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Troubleshooting Guide

CloudEngine 16800, 12800, 12800E, 8800, 7800, 6800, and 5800 Series Switches

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Huawei uses machine translation combined with human proofreading to translate this document to different languages in order to help you better understand the content of this document. Note: Even the most advanced machine translation cannot match the quality of professional translators. Huawei shall not bear any responsibility for translation accuracy and it is recommended that you refer to the English document (a link for which has been provided).
What Precautions Should Be Taken When Optical Interfaces Are Connected?

What Precautions Should Be Taken When Optical Interfaces Are Connected?

When optical interfaces are connected, the interfaces cannot go Up if the installed optical modules or fibers are abnormal. When connecting optical interfaces, pay attention to the following points:
  1. Check whether the optical module type is supported by the switch interfaces based on the switch model and interface type. It is recommended that optical modules that are certified by Huawei Ethernet switches be used on CE series switches.

  2. Ensure that the parameter settings such as the rate, wavelength, and transmission distance of connected optical modules are the same.

  3. Ensure that the optical fiber model matches the optical module type.

    A multi-mode optical fiber can be used with a single-mode optical module if the transmission distance is short. However, you are advised to use a multi-mode optical fiber with a multi-mode optical module. Single-mode optical fibers can only be used with single-mode optical modules.

    Some optical modules may provide different transmission distances when working with different optical fibers. Therefore, select proper optical fibers according to the transmission distance.

  4. Check whether the working modes of connected optical modules are correct, including the receive power, transmit power, and current.

    • If the transmit power of an optical module is too high or low, replace the optical module.
    • If the receive power of an optical module is too low or too high, perform the following operations:
      1. Replace the optical module or fiber.
      2. Check whether the transmission distance of the optical module and optical fiber type meets requirements.
      3. Use an optical power meter to measure the optical power attenuation of each part of links and recover the problematic link.
  5. Ensure that the parameter settings such as the interface status, rate, and auto-negotiation mode of connected optical interfaces are the same.

If connected optical interfaces do not go Up, locate the faults by referring to Two Connected Optical Interfaces Cannot Go Up.

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Updated: 2020-01-07

Document ID: EDOC1000060766

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