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Checking the optical attenuation threshold of Huijue switches

Fiber optic splice closure knowledge brief Published 05 Apr 2024

Prepared for preliminary research by the RIVO OPTICAL knowledge desk. Confirm cable count, splice capacity, sealing class, tray layout, protection sleeves and installation requirements against current standards and product documentation.

Huawei switches can monitor optical attenuation through the digital diagnostic monitoring (DDM) features of certified optical modules, allowing you to check both transmit and receive power levels to assess signal loss.Viewing Optical Attenuation

Huawei switches support optical attenuation monitoring via the DDM function of SFP or other optical modules. You can use the following commands:

  • display transceiver interface verbose This command shows detailed information about the optical module, including Current RX Power (dBm) and Current TX Power (dBm), which can be used to calculate optical attenuation by comparing transmitted and received power levels .
  • display transceiver diagnosis interface This command provides diagnostic information, including optical power thresholds and real-time monitoring data, which helps identify if the optical link is experiencing excessive loss .
Interpreting the Data
  • Transmit Power (TX): The optical power sent from the switch.
  • Receive Power (RX): The optical power received at the other end.
  • Optical Attenuation: Calculated as the difference between TX and RX power, indicating the signal loss over the fiber link. Typical single-mode fiber links may have attenuation ranging from 0.2 dB/km to 0.5 dB/km depending on fiber type and distance. Huawei-certified modules also provide high and low threshold alarms for both TX and RX power, allowing the switch to alert you if the optical attenuation exceeds safe limits .
Best Practices
  • Always use Huawei-certified optical modules to ensure accurate DDM readings and reliable monitoring .
  • Ensure the interface is UP before checking optical power, as inactive ports may not report accurate values .
  • For troubleshooting, compare the measured RX power against expected values for the fiber length and type to determine if additional attenuation (e.g., from connectors or splices) is present. By using these commands and interpreting the TX/RX power data, you can effectively monitor optical attenuation on Huawei switches and maintain optimal fiber link performance.

Checking the optical attenuation threshold of Huijue switches - RIVO MULTITRADE OPTICAL SYSTEMS [PDF]

Checking the optical attenuation threshold of Huijue switches

Checking the Optical Module

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Checking the Receive and Transmit Optical Power

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Displaying Optical Module Information

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Technical note

This reference is intended for preliminary fiber optic splice closure research. Compatibility, splice capacity, sealing class, tray layout, protection sleeves, installation methods, test limits and applicable standards must be verified for the specific project.

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