1、brief introduction
The outdoor telephone is a durable communication device designed specifically for public areas such as campuses. The outdoor telephone features a high-strength metal casing and is waterproof, rust proof, and explosion-proof, allowing for long-term stable operation in outdoor environments. Users can make calls by inserting prepaid IC cards or SIM cards, without relying on fixed telephone lines or complex network deployments. In campus settings, the outdoor telephone is often installed in dormitory areas, teaching buildings, playgrounds, school entrances, and other places to provide convenient emergency communication and daily communication services for teachers and students, especially suitable for campus environments where mobile phone signal coverage is insufficient or students have limited access to mobile phones.
2、Working principle
(1)Card insertion and authentication
After inserting a campus specific IC card (such as a campus one card) or a regular SIM card, the outdoor telephone automatically reads the card information and completes authentication with the operator or campus intranet to confirm call permissions and tariffs.
(2)Signal transmission and communication
The built-in communication module (supporting 4G mobile network) converts voice signals into digital signals and transmits them to the target number through base stations or campus private networks.
(3)Billing and Deduction
The call charges are deducted in real-time from the balance of the IC card or the prepaid call charges on the SIM card; Some customized models on campus support linkage with the campus management system to achieve functions such as traceable call records and discounted tariffs.
(4)Environmental adaptability design
The iron shell is equipped with lightning protection and electromagnetic interference prevention modules, as well as high-sensitivity microphones and noise cancelling speakers, ensuring clear communication in rainy, low-temperature, or noisy environments.
3、Product application scenarios
(1)Dormitory area and teaching area
Students can contact their parents through the outdoor telephone or quickly contact the school security office or logistics department in case of emergencies (such as sudden illness or theft).
(2)Playground and Sports Center
During large-scale events, teachers and students can communicate instantly inside and outside the venue without carrying mobile phones, avoiding the problem of loss of contact caused by inconvenient storage of mobile phones.
(3)School entrance and surrounding walls
Visitors or parents who do not carry mobile phones can directly contact campus personnel through the outdoor telephone, improving the security and efficiency of campus access management.
(4)Remote campus or experimental base
In areas with weak mobile phone signals, such as mountainous campuses and outdoor internship bases, the outdoor telephone provides stable backup communication support.
4、Advantage
(1)Super durability
The all metal iron shell design is resistant to smashing, prying, and corrosion, and can withstand extreme weather conditions (-10 ℃ to 50 ℃) and human damage, making it suitable for high pedestrian flow environments on campus.
(2)Security and Privacy Protection
Call records can be traced to avoid anonymous harassment.
(3)Low maintenance cost
No wiring required, simple installation; Low failure rate, requiring only cleaning and regular inspections on a daily basis, suitable for unified management of school logistics.
(4)Flexible tariff model
Support campus customized IC cards (such as integrated with meal cards and access cards), convenient for students to recharge, and the school can set call time slots or tariff subsidy policies.
5、 Conclusion
the outdoor telephone on campus has become an important component of modern campus infrastructure due to its durability, safety, and low-cost operation characteristics. The outdoor telephone not only solves the communication needs in specific scenarios, but also integrates with smart campus systems (such as linked alarms and data statistics), further optimizing campus security management and service quality. In today's era of widespread use of mobile phones, these devices still safeguard the convenience and safety of campuses with their irreplaceable functional value.