PRE

Technical Explanation

To guarantee 99.99999% (seven-nines) reliability for industrial robotics and remote surgery, relying on standard packet retransmissions (ARQ) introduces unacceptable delay. The PRE function replicates every critical packet at the ingress node, sending duplicate copies over physically independent fiber and wireless paths. The egress node forwards whichever packet arrives first and cleanly discards the duplicate, achieving instantaneous hitless failover even if an entire fiber line is severed.

Key Functions

• Hitless, zero-millisecond failover resilience against physical transport line cuts
• Duplication of critical packets across completely disjoint physical network paths
• Deduplication and sequence re-ordering at the egress node with zero buffer latency
• Delivering 99.99999% reliability without relying on time-consuming retransmission handshakes
• Standardized integration with IETF DetNet and IEEE 802.1CB Frame Replication