Article Overview
On a dual-port optical module, the LEDs should show solid green for normal operation, blinking green for active data transmission, amber for warnings, and no light if the port is inactive or disconnected.
LED Color and State Meanings
Green LED:
- Solid green indicates the port is connected and operating normally at the negotiated speed.
- Blinking green shows active data transmission or reception, with faster blinking often indicating higher traffic levels . Amber LED:
- Solid amber signals a warning or minor issue, such as a lower link speed, duplex mismatch, or minor hardware concern.
- Blinking amber may indicate collisions, errors, or that the module is resetting or updating firmware . No Light:
- Indicates the port is inactive, disconnected, or the module is not receiving power. This may also suggest a faulty cable or module . Dual-Color or Tri-Color LEDs:
- Some modules use dual-color LEDs (green/amber) or tri-color LEDs (green/amber/light-blue) to provide additional status information. For example, light-blue may pulse briefly during boot or diagnostics before showing the final operational status .
Correct Operation for Dual-Port Modules
- Both ports should ideally show solid green when connected to a compatible device and functioning correctly.
- During data transmission, the LEDs may blink green to indicate activity.
- If a port shows amber or no light after the system has completed boot and diagnostics, it may indicate a problem requiring troubleshooting.
- Temporary blinking or color changes during POST or boot are normal and do not indicate a fault .
Troubleshooting Tips
- Verify the fiber or copper connections are properly seated.
- Check module compatibility with the switch or device.
- Use CLI commands (e.g.,
show fiber-ports-optical-transceiveron Cisco switches) to confirm module status and diagnostics . - Monitor DDM (Digital Diagnostics Monitoring) parameters such as Tx/Rx power, temperature, and voltage to ensure the module is within normal operating ranges . By following these LED indications, you can quickly assess the operational status of each port on a dual-port optical module and identify potential issues for troubleshooting.
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