Article Abstract The data center time‑synchronization system is a core component of information‑technology infrastructure. Standardized deployment and construction, compliant cabling practices, and rigorous equipment commissioning and acceptance procedures are essential to ensuring stable, unified, and regulatory‑compliant time distribution across the entire facility. Drawing on more than two decades of industry experience from Zhongxin Chuang, this paper provides a systematic overview of comprehensive construction plans for small, medium, and large data centers, including equipment selection criteria, cabling and installation standards, commissioning procedures, common installation challenges, and official acceptance guidelines—offering a complete, practical reference for new‑build, renovation, and upgrade projects in government and enterprise data centers.

I. Core Objectives and Construction Standards for Data Center Time Synchronization System Development

As the core infrastructure housing server clusters, network equipment, business systems, and data storage, the data center relies on operational logs, transaction data, system alerts, security incidents, and O&M records for all its devices. Accurate Unified timestamp support. If the time on data center equipment is out of sync or fails to meet the required synchronization accuracy, it can directly lead to a host of issues, including failed data reconciliation, inability to trace the root cause of security incidents, abnormal system interconnections, and unsuccessful project acceptance.

The construction of the data center time synchronization system strictly adheres to national and industry standards, including the “Technical Requirements for Time Synchronization in Computer Information Systems,” the “Technical Specifications for Time Synchronization in Power Systems,” and the “Time‑Serving Standards for Rail Transit Signaling Systems,” in order to… “ Controllable at the source, meeting precision standards, globally unified, stable and redundant, compliant and traceable. ” With core infrastructure construction as the primary objective, differentiated deployment plans are developed for small-scale general-purpose server rooms, medium-sized campus data centers, and large-scale core data centers, ensuring alignment with the precision, stability, and compliance requirements of each specific scenario.

II. Differentiated Construction Plans for Data Centers of Varying Scales

(1) Small-scale data centers (government and enterprise offices, departmental server rooms, small and medium-sized enterprises)

Small data centers have a limited number of devices, a simple network architecture, and no requirements for ultra-high precision; therefore, their core infrastructure is designed to be low-cost, easy to deploy, and maintenance-free. The solution adopts… Single unit NTP Time server Deployment mode: select Zhongxin Chuang. DNTS-9 Universal device, single BeiDou / Dual-mode optional, connects to the core switch via NTP The protocol provides millisecond‑level time synchronization for data center servers, switches, monitoring equipment, and office terminals, meeting the needs of daily operations and maintenance, log tracing, and basic compliance. It requires no redundant deployment, features simple installation and convenient commissioning, and is fully compatible with small‑scale data center environments.

(2) Medium-sized data centers (in industrial parks, universities, hospitals, and local state-owned enterprises)

Medium-sized data centers feature a large number of terminal devices, complex business systems, and multiple network layers, placing higher demands on the stability and continuity of time synchronization. The standard construction plan adopts… Primary-standby dual NTP Server redundancy architecture , Both devices are simultaneously connected to the core network, serving as hot backups for each other. When the primary device fails, the backup device automatically and seamlessly takes over, eliminating any interruption in time synchronization. The equipment is equipped with industrial-grade temperature-compensated crystal oscillators to ensure reliable performance even after satellite signal loss. 72 Hourly stability and punctuality, achieving millisecond-level synchronization across all network devices. Accurate Synchronized and compliant with standard industry acceptance criteria.

(3) Large-scale core data centers (financial head offices, government clouds, power dispatch centers, research centers)

Large-scale core data centers host critical core business applications and impose extremely stringent requirements for time‑synchronization accuracy, system stability, and security compliance, necessitating the deployment of an integrated time‑frequency system that delivers high precision, full redundancy, and comprehensive monitoring. The overall architecture adopts… Primary Master Clock + Secondary Aggregation Clock +PTP High-precision synchronization A hierarchical architecture is adopted, with a high‑end rubidium atomic clock serving as the master clock to ensure exceptionally long‑term timekeeping stability; meanwhile, deployment is carried out… NTP+PTP Dual-protocol networking, compatible with standard terminals. NTP Millisecond-level synchronization, compatible with precision equipment and core business systems. PTP Nanosecond-level synchronization; a network-wide time monitoring platform is deployed to track device status, synchronization accuracy, and signal quality. 24 Hourly visual monitoring, combined with a satellite isolation device, dual antennas, and dual power supplies featuring multi‑level redundancy, forms a time‑synchronization system.

III. Standardized Cabling and Construction Specifications for Computer Rooms

Cable installation is a critical step in ensuring the stability of a timing system; non‑compliant wiring can easily lead to signal interference, excessive latency, synchronization jitter, and satellite lock loss. All installation procedures are rigorously conducted in accordance with industry‑standard specifications.

