Advanced EGNSS-based timing distribution and synchronisation solution
The CHRISS solution is an integrated into one device Galileo-based timing distribution and synchronisation solution, making critical infrastructure more resilient, available, accurate, reliable, and secure.
The CHRISS Time Synchronization Unit (TSU) offers the following value propositions:
- One of the first GNSS grandmasters with integrated White Rabbit support on the market
- Resiliency & redundancy for local and metro mesh structures with up to 12 White Rabbit ports
- Cost effective solution by combining GNSS PT Clock and multiport White Rabbit Switch function
- Internal rubidium oscillator providing holdover
- Flexible port and GNSS module combinations
- Pay as you grow support
- Redundant power supply – industrial grade design
- User friendly GUI – easy user learning curve
TSU Solution Overview
This video presents the CHRISS Time Synchronisation Unit (TSU) — a next-generation, Galileo-based timing distribution and synchronisation solution designed for critical telecommunications infrastructure, including 5G networks.
The TSU integrates seven key capabilities into a single 1U rack-mount device: multi-frequency GNSS/INS reception across Galileo E1, E5, and E6 bands, robust interference detection and mitigation, spoofing detection, Galileo OSNMA signal authentication, blockchain-based cyber-attack protection, nanosecond-accuracy time distribution, and FPGA-based deterministic signal processing.
As one of the first GNSS Grandmasters on the market with integrated White Rabbit support, the CHRISS TSU delivers a cost-effective, modular, and resilient synchronisation solution — built to meet the demanding accuracy and security requirements of modern telecom networks
Satellite FIX TSU – Technical Demonstration
This video provides a live technical demonstration of the CHRISS Satellite FIX Time Synchronisation Unit (TSU), showcasing its resilience and precision in real-world challenging conditions.
The demonstration covers four key scenarios: GNSS fix acquisition in Grandmaster Mode with real-time CLI and GUI monitoring; active jamming mitigation using an FPGA-based system that suppresses narrowband interference by approximately 20 dB without prior knowledge of the jamming frequency; White Rabbit optical fiber synchronisation validated over both 5-metre and 5-kilometre cables, achieving sub-nanosecond precision; and automatic failover to an internal atomic clock upon GNSS signal loss, with seamless re-acquisition within 60 seconds and 6-nanosecond jitter once the signal is restored.
Throughout the demo, the CHRISS Satellite FIX GUI provides continuous monitoring of module statuses, internal temperature, PTP connections, and blockchain synchronisation state — confirming the TSU as a robust, high-precision timing solution for critical infrastructure.
Blockchain Security Demo
This video demonstrates the blockchain-based security mechanism developed within the CHRISS project and integrated with the Time Synchronisation Unit (TSU). Built on a permissioned Hyperledger Fabric network, the solution enables tamper-proof recording of operational and security-related data – including clock accuracy, GNSS interference presence, authentication status, and device alerts – on a distributed ledger.
The demo showcases live smart contract interactions via an external gateway (REST/Bun-based), allowing applications to securely submit TSU telemetry snapshots to the blockchain, retrieve complete audit-trail histories, and query device or alert records without directly interacting with Fabric commands. It also highlights structured system responses, including successful transactions and error handling for invalid requests or missing records, as well as enforced access control policies that reject unauthorized operations. This blockchain layer provides a robust and transparent interface between external systems and the ledger, adding an additional line of defence against cyber-attacks targeting time synchronisation data in critical infrastructure networks.
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