Main functions of highway tunnel emergency telephone extension

1. Emergency phone users can communicate directly with the operator of the emergency phone console and talk by key (easy to operate).

2. After the user presses the extension button, the extension can automatically call the console host of the monitoring center and transmit basic information such as the local kilometer number, uplink and downlink direction.

3. Each emergency phone has a unique address code for uploading to the control center to determine the call location and receive calls and detection.

4. After the console attendant answers, a full-duplex call can be established in time.

5. The console can talk to any two emergency phone extensions at the same time.

6. It can accept the detection command issued by the console host, check the extension in time and send the detection results to the console host.

7. If any one or more emergency phones fail or are damaged, it should not affect the calls between other emergency phones and the console.

8. The extension can automatically issue a voice prompt when calling to report the system working status.

9. It can accept various calls from the console host and automatically release the circuit after the console hangs up.

10. The voice is clear and loud during the call, without feedback howling.

11. When the extension is damaged (for example, the door is illegally opened) or the battery is undervoltage, the line fails, etc., the extension can automatically send an alarm message to the console host.

12. It can automatically enter the call and standby working state to reduce power consumption.

13. It is powered by solar energy, which is energy-saving and environmentally friendly.

14. The extension has taken a variety of lightning protection measures and has a good lightning protection effect.

15. Broadcast amplifier communication, the broadcast amplifier can be turned on and off, and audio signals can be output to the broadcast amplifier.

16. The extension is equipped with high-strength imported reflective film luminous signs in the direction of welcoming and sending cars. The logo pattern and color meet national standards.

17. The main circuits inside the system control host are designed with a "hot standby" structure. The main circuit works when the system is normal, and the standby circuit automatically works when the main circuit fails. Using the standby circuit, the system can provide 2 connection channels at the same time to ensure that the console can talk to 2 different roadside extensions at the same time.

18. The system is equipped with lightning protection. The inlet and outlet ports of the host, extension system and each amplification load area must be connected to lightning protection terminals to prevent the surge caused by lightning induction from damaging the host, extension and each amplifier.