IED designs and manufactures audio and visual paging and public address systems that are used in airports, transportation systems, and other large public facilities. IED’s 500ACS Airport Communication System is the first paging system that runs on Ethernet directly from the microphone station to the power amplifier. The digital 500ACS utilizes the IED 528 Digital Communication Station, which provides a 4” color LCD screen and programmable soft keys to give airport users a powerful microphone paging control station that connects over one simple Ethernet port.Recent IED airport installations include: Miami, Frankfurt Germany, SeaTac, and Reno.