I. Project Name

High-Precision Time Synchronization System Construction Project for the Yangtze Securities Data Center

II. Duration of Cooperation

2025 Equipment procurement, on-site deployment, and overall acceptance and delivery were completed in the fourth quarter of the year.

• Introduction to Yangtze Securities Co., Ltd.

Changjiang Securities Co., Ltd. was established in 1991 The company is a nationwide, fully licensed, comprehensive securities firm established with the approval of the China Securities Regulatory Commission. 2007 Listed on the Shenzhen Stock Exchange’s Main Board in [year] (stock code: 000783 ), making it one of the earliest brokerage firms to be listed in China.

The company has established a comprehensive financial holding business structure, with wholly owned and controlling subsidiaries spanning investment banking, asset management, futures, private equity, cross-border finance, and other sectors. Its services cover the entire financial services value chain, including wealth management, securities brokerage, investment banking, asset management, proprietary trading, industry research, and cross-border financial services, nationwide. 31 Branches have been established across multiple provinces and municipalities, serving individual investors, institutional clients, and government and corporate entities. The system serves as the core platform for critical functions such as securities trading, funds settlement, business risk control, and client asset custody. It strictly complies with the regulatory requirements of the China Securities Regulatory Commission and stock exchanges regarding network time synchronization and timestamping of trading logs in the securities industry, while imposing stringent construction standards on data center equipment—ensuring unified time‑synchronization accuracy, continuous system stability, and domestic, independently controllable solutions.

IV. Purchased Products

Product Category ： NTP Network Time Server

Product model ：DNTS-9 (Beidou /GPS Dual-mode timing, with a built-in rubidium atomic clock version)

Auxiliary materials : Beidou satellite receiving antenna, redundant power supply modules, cabinet mounting accessories, unified network management software

Product Details ：DNTS-9 It is a domestically developed, high-precision, multi-source time‑synchronization server independently designed by Beijing Zhongxin Chuang, specifically engineered for scenarios with stringent requirements for high reliability, high precision, and regulatory compliance—such as finance, government and enterprise sectors, and telecom operators—and fully compatible with financial data centers. 7×24 It meets the demand for continuous, round-the-clock operation and fully complies with the time‑synchronization specifications and information‑security construction standards of the securities and futures industry. The equipment is built on a domestically produced Hygon XinChuang processor platform and runs on a compatible domestic operating system. Its core timing module, signal‑processing unit, and main control hardware are all independently developed and controllable, thereby mitigating external device‑related security risks and aligning with the financial sector’s national‑domestic‑technology upgrade and transformation roadmap.

In terms of timing accuracy, the device supports BeiDou-3, GPS Multi-constellation dual-mode synchronization ensures compatibility with multiple satellite signal standards, with user‑configurable constellation priority—defaulting to BeiDou‑based time synchronization. The device boasts high reception sensitivity and outstanding performance in cold starts, hot starts, and signal reacquisition, enabling stable satellite lock even in environments with building obstructions or weak signals, thus guaranteeing a precise and reliable time reference. Additionally, it features an integrated high‑performance rubidium atomic clock timing unit and an intelligent pre‑compensation timing algorithm, which, under extreme conditions such as satellite signal loss or link failures, can maintain ultra‑low drift for extended periods, effectively eliminating time deviations caused by satellite outages or network disruptions and ensuring temporal consistency across financial applications.

At the interface and network‑integration level, the device supports multiple independent Gigabit Ethernet ports, enabling physically isolated output across multiple network segments. It seamlessly accommodates diverse, independent network architectures—such as securities‑trading private networks, clearing intranets, and office‑management networks—thereby eliminating cross‑network data interference and associated security risks. Supports NTPv1/v2/v3/v4、 SNTP The full suite of protocols is compatible with mainstream network devices and business systems in the industry. A single device can handle concurrent time‑synchronization requests from tens of thousands of terminals and servers, and its high‑concurrency processing capability fully meets the global time‑synchronization needs of large securities‑firm data centers, delivering efficient, latency‑free, and packet‑loss‑free responses.

In terms of reliability and operations, the device comes standard with a dual-redundant power architecture and supports AC220V Wide voltage input accommodates the complex power supply conditions typical of data centers, while hardware failures trigger millisecond‑level automatic switchover, eliminating single points of failure. The device features a high‑definition LCD display that provides real‑time visualization of key metrics, including the number of satellite signals acquired, timing status, system time, and device operating parameters, enabling intuitive and convenient local operations and maintenance. Paired with a dedicated network management platform, it supports remote status monitoring, parameter configuration, fault alarms, automated log retention, and export of audit reports, offering robust O&M traceability to meet compliance and auditing requirements in the financial sector.

