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How to do if Transmit or Receive Power Is Abnormal on Optical Port of Switches

Recently, we got the feedback from our customers that if the transmit or receive power is abnormal, can optical ports connecting two switches work normally? Therefore, we are talking about how to do if transmit or receive power is abnormal on optical port of switches in this article.

If the power of optical ports connecting two switches is abnormal, the following situations may occur:

1, The type and wavelength of the local and remote optical modules are inconsistent.

2, The optical module is incorrectly installed or the optical fiber is faulty.

3, The fiber is too long or the fiber attenuation is too high.

4, The remote transmit power is out of the allowed range.

5, The optical module is faulty.

S6720-26Q-SI-24S-AC S6720-30C-EI-24S-AC

When the transmit/receive power of the optical ports is too high, optical modules on the ports may be damaged. In this case, connect an attenuator to the optical modules.

When the transmit/receive power of the optical ports is too low, error packets or packet loss may occur on the optical ports or the ports may be Down. In this case, you are advised to:

  • Check whether the fiber length between the two ports is within the maximum transmission range of the optical modules on the ports. The fiber length must be shorter than the maximum transmission distance of an optical module. If the fiber length exceeds the maximum transmission distance of the optical modules, shorten the fiber length or use optical modules with a longer transmission distance.
  • Check whether the fiber between the two ports is damaged. Remove and reinstall the fiber and optical module to ensure they are properly connected, check whether the fiber connector is dirty or damaged. If so, clean or replace the connector.

SFP TX Power

When connecting switches through optical ports, pay attention to the following points:

  • The optical modules used on both ends must have the same wavelength. Run the display transceiver [ interface interface-type interface-number | slot slot-id ] [ verbose ] command to check optical module information on the interface. The Wavelength(nm) field in the command output indicates the wavelength of an optical module. If the two optical modules have different wavelengths, replace one optical module to ensure that the two optical modules have the same wavelength.
  • The receive power must be within the range required by the optical modules. Ensure that the transmit optical power on the remote device exceeds the lower threshold.
  • The transmission distance of an optical module is affected by the optical fibers connected to it. For example, when an OMXD30000 10GE SFP+ optical module uses OM1 multimode optical fibers, its transmission distance is 0.033 km. When this optical module uses OM3 multimode optical fibers, its transmission distance is 0.3 km.
  • Check whether the fiber type matches the optical module. Ensure that the fiber type matches the optical module: a multimode fiber, generally distinguished by an orange outer sheath, is used together with a multimode optical module; A single-mode fiber, generally distinguished by a yellow outer sheath, is used with a single-mode optical module.

Huawei SFP XFP

  • The optical modules used on both ends must have the same transmission speed, and the interface configurations on both ends must comply with related protocols.
  • Check the optical module type, the type of optical modules used on the two ports is not restricted. For example, a port with an XFP optical module can communicate with a port with an SFP+ optical module, as long as they meet the preceding requirements.
  • Check whether the local and remote devices use the same type of optical modules from the same vendor. If the connected optical modules have the same wavelength and provide short-distance transmission but alarms indicating low or high optical power occur, the two optical modules may be from different vendors. Although these optical modules have the same wavelength, optical power alarms occur because different vendors design different optical power indicators for these optical modules. To rectify the fault, use optical modules from the same vendor.
  • Perform a short fiber loopback test. If the fault cannot be located, replace the optical module or fiber.

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