Connection Four-Wire - ASCOM Ascotel 2025 System Manual

ascom Ascotel 2025/2045/2065
7.5.5.3

Connection Four-wire

1. Fit jumper TFE1 and TFE2 for door intercom interface 1 and 2 in position 4D.
2. If the door intercom interface is DC-free and has a high input impedance
( ³ 600 W) , connect the output path (in the loudspeaker direction) to Ta and
signal ground SGND.
3. If the door intercom interface is not DC-free and if it has a low input imped-
ance (< 600 W) , connect the output path (in the loudspeaker direction) to LS
and signal ground SGND. In this case power the interface at the AC and AC'
connections via an external bell-ringing transformer with 8...12 VAC and set
the volume control to minimum.
4. Connect the microphone to MIC and signal ground SGND, using a screened
cable if necessary.
5. Connect the switches for telephone hands-free device to TS and TS'.
6. Connect the door opener to TO and TO'.
4.98 Cabling Interfaces HBT_20321104_04/B0_en