In addition, the equipment features broad operating temperature compatibility and can operate reliably at -10℃ ~ +55℃ Standard data center environment, antenna support -40℃ ~ +75℃ It operates over a wide temperature range, withstands extreme high and low temperatures, resists electromagnetic interference, and delivers robust stability, making it well-suited for diverse data center deployment scenarios. It is the preferred core device for building and upgrading time‑synchronization systems in the financial industry.

V. Customer Requirements

1. Regulatory compliance requirements

Complies with the “Network Time Synchronization Specification for the Securities and Futures Industry ( JR/T 0084 )》Industry standard: All data-center‑level trading servers, counter terminals, risk‑control systems, and database clusters are synchronized to a unified time standard, ensuring that timestamps in transaction logs, clearing records, and operational audit logs are traceable and free from deviation, thereby meeting regulatory annual audit requirements.

2. High-Precision Timing Requirements

Securities intraday trading, after-hours settlement, and high-frequency trading scenarios demand network-wide synchronization accuracy within the nanosecond range. In scenarios such as satellite signal blockage or data center antenna failures, equipment must be capable of maintaining long-term, stable timekeeping independently, without any time drift.

3. High-reliability continuous operation requirements

Financial trading system for the entire year 7×24 Operating continuously around the clock, the time‑synchronization equipment must support hardware redundancy and automatic failover within milliseconds; a single‑unit failure must not disrupt the network’s time‑synchronization service, and its mean time between failures must meet data‑center operations and maintenance standards.

4. Network Compatibility and Operations & Maintenance Requirements

It is compatible with multiple independent network segments, including the securities intranet, the trading isolation network, and the office management network, supporting concurrent synchronization across tens of thousands of terminals and servers; it also supports web pages, SNMP • Dedicated network management software enables remote configuration, status monitoring, and log export, reducing the operational workload of the data center.

5. Information Technology Innovation Security Requirements

The core timing module, satellite receiving unit, and main control hardware have been domestically sourced and selected to mitigate the risks of timing signal tampering and external time-source spoofing, aligning with the financial industry’s strategy for building self-reliant and controllable information systems.

VI. Solution

Beijing Zhongxin Chuang, in alignment with the data center infrastructure and business scenarios of Changjiang Securities, has customized a tiered architecture. NTP Overall timing scheme, core deployment DNTS-9 High-precision clock server:

1. Deployment of Tier-1 Reference Timekeeping Nodes

Multiple units are deployed in the core cabinet of the data center. DNTS-9 As a primary time‑reference device, the equipment supports BeiDou‑3. +GPS Dual-mode satellite synchronization, with timing accuracy better than ±30 ns ; Equipped with a domestically produced rubidium atomic clock, it can maintain accurate timekeeping independently for an extended period after satellite signal loss, ensuring stable time reference even in scenarios where satellite connectivity is interrupted. The device offers optional dual-redundant power supplies and multiple gigabit‑isolated network ports, with automatic failover to the backup unit in the event of a single hardware failure, thereby eliminating single-point failure risks.

2. Hierarchical Network Synchronization Architecture

DNTS-9 Output standard NTP/SNTP Time signals are synchronized with the trading private‑network switch, the clearing database cluster, the counter‑service servers, the risk‑control and monitoring system, and the data‑center operations terminals, ensuring unified standard time across all business network segments. The system supports logical isolation of multiple network interfaces, preventing interference between different business networks and ensuring compliance with security‑isolation standards for the trading intranet.

3. Unified Operations and Maintenance Management System

Supporting facilities DNTS-Manager The network management platform enables centralized monitoring of all clock server operating statuses, satellite lock counts, time offset values, and device fault alarms. It automatically archives year‑long time‑synchronization logs and supports one‑click export of audit reports, meeting regulatory requirements for archiving traceability documentation.

4. Standardization Implementation Services

Providing on-site survey, cabinet installation, outdoor antenna deployment, and network segment synchronization debugging, 72 Hourly continuous stability stress testing, end-to-end implementation of operations and maintenance personnel training, and issuance of a comprehensive acceptance test report upon completion of full-system integration testing.