1. Satellite Antenna Wiring Standards : The satellite antenna must be installed in an open, unobstructed outdoor area free from electromagnetic interference, well away from sources of interference such as base stations, transformers, variable-frequency drives, and high-voltage power lines. Use dedicated low-loss RF cables for the antenna feeders, keeping cable lengths within the specified limits; for excessively long runs, install signal amplifiers. Ensure that the cables are fully shielded and properly grounded throughout to prevent electromagnetic interference. During installation, avoid excessive bending or crushing to preserve the cable’s signal transmission performance.

2. Network Cabling Standards : The time‑synchronization device is connected to the core switch via Category 6 or higher‑grade Gigabit Ethernet cables, ensuring low network latency and minimal jitter; a dedicated VLAN is configured for time synchronization. VLAN , logically isolated from the business network and the office network to prevent synchronization accuracy degradation caused by network congestion or data contention; all network interfaces are securely fastened to prevent loosening or poor contact that could result in device disconnection.

3. Wired B code / Pulse Signal Wiring Guidelines ：IRIG-B code, 1PPS、10MHz The reference signal shall be routed using shielded twisted-pair cabling, with dedicated wiring that is not installed in the same conduit as power lines. For short‑distance transmission within the equipment room, the following shall be used: DC-B Code, for long-distance transmission within the plant area, select AC-B Cable management: After wiring is completed, ensure proper cable labeling and implement grounding and lightning protection measures to guarantee distortion-free, latency-free signal transmission.

IV. Equipment Rack Installation and System Commissioning Procedure

1. Equipment mounting and securing : Mount the time server in a standard rack, ensuring the installation location provides adequate ventilation and heat dissipation, and avoiding areas with high temperatures, high humidity, or excessive dust accumulation. Secure all device interfaces, power cords, and antenna feeders to ensure stable connections.

2. Satellite signal debugging After powering on the equipment, adjust the antenna angle and search for BeiDou satellite signals, ensuring that the number of locked satellites meets the required threshold and that signal strength remains stable. Verify that there is no signal interference or loss-of-lock, and record the signal parameters for documentation and archiving.

3. Network Parameter Configuration : Configure device static IP , gateway, DNS , open NTP/PTP Protocol services allow you to configure the terminal synchronization polling interval to adapt to the data center’s network environment; enable dual-protocol redundancy and link‑backup features to enhance system stability.

4. Full-network terminal synchronization debugging : Perform batch debugging of data center servers, switches, industrial control devices, and monitoring terminals; centrally configure the time‑synchronization server address; and test terminal synchronization偏差 to ensure unified network-wide timekeeping with accuracy meeting specified standards.

5. Monitoring platform integration and debugging : Integrate with the enterprise-wide time‑monitoring platform to enable device‑status monitoring, data analytics, anomaly alerts, and log storage, thereby achieving end-to-end visualized operations and maintenance.

V. Core Indicators and Detailed Rules for Project Acceptance

1. Accuracy Metric Acceptance : Standard computer room NTP Synchronization bias ≤1ms , Industrial Core Data Center ≤0.5ms , High-precision scientific research and finance scenarios PTP Synchronization bias ≤10ns , all equipment maintains stable synchronization accuracy without exceeding specified limits.

2. Stability Acceptance : consecutive 72 During continuous operation testing over a 24-hour period, there were no satellite lockouts, device disconnections, time jumps, or synchronization failures, and the star‑loss timing performance met the required standards.

3. Functional Acceptance : Functions such as protocol output, signal distribution, redundant switchover, alarm notifications, log storage, and remote operations and maintenance are all functioning properly, with no missing features.

4. Compliance Qualification Acceptance : We provide complete equipment test reports, metrological calibration certificates, system certifications, software copyright registrations, and industry-specific qualifications, ensuring compliance with project filing and audit requirements.

5. Safety Acceptance : Classified and domestically developed IT projects must verify a pure BeiDou hardware architecture, domestic software‑hardware compatibility, the absence of risks associated with foreign‑origin signal access, and compliance with network isolation and access‑control requirements.

VI. Common Construction Issues and Solutions

1. Weak satellite signal and a small number of detected satellites. : Investigate antenna blockage, cable loss, and electromagnetic interference; adjust the antenna installation position; replace with low-loss feeders; and ensure proper shielding and grounding.

2. Terminal synchronization deviation exceeds the threshold. : Optimize network links, allow traffic UDP123 Ports, troubleshoot network congestion, adjust the synchronization polling interval, and enable secondary relay timekeeping when necessary.

3. Primary/Standby Device Switchover Failure Reconfigure the redundant networking parameters and debug the device heartbeat detection mechanism to ensure seamless failover.

4. Monitoring platform data anomaly : Check the network connectivity and device permission configurations, restart the backend services, and calibrate the data collection mechanism.