As the core time source for time synchronization, the satellite timing system’s signal security and stability directly determine the reliable operation of the entire time synchronization framework. In complex network environments and under external threats, satellite signals may face security risks such as malicious interference, forgery and tampering, and unauthorized access, thereby compromising the timing accuracy of backend time servers and the normal operation of business systems. In response to the security protection needs of satellite timing signals, Beijing Zhongxinchuang Technology Co., Ltd. has developed and launched The DNSIS series of satellite security isolation devices comprises two major categories—relay‑type and generation‑type—providing a comprehensive signal‑security protection solution for satellite timing systems.

The core functions of the DNSIS series satellite security isolation devices are to perform secure filtering, anomaly detection, and stable signal output for satellite signals, thereby establishing a “security gateway” for satellite timing signals. The relay‑type products (DNSIS‑611A/DNSIS‑611B) employ real‑time signal detection and filtering technologies, enabling end‑to‑end monitoring of received BeiDou, GPS, and other satellite signals. Through multi‑algorithmic processes—including signal‑feature analysis, frequency detection, and code‑pattern verification—they accurately identify and eliminate anomalous signals such as interference and spoofing, forwarding only legitimate, stable satellite signals to the downstream time server. This ensures the purity and security of the time source. These products support signal processing across multiple satellite systems, with transmission latency as low as the microsecond level—without compromising timing accuracy—and can be deployed directly between the satellite antenna and the time server. They are easy to install and configure, requiring no modifications to the existing system architecture.

Generative products ( DNSIS-612A/DNSIS-612B builds on the foundation of relay‑type products by adding the capability to autonomously generate standard satellite signals, offering dual functionality: “signal protection plus emergency time synchronization.” When satellite signals are completely lost due to severe interference, malicious attacks, or physical obstruction, the generator can rely on its built-in high‑precision timing module to independently produce standard time signals that match the satellite signal format, continuously providing a stable time source to downstream time servers and ensuring uninterrupted operation of the timing system. The generator’s timing module employs either a high‑precision oven‑controlled crystal oscillator or a rubidium atomic clock, delivering exceptional timing accuracy and allowing flexible configuration to meet diverse application requirements for emergency timekeeping.

In terms of hardware design and safety performance, The DNSIS series of satellite security isolation devices employs hardware‑level signal processing technology. All signal detection, filtering, and generation are performed by dedicated hardware chips, eliminating reliance on software and thereby mitigating software‑based vulnerabilities and processing delays. The equipment supports encrypted signal transmission, enabling encryption of satellite signals to prevent interception or tampering during transit and ensuring secure data delivery. Additionally, the device boasts excellent electromagnetic compatibility, having successfully passed numerous authoritative EMC tests, allowing it to operate effectively in complex electromagnetic environments such as server rooms while resisting external electromagnetic interference and maintaining stable performance.

In terms of device deployment and compatibility, The DNSIS series of satellite‑based security isolation devices feature a standard 1U rack‑mount design, with a compact footprint that allows for flexible deployment in data center racks. They are installed between the satellite antenna feed line and the time server’s satellite signal input interface, without requiring any changes to the existing time‑synchronization system topology. The equipment supports processing signals from multiple satellite systems, including BeiDou, GPS, and GLONASS, and seamlessly integrates with the entire Sinovate time‑server product line while remaining compatible with mainstream time‑server products on the market, ensuring excellent versatility and interoperability. Configuration and management can be performed via a web interface or through a serial port, offering simple, intuitive operation that enables operations personnel to quickly configure parameters and monitor system status.

In terms of operational status monitoring and alerting, The DNSIS series devices support real-time monitoring of critical parameters such as satellite signal quality, equipment operating status, and signal‑processing results, presenting operational conditions clearly via indicator lights and a web interface. When signal anomalies or equipment malfunctions are detected, the devices can output alarm signals through an alarm interface and seamlessly integrate with the Zhongxin Chuang intelligent network‑wide time‑synchronization monitoring software, enabling real-time upload of alert information to the monitoring platform. This allows operations and maintenance personnel to promptly assess signal security and swiftly address any issues. The DNSIS series of satellite‑based security isolation devices has become standard protective equipment in sectors with stringent time‑security requirements, including government services, finance, rail transit, energy, and national defense. For instance, in the time‑synchronization system of a provincial government cloud platform, the DNSIS‑612A generative device provides robust protection for satellite timing signals, effectively countering external signal interference. Even during multiple brief interruptions of satellite signals, it maintains continuous time synchronization for government systems by autonomously generating backup signals. In the data center of a state‑owned bank, the DNSIS‑611B relay‑type device is deployed between the satellite antenna and the time server, filtering out potential malicious signals and ensuring the security and accuracy of the financial transaction system’s time reference. Meanwhile, in a city’s rail‑transit signaling system, the DNSIS series, working in tandem with a standalone BeiDou time server, establishes a dual‑layer safeguard—“autonomous timekeeping plus signal‑security protection”—thereby ensuring the safe and reliable operation of the train‑dispatching system.

As satellite timing technology is increasingly deployed across critical infrastructure, the need for robust security protection of satellite signals has become ever more pressing. The DNSIS series of satellite security isolation devices, leveraging specialized signal-processing technologies and robust hardware design, fortify the security perimeter of satellite timing systems, effectively mitigating risks such as signal interference and malicious attacks. This ensures the stable operation of time‑synchronization systems and provides critical support for safe production and business operations across various industries.