VII. Implementation Outcomes

1. Time synchronization accuracy meets compliance standards.

All equipment in the entire data center is uniformly synchronized to DNTS-9 Standard BeiDou time is output, with terminal time deviations across the network stably maintained within the regulatory tolerance range; timestamps in transaction, settlement, and risk-control logs are standardized, ensuring successful completion of the annual industry regulatory compliance audit.

2. The system operates stably and reliably.

Since going live, the equipment has maintained stable operation; its redundancy‑switching mechanism has consistently delivered millisecond‑level, uninterrupted time synchronization across multiple simulated fault tests. In scenarios where satellite signals are briefly lost during extreme weather, the built‑in rubidium atomic clock ensures accurate timekeeping, with no service‑time drift observed.

3. Compatible with a full-service network architecture

The multi‑segment, hierarchical time‑synchronization scheme aligns with the security zoning requirements of securities trading, enabling tens of thousands of terminals to synchronize concurrently with zero latency and zero packet loss, without consuming business‑transaction bandwidth or disrupting daytime trading or post‑market batch settlement operations.

4. Lightweight Operations and Maintenance Management

The centralized network management platform streamlines daily data center inspections, proactively pushes fault alerts, and automatically stores and archives audit logs in a synchronized manner, significantly reducing the workload of operations personnel in log organization and time‑offset troubleshooting.

5. Meet the requirements of the information infrastructure construction plan.

DNTS-9 The domestically developed core hardware architecture complies with Changjiang Securities’ standards for the transformation of its information technology innovation‑driven data center, and the time‑synchronization link is free from risks associated with external, uncontrollable time sources, thereby strengthening the security foundation of the financial information system.

VIII. Summary of Similar Industry-Specific Implementation Cases

(1) Banking Institutions

People’s Bank of China, Bank of China, Postal Savings Bank of China, Industrial and Commercial Bank of China, Bank of Communications, China Merchants Bank, CITIC Bank, Shanghai Pudong Development Bank, Shanxi Bank, Jiangsu Bank, Chongqing Bank, Qinghai Bank, Cangzhou Bank, Guiyang Bank, Changsha Bank, Shaoxing Bank, Baoshang Bank, Hankou Bank, Rural Credit Union Funds Clearing Center, Hubei Bank, Lishui Rural Commercial Bank, Tangshan Bank, China Resources Bank of Zhuhai, Baoding Rural Commercial Bank, Guilin Bank, Jiangyin Rural Commercial Bank, China Guangfa Bank, Chongqing Fumin Bank, China UnionPay Shanghai Center, Taizhou City Commercial Bank, Hubei Rural Credit Union, Jiangsu Jiangnan Rural Commercial Bank, Zhejiang Pinghu Rural Cooperative Bank, Huarong Xiangjiang Bank, Hebei Provincial Rural Credit Cooperatives, Yunnan Provincial Rural Credit Cooperatives, Guiyang Rural Commercial Bank, Nanxun Rural Cooperative Bank, Deqing Rural Cooperative Bank, Huzhou Wuxing Rural Cooperative Bank, Liaoning Provincial Rural Credit Cooperatives, Beijing Rural Credit Cooperatives, Zhejiang Provincial Credit Union, Guangxi Rural Credit Cooperatives, Jiaxing Hecheng Commercial Bank, Zhejiang Provincial Rural Credit Cooperatives, Yunnan Longchuan Rural Commercial Bank, Shandong Provincial Urban Commercial Banks, Langfang Bank, Guangxi Beibu Gulf Bank, People’s Bank of China Credit Reference Center, Lianghe Rural Commercial Bank, Jiangsu Zhangjiagang Rural Commercial Bank, Wuhan Rural Commercial Bank, Leshan City Commercial Bank, Beijing Rural Commercial Bank, Henan Rural Commercial Bank.

(II) Securities, stock exchanges, and asset management and trust institutions

Shanghai Clearing House, China International Capital Corporation, Shenzhen United Property Exchange, Shanxi Securities, Changjiang Securities, Huatai Securities, CITIC Securities, Jianxin Trust, China Asset Management, Xinhua Asset Management, Hua’an Fund, Hualong Securities, China Securities Finance Corporation, China Securities Depository & Clearing Corporation, and Jianxin Fund.

(3) Insurance Institutions

China Life, Yingda Property Insurance, Xinhua Life, Dubang Property Insurance, Taikang Insurance, Xintai Life, Yingda Insurance, Xingfu Life, Xinhua Pension, Huatai Insurance, Shenzhen Ping An, Guoyuan Agricultural Insurance