Media Converter LED Guide

▸ Device Layout

FIBER

Single-Mode
SC/UPC

Media Converter

PWR

FX
Link

LAN
Link

FDX

1000

100

ETHERNET

Cat5e/Cat6
RJ-45

● LED Indicators — All 6

PWRPower

Device is powered on and running

STABLE

FX LinkFiber Side

Fiber link status ✦ BLINKING → Data flowing ✔ ✦ STABLE ON → Link up, no data ✘

BLINK=OK

LAN LinkEthernet Side

Ethernet link status ✦ BLINKING → Data flowing ✔ ✦ STABLE ON → Link up, no data ✘

BLINK=OK

FDXFull Duplex

Tx & Rx simultaneously active

STABLE

1000Gigabit

Speed negotiated at 1 Gbps

STABLE

100Fast Eth

Speed at 100 Mbps — only if 1000 is OFF

IF LIT

💡

KEY RULE — For Network to Work:
Both FX Link (Fiber) and LAN Link (Ethernet) LEDs MUST BLINK.
▸ Stable ON = Link connected but NO data → Network will NOT work.
▸ Blinking = Active data flow → Network working ✔

⚡ Quick Debug

FX Link stable (not blinking) → No data on fiber. Check OFC patch cord, far-end device, or fiber splice.

LAN Link stable (not blinking) → No data on copper side. Check router/switch port, RJ-45 cable, or IP config.

FX Link OFF → Fiber not connected or far-end down. Check SC connectors & fiber.

LAN Link OFF → Ethernet not linked. Check RJ-45 cable & switch port.

100 LED ON (1000 OFF) → Speed downgraded to 100M. Check cable quality or port capability.

FDX OFF → Half-duplex mode. Expect slowness & collisions. Check NIC/switch settings.