The 1009505000 is a FBSAR, filter board and speech adapter with relay. Analog interface board to Public Address (PA) system or to non-selective radio system. Includes relay for controlling the PA system or keying the radio transmitter. Two channels, the first channel supports both input and output signals and is suitable both as PA and mobile radio interface, second channel is output only and is suitable for PA interface. Connects to subscriber (ASLT) line. Galvanic separation between the audio server and the external equipment.