Fiber‑tapping is a growing security threat as high‑speed optical networks carry sensitive data for corporate and government users. This application note explains how the ONMSi Optical Network Monitoring System detects unauthorized access by identifying signal attenuation caused when a fiber is bent or accessed at splice points. Even slight manipulation can allow an intruder to siphon data without disrupting service. ONMSi provides continuous monitoring to quickly spot abnormal loss patterns, helping network owners identify tampering, mitigate risks, and maintain the integrity of their optical infrastructure.

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