System overview   
1.40  EST3 Installation and Service Manual 
Note: 
The EST3 amplifiers operate in a stand-alone mode should 
they lose communication with the Audio Source Unit. The alarm 
tone used in the alarm message should be the same tone used by 
the amplifier for stand alone alarm signaling. 
Alert message format 
The basic alert message consists of an alert tone followed by an 
advisory message. The suggested alert tone should be easily 
differentiated from the alarm tone and can take the form of a 
constant tone, or a constant tone modulated at a 20 pulse per 
minute rate. Please refer to the Authority Having Jurisdiction for 
specific requirements. 
Typical Alert message text: 
  Female Voice: “May I have your attention please. May I 
have your attention Please.” Male Voice: “There has been an 
emergency reported in the building.” “Your area is in no 
immediate danger.” “People from other areas of the building 
may be entering your area.” “Be prepared to leave the 
building if you hear the evacuation signal.” “Repeat, you are 
in no immediate danger.” 
Informative messages 
Informative messages are those special purpose signals to areas 
of the facility which may have special concerns during an 
emergency situation. Typically these areas include elevator cabs, 
stairwells, and areas in less peril than those areas receiving the 
Alert signal. Some sample informative messages appear below. 
Elevator message text: 
  Female Voice: “May I have your attention please. May I 
have your attention Please.” Male Voice: “There has been an 
emergency reported in the building.” “The building manager 
has directed the elevators to the lobby.” “Please exit the 
building when you reach the lobby.” 
Stairwell message text: 
  Female Voice: “Please continue down the stairs to your 
assigned re-entry floor or the lobby.” “Do not attempt to use 
the elevators.” 
Do Not Enter message text: 
  Male Voice: Do not enter this area.” “This is not an exit.” 
“An emergency has been reported in this section of the 
building.” “Please exit the building using a marked fire exit.”