As a core support for critical infrastructure, the time synchronization system’s continuity directly affects the stable operation of business systems. Sudden events such as satellite signal loss, equipment hardware failures, and network outages can all lead to interruptions in time synchronization services, resulting in serious consequences like business disruptions and data corruption. In response to the disaster recovery needs of time synchronization systems, Beijing Zhongxinchuang Technology Co., Ltd. has developed A full‑process disaster recovery and backup solution featuring multi‑level disaster tolerance, rapid failover, and intelligent monitoring ensures 24/7 uninterrupted time synchronization services.

• Core-level disaster recovery for time synchronization systems Based on the level of business criticality, disaster recovery and backup solutions are categorized into three tiers to meet the diverse needs of different industries:

1. Basic disaster recovery ( Level 1: Single-device + local timekeeping, suitable for small, medium, and micro enterprises as well as office environments. It leverages a built-in timekeeping module to maintain short-term timing accuracy when satellite signals are unavailable.
2. Intermediate disaster recovery ( Level 2: Dual‑machine hot standby with geographically distributed synchronization, suitable for industries such as finance and healthcare. Two devices operate in real-time synchronization; in the event of a failure, automatic failover occurs within ≤1 second.
3. Advanced disaster recovery ( Level 3: Cluster deployment with multi‑region backup, suitable for critical sectors such as government, energy, and transportation. Multiple devices are deployed across regions, supporting load balancing and automatic failover, with service availability of ≥99.999%.

• Core Design of the China–Singapore Innovative Disaster Recovery and Backup Solution  

• Basic Disaster Recovery Plan

1. Configuration: Single time server ( DNTS-9 series/PTP series) + high-precision timekeeping module (temperature-compensated crystal oscillator/rubidium atomic clock);
2. Disaster recovery mechanism: When satellite signals are lost, the system automatically switches to local timing mode, with timing accuracy varying depending on the module. 0.1 μs/h to 1 μs/h, supporting continuous timekeeping from several hours to several days;
3. Suitable scenarios: small office networks and non-core business systems—low cost and easy deployment.

• Intermediate Disaster Recovery Solution (Dual-Node Hot Standby)

1. Configuration: Two time servers (primary–standby mode) + shared storage + cluster management software;
2. Disaster Recovery Mechanism: - The primary and standby devices synchronize configurations and operational statuses in real time, with health monitoring performed via heartbeat detection at intervals of no more than 100 ms. - In the event of a primary‑device failure—such as hardware malfunction or network outage—the standby device automatically takes over services, with a seamless switchover that requires no reconfiguration on the client side. - Supports both manual and automatic failover modes to meet operational and maintenance requirements.
3. Suitable scenarios: bank branches, hospitals, and core business systems of medium-sized enterprises—offering high cost-effectiveness and robust reliability.

• Advanced Disaster Recovery Solution (Cluster Deployment)

1. Configuration: Three or more time servers (deployed across regions) + load balancing equipment + an intelligent monitoring platform;
2. Disaster Recovery Mechanism: - The system comprises a master clock, slave clocks, and a backup clock: the master clock provides time‑synchronization services; the slave clocks synchronize to the master clock and share the load of concurrent requests; the backup clock remains on standby. - In the event of a master‑clock failure, a slave clock automatically assumes the role of master, while the backup clock takes over to maintain synchronization, with a switchover time of ≤500 ms. - The system supports cross‑regional deployment—such as active‑active redundancy within the same city or disaster recovery across different locations—thereby mitigating the risk of complete service interruption due to regional disasters.
3. Applicable scenarios: provincial government clouds, nationwide financial institutions, and rail transit networks—environments with extremely high availability requirements.

• Key Technological Support

1. Fast switching technology: employs virtualization IP migration and session persistence technologies ensure that client connections remain uninterrupted during failover.
2. Data synchronization technology: Real-time synchronization of device configurations and time‑calibration parameters over an encrypted channel ensures consistent states between primary and standby devices.
3. Intelligent Monitoring and Alarms: The monitoring platform continuously tracks device operating status, network links, and satellite signals, triggering alerts immediately upon detecting faults and supporting both automatic switchover and manual intervention.

• Industry Disaster Recovery Use Cases

Case Study: A Disaster Recovery Project for the Core Business System of a Nationwide Insurance Company - Disaster recovery level: Advanced disaster recovery (cluster deployment);

- Deployment Configuration: Deploy three domestically produced DNTS‑9HG time servers in Beijing, Shanghai, and Guangzhou to form a cross‑regional cluster; configure load‑balancing equipment, with clients accessing via a virtual IP address.

- Application Performance: 1. System availability reaches 99.999%, with annual downtime ≤ 5 minutes, meeting the 24/7 operational requirements of core insurance business; 2. During a power outage at the Beijing data center, the Shanghai node automatically took over services within 500 milliseconds, ensuring zero service interruption and no data loss; 3. The cluster supports concurrent synchronization for over 100,000 clients, delivering significant load balancing and reducing single-node workload by 60%.

• Industry Application Value This disaster recovery and backup solution, designed with multiple tiers, meets the time‑synchronization continuity requirements of various industries. It not only ensures the stable operation of business systems but also alleviates the operational burden on IT staff through intelligent monitoring and rapid failover technologies. As critical infrastructure places ever‑higher demands on the reliability of time synchronization, this solution is poised to become a standard configuration across sectors such as finance, government, transportation, and energy, providing essential support for business continuity.