Bosch Security Systems | 2003-09 | 3922 988 99483en
Plena System Pre-amplifier | Installation and Operating Manual | en | 20
6.1 Controls & Connections (top)
Figure 6.3
1 Microphone
2 Zone selection keys with indication LED
3 All zone selection key with indication LED
4 Press to talk key with indication LED
5 Labels for zone indication.
The call stations LBB 1941 and LBB 1946 can be connected in a loop-through arrangement to the LBB 1925. Each
input of the LBB 1925 can have up to 4 call stations. The call station cable may be extended up to 500 m from the
LBB 1925, using shielded CAT-5 quality cable (four twisted pairs with one overall shield) and 8-pin DIN
connectors. One twisted pair for power supply connection (DIN pin 4: 24Vdc, pin 2: ground), one twisted pair for
data communication (DIN pin 6: data -, pin 7: data +), one twisted pair for audio (DIN pin 1 and pin 3) and one
twisted pair for all-call select (DIN pin 5) and connection to chassis ground (DIN pin 8).
Note
An editable label template (MS Word) can be downloaded from
www.boschsecuritysystems.com / www.philipscsi.com.
1 3 42
5
1 4
About the call stations
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