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Fibre & Internet

Diagnose red LOS lights, ONT sync failures, packet loss and slow speeds on every major South African FNO.

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Fibre & Internet
Solved· 8 min read 42.1k
Openserve fibre red LOS light: 7 fixes that actually work
A red LOS light means your ONT has lost signal from the OLT. Here's how to diagnose whether it's a dirty connector, a kinked drop cable, or a Telkom-side outage — and what to log with your ISP.

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