Mitel PA-1 - audio interface adapter

The ShoreTel PA-1 Paging Adapter is an accessory for ShoreTel Voice Switches that is designed to help customers deliver a superior paging audio experience. It provides two distinct features that can improve the audio experience in many paging system deployments. The paging adapter contains an isolating transformer and converts the switch's unbalanced paging audio output to a balanced, floating audio output signal for input to the paging system. These elements substantially reduce the impact of power line frequency hum and ground loop noise on the paging system output. It also includes a solid-state, normally open contact closure relay output, which is useful for providing external keying to a paging system. The contact closure capability improves initiation of an audio page, especially for muting background music and in push-to-talk applications.