For connecting door intercom systems with TwinBus technology to PBXs with FTZ 123 D12 interface. Analogue or ISDN PBX. Connection of a TwinBus door station to a PBX. Connection to FTZ 123 D 12. Installation in standard distributor or surface-mounted. Power supply via TwinBus cable. For installation on top hat rails in standard distributors in accordance with DIN EN 43870. Dimensions: 70x90x60 mm (WxHxD). Machine positions: 4. Power supply: from TwinBus cable. : REG.