Purpose :
The Addressable Talkback Speaker is an emergency two-way communication device designed for signaling, speaking, and listening between remotely located occupants and the fire command station during emergencies. It enables quick and clear interaction, enhancing occupant safety and facilitating communication in fire or emergency situations.

Primary Functional Feature :

Signaling:
The device shall include a call push button to signal the fire command station, indicating the location of the caller at the control panel.

Speaking :
The device shall feature a highly sensitive built-in microphone capable of picking up clear audio from a distance of up to 40 centimeters. The audio captured shall be intelligible to the listener at the remote control panel.

Listening :
The device shall incorporate a built-in speaker that plays back audio from the fire command station. The speaker output shall range from 50 to 65 decibels at a distance of 50 centimeters from the unit.
Note : The talkback speaker’s volume is preset to 65 decibels at system commissioning. No further volume adjustments shall be allowed. Any volume control at the control panel will be disabled to ensure consistent audio output levels across the system, regardless of distance from the control panel.

Primary Indications :
The Talkback Speaker shall provide visual indications for the following modes:

Active Mode :
The unit shall blink every 5-10 seconds or remain steadily lit to indicate that it is in active mode and operational.

Activated Mode :
When the unit is called or signaled, and until the fire command station acknowledges the call, the Talkback Speaker’s LED shall glow to indicate the unit is activated and awaiting acknowledgement.

Talk Mode :
When the fire command station acknowledges the call, the LED shall glow to indicate the unit is in talk mode and two-way communication is established.

Note :
If a single LED is used to indicate all three modes, the device shall include clear visual differentiation for each mode.

Primary Control

Call Push Button :
The Talkback Speaker shall have a push button for initiating a call to the fire command station, signaling an emergency and providing the caller’s location.

Press-to-Talk Button :
A push button shall be provided to enable two-way communication by activating the built-in microphone.

Note :
If a single push button switch is used for both functions, the first momentary press will initiate the call signal, and the same button will switch to “Press-to-Talk” mode after the call is acknowledged.

Reset Function :
Once the communication has concluded, the Talkback Speaker shall accept an off signal to return to its normal standby mode.

Fault monitoring of device :
The Talkback Speaker shall include self-diagnosing features to monitor the health of the device and its connectivity. In case of any failure or disconnection, the control panel shall provide an audio-visual alarm indicating the device ID and its location.

Cabling Fault Monitoring :
The cabling used for signaling and powering the Talkback Speakers shall be monitored for faults, including damage that may interrupt the connection between the speaker and the control panel.

Over-Current Protection :
To protect against potential overcurrent situations caused by short circuits or faulty devices, overcurrent detection and automatic isolation shall be implemented at strategic locations within the circuit.

Powering the Talkback Devices

Two-Core Cable :
When the Talkback Speaker operates on a two-core cable for both signaling and powering, an overcurrent/short circuit detector and isolator shall be placed in the cabling circuit to ensure safe operation.

Separate Power and Signal Cables :
If the power and signaling cables are separate, each functional conductor shall be individually monitored for faults and failures.