connecting
the EREF lead to the PABX frame ground with a good cable.
The current detector in the 'M' circuit has an internal impedance of 4K7 and by default is referenced to –
48V. It can therefore be stimulated by keying the 'M'lead to ground.
The output signal is provided as a contact closure between the 'E'lead and the 'EREF'lead. The active state
may be a break or a make, selected by JP4. JP2 and JP3 allow the selection of closure impedance and
filtering, whilst JP5 selects the 'EREF'lead voltage reference. If the reference is set to 0V, the contact
closure keys the signal connected on the 'E'lead to chassis ground via the selected impedance.
V100 Versatile Multiplexer Technical Manual Version 2.2
Page 23 of 231
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