8
A100K10873
VSP 12-Way Batteryless Telephone System
Technical Manual
3 Installation
In a VSP system, one station MUST BE a VSP-211-L where the
transistorized amplifier is located. This amplifier is used by all stations.
The other stations in the system can be any other VSP station type,
depending on the requirements and environments.
3.1 Connection
All stations in a VSP system are connected in parallel, i.e. all terminals
with the same number are linked together in all stations.
Some stations have additional terminals for station type related
connections.
All VSP stations
General screw terminal block numbered from 1 to 16.
Microphone line
1 (signal) and 2 (ground)
Speaker line
3 and 4 (balanced)
Station lines
5 to 16 (lines 1 to 12)
VSP-223-L station
This station has a built-in latch relay circuit for activating external
audible and/or visible signal units. Additional terminals 17-22 are added
for this feature.
Local 24 VDC for signal unit
17 (+24 V) and 20 (0 V)
Signal unit connection
18 (+24 V) and 19 (0 V)
Alarm stop button
21 and 22
VSP-211-L station
The VSP system can also work as a common battery telephone system
when an external 24 VDC power supply is connected to the system
amplifier. Two terminals are added for this purpose.
External power in
23 (+24 V) and 24 (0 V)
3.2 Cabling
The recommended cable is 0.5 sq. mm revolved in pairs with an outer
insulated screen, like RCOP.
The number of wires needed depends on the number of stations in the
system.
● Two twisted pairs are used as microphone (1 pair, terminals 1 &
2) and speaker (1 pair, terminals 3 & 4) lines. In addition, one wire
is used for each station selection. A full system with 12 stations
therefore requires 8 pairs of wires.
●
The screen must be connected to terminal 2 in VSP-211-L to avoid
noise problems.
