UNITY DAU Installation & Maintenance Manual
Page Input
The paging input is an unmonitored input, at line level and the PTT line is connected to 5V to operate.
Once operated paging will mute the music input, once paging is complete the music will return gently.
The Ptt line goes to 5V when either the Fireman’s microphone or message generators are in use, the
Unity desk microphone uses this signal to light the busy LED on the microphone.
The Unity UNDM1 provides a complete solution to paging applications, and contains a chime generator,
microphone pre-amplifier and signal limiter to prevent clipping of the DAU and corrects for poor
microphone technique. The UNDM1 provides busy indication and first come first served logic for
cascading microphones.
Unity Microphone connections:-
Using 3
rd
Party Microphones.
Third party microphones can be used with Unity as long as they can provide a volt free Ptt contact, and
a balanced line level (0dBV) audio output. A 24V 100mA feed is available on the page connector to
provide power to an external microphone pre-amplifier to boost signals from microphone to line level.
Note: the Unity DAU does not contain a chime generator, and the microphone used must provide
this if required.
The level of the paging microphone can be independently adjusted using the front panel recessed
control marked “PAGE”
Document DCC UND 7001-01 Rev 1 June 2005
Page 15 of 17
