# Frogfoot LOS Light Meaning & Fix

Source: https://urbanx.co.za/knowledge-hub/fno-troubleshooting/frogfoot-los-light-meaning-fix

**Answer:** A red LOS light on a Frogfoot ONT means the optical signal from the fibre network is not reaching your device. This usually indicates a line fault, fibre break, or access-layer outage. If LOS remains red after proper power cycling and cable checks, escalation to the FNO is required.

Part of [FNO Troubleshooting & Fibre Diagnostics](https://urbanx.co.za/knowledge-hub/fno-troubleshooting) · 7 min read · by UrbanX Network Operations

## What the Problem Means

If your Frogfoot ONT shows a red LOS (Loss of Signal) light, the ONT is not detecting optical light from the fibre distribution network. This is an access-layer signal issue, not a router, WiFi, or gaming performance problem. A persistent red LOS means the ONT cannot establish a physical optical link to the exchange.

In South Africa, fibre infrastructure is split between three responsible parties:

- The User — power, patch lead, internal setup
- The ISP — authentication, provisioning
- The FNO (Frogfoot) — physical fibre line and signal

> **WARNING:** A red LOS almost always indicates a break or signal interruption between your home and the Frogfoot distribution point.

## Why It Happens

Common causes on Frogfoot infrastructure:

- Fibre break between home and street cabinet
- Damaged or bent fibre patch lead
- Loose connector at ONT
- Area maintenance or outage
- Power instability affecting ONT boot sequence

> **INFO:** If the PON light is off and LOS is red, the ONT is not registered to the network because no optical signal is detected.

## Frogfoot ONT Light Meaning Table

| Light | State | Meaning | Action Required |
| --- | --- | --- | --- |
| Power | Off | No power | Check power source |
| Power | Green | Device powered | Continue checks |
| PON | Flashing | Attempting registration | Wait 2–5 minutes |
| PON | Solid Green | Registered to network | Signal OK |
| LOS | Red (Solid/Flashing) | Optical signal lost | Diagnose fibre path |
| LAN | Flashing/Green | Router connected | Not a fibre signal fault |

> **TIP:** If LOS remains red beyond 5 minutes after restart, the issue is not a temporary sync delay.

## Step-by-Step Fix

1. **Confirm Stable Power**
   - Ensure ONT adapter is firmly plugged in.
   - If using a UPS during loadshedding, confirm output is stable.
2. **Inspect Fibre Patch Lead**
   - No tight bends.
   - No visible damage.
   - Fully inserted into ONT.
   - Avoid unplugging unless necessary.
3. **Power Cycle Correctly**
   - Switch OFF ONT.
   - Wait 2 full minutes.
   - Switch ON.
   - Allow 5 minutes for sync attempt.
4. **Observe Boot Sequence**
   - Power solid.
   - PON blinking.
   - PON solid.
   - LOS off.
   - If LOS turns red and stays red, signal is not reaching the ONT.
5. **Check With Neighbours**
   - If multiple Frogfoot users nearby are offline, it is likely an area-level outage.

> **WARNING:** If all steps fail, escalation is required. The ISP cannot repair physical fibre infrastructure — Frogfoot must restore signal at the access layer.

## Definition: LOS and PON (Access Layer Context)

- **Access Layer** — The physical fibre segment between your property and the fibre distribution network.
- **LOS (Loss of Signal)** — Indicates no detectable optical light is reaching the ONT.

> **INFO:** If LOS is active, authentication cannot occur because signal transmission has failed before network registration.

## When to Escalate

Escalate to your ISP when:

- LOS remains red after proper restart
- Patch lead is intact
- No internal cable damage
- Neighbours report similar outage

In South Africa, Frogfoot repair timelines typically range from 24–48 hours for minor faults and up to 72 hours for fibre breaks or cabinet damage.

> **INFO:** If a fibre break is detected at the street level, this requires FNO technician dispatch. The ISP cannot repair physical fibre infrastructure.

## Responsibility Breakdown

| Layer | Responsible Party |
| --- | --- |
| ONT power & patch lead | User |
| Authentication & support ticket | ISP |
| Fibre line & street cabinet | Frogfoot (FNO) |

Understanding this prevents unnecessary router resets or WiFi troubleshooting.

## When This Is NOT the Issue

If all of the following are true, this is not your fault domain:
- PON is solid green
- LOS is off
- Internet connects but drops intermittently

Then the issue is not optical signal loss.

## Frequently Asked Questions

**Does loadshedding cause a permanent red LOS light?**

No. Power cuts can reboot the ONT, but a persistent red LOS indicates a fibre signal interruption, not power fluctuation.

**Can I fix a red LOS myself?**

Only if it is a loose patch lead or power issue. If the fibre line outside is damaged, it requires FNO repair.

**Should I reset my router?**

No. Router resets do not affect optical signal. LOS is upstream of the router.

**How long does Frogfoot take to fix fibre faults?**

Typically 24–72 hours depending on fault severity and technician availability.

**Is flashing LOS different from solid red?**

Both indicate signal loss. Flashing may occur briefly during boot, but persistence beyond 5 minutes requires escalation.