FNO Troubleshooting & Fibre Diagnostics

Step-by-step fault isolation when a Vumatel ONT shows a solid or flashing red LOS indicator. Covers optical power thresholds, patch lead inspection, and FNO escalation triggers.

Interpreting Frogfoot ONT LOS indicators and resolving optical signal faults. Includes device-specific LED reference, light-level thresholds, and escalation conditions.

Complete LED state reference for MetroFibre CPE units. Maps each blink pattern to a specific provisioning, authentication, or optical fault condition.

Full LED status table for Openserve ONTs — PON, LOS, LAN, and Power indicators. Covers each light state, what it means, and when to escalate to the FNO.

Diagnosing red light conditions on Octotel ONT hardware. Includes device-specific LED meanings, optical power checks, and structured FNO escalation steps.

The correct power-cycle sequence for Vumatel, Openserve, and MetroFibre ONTs. Explains why hard resets can wipe provisioning profiles and when a 30-second wait is insufficient.

How power surges and unclean shutdowns during loadshedding affect your ONT, router, and fibre signal. Covers UPS recommendations and post-outage diagnostic steps.

Visual inspection and swap-test methodology for SC/APC fibre patch leads. Covers ferrule damage, bend radius violations, and when to request an FNO replacement.

Comparing UPS and inverter behaviour during loadshedding and how each affects ONT uptime, sync stability, and optical signal integrity on South African fibre connections.

Differentiating between FNO contention-ratio congestion and genuine line faults during peak hours. Includes time-based speed test methodology and CIR verification steps.

Why WiFi speed tests are unreliable for diagnosing fibre faults. Covers wired testing methodology, single vs. multi-thread tests, and how to isolate ISP vs. home network issues.

Identifying the root causes of packet loss on South African fibre — from dirty connectors and micro-bends to FNO congestion and misconfigured QoS. Includes diagnostic commands and escalation criteria.

Step-by-step guide to running and interpreting traceroutes on Windows, macOS, and Linux. Covers hop identification, latency patterns, and how to pinpoint the fault domain.

A structured decision tree for determining whether a fault sits with the ISP, FNO, or customer premises. Reduces unnecessary escalations and speeds up legitimate fault resolution.

Expected repair timelines for each major South African FNO. Covers SLA benchmarks, escalation triggers when deadlines are missed, and what to do if your fault stalls.