Changjun High School, a provincial-level model senior high school in Hunan Province, was founded in 1904 by Yan Zhongji, the then-prefect of Changsha. Originally named Changsha Prefectural Middle School, it was the only government-established secondary school in Changsha at the time and a pioneer of modern education in the region.
Throughout its long history, the school has undergone several name changes and was officially restored as Changjun High School in 1984. Today, it stands as one of the most prestigious secondary schools in Hunan, recognized for academic excellence and its responsibility in hosting national-level standardized examinations.
As a key examination center in Hunan Province, Changjun High School conducts a large number of national and provincial examinations each year in addition to daily teaching activities.
However, the legacy clock system across classrooms and examination rooms suffered from time drift, inconsistent calibration, and manual maintenance, which posed risks to examination fairness and operational efficiency.
After extensive evaluation, the school selected Shutai Synchronized Clock Systems to deploy a master–slave clock (parent–child) architecture, comprehensively upgrading its campus-wide time management infrastructure.
High-Precision Time Synchronization
All examination room clocks must achieve millisecond-level synchronization to eliminate time discrepancies and potential disputes.
High System Reliability
Stable operation under adverse weather conditions or signal interference, ensuring uninterrupted performance during critical examinations.
Ease of Maintenance and Scalability
Intuitive management interface with remote monitoring capabilities and support for future expansion of examination rooms.
Clear Visibility
Clock size and display design suitable for various classroom layouts, ensuring clear readability even from the back rows.
Shutai delivered a GPS/BeiDou dual-mode master–slave clock system, customized to meet the school’s examination standards.
The master clock receives time signals from GPS and BeiDou satellites, achieving nanosecond-level accuracy, and distributes standard time to all slave clocks via a fiber-optic network, enabling millisecond-level synchronization campus-wide.
Failover Mechanism: In case of satellite signal obstruction, the system automatically switches to an internal rubidium atomic clock or NTP network time source, ensuring continuous and reliable time output.
A centralized monitoring system provides real-time visibility into the status of all examination room clocks and triggers automatic alarms for anomalies such as signal loss or device faults.
Seamless integration with the school’s examination management system enables automated time calibration and exam session scheduling.
Slave clocks feature high-definition LED displays (220 × 480 × 50 mm) with adaptive brightness to prevent glare and ensure optimal readability in different lighting conditions.
Installation locations were scientifically planned to avoid electromagnetic interference from routers and high-power equipment, guaranteeing stable signal transmission.
Enhanced Examination Fairness
All 30 examination rooms achieved zero time deviation, completely eliminating disputes caused by time discrepancies.
Significant Improvement in Operational Efficiency
Administrators can recalibrate all campus clocks within 10 minutes via the remote platform, reducing maintenance costs by 40%.
Digital Transformation of Teaching Management
The system integrates seamlessly with the campus IoT infrastructure, laying a solid foundation for smart campus development.
Strengthened Public Recognition
The project was recognized by the Hunan Provincial Department of Education as a “Model Case for Standardized Examination Centers”, attracting visits and benchmarking from peer institutions.
“The Shutai master–slave clock system has not only resolved our long-standing time management challenges but has also earned unanimous recognition from both teachers and students for its reliability and intelligence. Its zero-failure performance during examinations truly demonstrates Shutai’s professional expertise.”
Shutai Electronics is a professional time and frequency technology company with over 14 years of experience, specializing in satellite-based time synchronization solutions. Its products and systems are widely deployed across education, healthcare, transportation, enterprises, and government institutions, providing authoritative time and frequency standards nationwide.
Shutai synchronized clock systems have become a preferred choice in China, delivering precise, reliable, and scalable time services for mission-critical environments.
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