Device properties, interface for connecting external and internal stations to PBXs via analog port, number of PBX interfaces: max. 64 in a TCS:BUS system, phone number memory with max. 16-digit phone number, connection via standard telephone connection, LED displays for operating modes / transmission status, error display, number of wires: 3-wire required, mounting type: top hat rail mounting, housing type: series installation housing (6 HP), configuration: via DTMF (tone dialing) / configo, extended properties, door intercom to external stations with (mobile) phone, internal calls to indoor stations with (mobile) phone, triggering of actuators with (mobile) phone, relay switching time: adjustable, day/night switching, call forwarding, technical data, technology: 3-wire TCS:BUS, supply voltage: 26 V, input current: max. 50 mA, series installation housing HxWxD mm: 90x105x70, permissible ambient temperature: 0 to +40 degrees C, Note, FBO1110 and FBO1210 must NOT be combined in a TCS system