• Easily connect older (existing) Intercoms to an analogue subscriber port of a modern telephone system
• Implementation of 2-wire interface (FTZ 123 D 12-0) and 4-wire interface on a / b
• Additional switching possibilities for z. B . second bell or lighting with optional Auerswald a / b switch modules
• power supply via bell transformer
• Separate volume control for both speech channels, impedance adjustable
• Integrated power amplifier for microphone without amplifier
item: 1 ST.