C H A P T E R 2 I N S T A L L A T I O N
V100 Versatile Multiplexer Technical Manual Version 2.2
Page 21 of 231
The Factory Default Jumper Settings are shown in bold italics:
Jumper Description
1-2
2-3
JP1,7,13,19
FXO Loop current limit All other countries
France/TBR21
JP2,8,14,20
'E' lead impedance
1200ohms
Fused
JP3,9,15,21
1u0 'E' lead filter
Not fitted
Fitted
JP4,10,16,22
'E' lead keying
Normally open
Normally closed
JP5,11,17,23
'E' lead reference
-48V
0V
JP6,12,18,24
'M' lead reference
0V
-48V
Jumpers 1-6 relate to channel 1, jumpers 7-12 to channel 2 and so on. In all of the following discussions,
references to Jumper 1 are equally applicable to Jumpers 7, 13 and 19 of the other channels.
Jumper 1 allows the current limit in FXO mode to be set to conform to the French TBR21 requirement of
60mA.
Jumper 2 selects the impedance of the output contact closure presented by the ‘E’lead. The default setting
is for 1200ohms between ‘E’ and ‘EREF’, the alternative is a 0ohms connection with a 63mA fuse.
Jumper 3 allows a 1u0 capacitor filter to be connected from ‘E’ to ‘EREF’.
Jumper 4 selects normally-open or normally-closed ‘E’lead contacts.
Jumper 5 selects the polarity of the ‘E’lead reference provided by the system, relative to chassis ground.
Jumper 6 selects the polarity to which the ‘M’lead detector is referenced. In order to register a signal, the
‘M’lead must be keyed to an external signal 48V more positive than the reference.
The operation of the voice ports is controlled by the choice of "Interface" on the configuration screen.
2.4.1.1
FXS mode
In this mode the V100 is connected to a circuit which requires a ringing voltage (a Subscriber port). This
may be a telephone or a PABX trunk port, which operates on 2-wire circuits. For UK users, a British
Telecommunications Master Socket must be connected to the port in order to ring standard UK
telephones, since no ring capacitor is included in the interface. Interfaces to subscriber telephones of other
countries usually require only the 2-wire connection and equipment may therefore be wired directly to the
V100, since the telephones have an integral ringing capacitor.
FXS mode has two functions:
To convert a loop-to-ground signal from the remote unit into a ring voltage on the TIP and RING wires.
The ring signal consists of a 75Vrms voltage with a frequency of approximately 25Hz, which is modulated
with a standard UK cadence of 600mS ON, 400mS OFF, 600mS ON, 2400mS OFF. The standard cadences
of other countries are selectable.