Sync1PPS - Cyber-Resistant, No-delay Precision Time Synchronization System
Abstract
SYNC1PPS is a hardware-based precision time synchronization system designed for critical control and measurement installations operating at distances from 100 to 2,000 meters. The system delivers synchronization accuracy better than 5 nanoseconds through a purely hardware architecture that eliminates network vulnerabilities associated with Ethernet-based protocols. A key innovation is the real-time automatic compensation of transmission delays caused by cable or fiber optic length variations, temperature changes, and atmospheric pressure fluctuations. Operating independently from GPS through rubidium atomic clock technology, SYNC1PPS maintains holdover accuracy better than 500 nanoseconds per day, ensuring continuous operation during GNSS jamming or disruption. The modular design supports both RS422 twisted-pair and single-mode fiber optic transmission media, making it suitable for defense systems, power installations, industrial control networks, and other mission-critical applications requiring cyber-resilient time distribution.
GPS-Independent and Cyber-Secure Synchronization
Modern control and measurement installations face critical vulnerabilities in time synchronization. GPS-based systems, while widely used, are susceptible to both intentional jamming attacks and anti-satellite weapons that can disable positioning systems across entire regions. For critical infrastructure such as radar networks, air defense systems, power installations, and industrial control systems, loss of time synchronization can result in compromised target acquisition, failed defense operations, and system-wide failures.
Traditional network-based synchronization protocols like PTP (Precision Time Protocol) operating over Ethernet networks introduce additional cybersecurity risks. These software-based solutions are vulnerable to cyberattacks at the network layer, creating potential entry points for malicious actors to compromise time-critical operations. The need for a hardware-based, GPS-independent synchronization system that maintains precision while resisting cyber threats has become essential for mission-critical applications in defense, energy, and industrial sectors.
The SYNC1PPS Solution
SYNC1PPS is a hardware-based precision time synchronization system designed for medium-distance installations ranging from 100 to 2500 meters. The system achieves synchronization accuracy better than 5 nanoseconds while maintaining cyber resilience through its purely hardware-based architecture that eliminates Ethernet/PTP network dependencies.
System Architecture
The SYNC1PPS system consists of three primary components operating within the modular KJK-1200 platform:
By using simple fiber-to-RS422 media converters, it is possible to implement a delay compensation loop across various types of transmission links. This setup allows the system to measure and offset the time it takes for a signal to travel through the network. The critical requirement for this method to function accurately is the symmetry of all communication links connected in series; the latency must be identical in both the transmit (TX) and receive (RX) directions to ensure the compensation calculations remain valid.
Real-Time Automatic Delay Compensation
A critical feature of SYNC1PPS is its real-time automatic compensation system that continuously adjusts for transmission delays. With each synchronization pulse, the transmitter measures round-trip signal propagation time and dynamically corrects timing parameters to maintain identical time domains across all receivers. This hardware-based compensation system automatically corrects in real-time for variations caused by cable or fiber optic length differences, temperature fluctuations, and atmospheric pressure changes. The continuous measurement and adjustment process ensures that synchronization accuracy is maintained without manual intervention, regardless of environmental conditions or installation-specific parameters.
Cyber Security Features
Unlike network-based synchronization protocols, SYNC1PPS operates entirely at the hardware level without Ethernet connectivity, making it inherently resistant to network-based cyberattacks. The system's purely physical signal distribution eliminates software vulnerabilities associated with NTP and PTP implementations, providing defense-grade security suitable for military and critical infrastructure applications.
Operational Flexibility
The modular KJK-1200 platform allows customized configurations from simple TTL signal distributors with BNC connectors to advanced systems incorporating redundant GNSS receivers, atomic clocks, and multiple SYNC1PPS transmitter/receiver pairs. All units support power from 230V AC or 12-72V DC sources, with support for up to four redundant power supplies of identical or different voltages.