East Tennessee State University will test its emergency mass notification systems on Tuesday at 9 a.m. ETSUâs mass notification systems were installed in 2008, and include an outdoor warning siren system with five large speakers strategically placed on the main campus and on the VA campus. The system also features emergency text and email messaging, desktop messaging for computers connected to the ETSU system, an alert message on the ETSU homepage and a public address system in select university buildings. ETSUâs outdoor siren system will sound at 9 a.m. Once it begins, the alert messaging and the PA system will be activated.