AUDIO SOURCE UNIT WITH MOUNTING CHASSIS, MICROPHONE, PAGING CONTROLS AND FIREFIGHTERS TELEPHONE.
The Audio Source Unit with Firefighter's Telephone (ASU/FT) consists of the 3-ASU Audio Source Unit (ASU) and the 3-FTCU Firefighter's Telephone Control Unit (FTCU) mounted on a common chassis. The firefighter's telephone option in conjunction with the audio source unit provides the main telephone riser. The telephone circuit requires a separate hardwired riser and is not multiplexed over the network audio riser. The riser is supervised by the URSM. The ASU/FT requires one chassis space within an enclosure.