IG1603 Fire Intercom Telephone System adopts 2-wire bus communication
technology, which consists of IG1603 fire emergency intercom control panel, IG3602 fire telephone extension, IG5902 fire telephone jack, IG3902
fire telephone extension, and external DC24V power supply, and the design is in line with the relevant requirements of the national standard GB16806-2006 "Fire Linkage Control System".