The IEDA528EAO is installed on a 528 series microphone station to provide a single analog output at the station’s location. This board can be configured to provide one of two functions. It can provide an analog output of a CobraNet® channel using the host 528 station’s Ethernet capability. This function is ideal for feeding analog audio to a local monitor loudspeaker that is used as part of the system’s supervision function as is the case of the IEDA528SRME-H microphone station. The second use of the board is to provide a direct analog output of the microphone that allows it to function in an emergency backup mode. If the network connection to the announcement controller is lost, then the microphone will route audio to the analog output that can then be used with a local power amplifier for emergency paging.