Connection Without Amplifier - ASCOM Ascotel 2025 System Manual

ascom Ascotel 2025/2045/2065
7.5.5.1

Connection without Amplifier

Connection of a simple loudspeaker microphone module or of a loudspeaker
(4...8 W ) and an electret microphone with integrated preamplifier:
1. Fit jumper TFE1 and TFE2 for door intercom interface 1 and 2 in position 4D.
2. The interface is powered at the AC and AC' connections via an external bell-
ringing transformer with 8...12 VAC.
3. When implementing an announcement system, make sure that
– a min. current of 0.6 A (at 12 V) is available for a sufficient output power
and
– that the no-load voltage of the bell-ringing transformer is < 16 VAC.
4. Connect the microphone to MIC and MIC+, using a screened cable if neces-
sary (observe the correct polarity).
5. If the full output power is to be used, use loudspeakers with a min. load-car-
rying capability of 3 W.
6. Connect the loudspeakers to LS and signal ground (SGND).
7. Connect the door intercom (wire-wire connection) to MIC, MIC+ and LS.
8. Set the loudspeaker volume on potentiometer Pot1 and Pot2.
9. Connect the switches for telephone hands-free device to TS and TS'.
10. Connect the door opener to TO and TO'.
4.96 Cabling Interfaces HBT_20321104_04/B0_en