Huawei NE05E Hardware Manual page 233

HUAWEI NE05E,NE08E
Hardware Guide
(2) Long-distance optical modules must be equipped with optical attenuators for
self-loops. For a 50GBase-ER (40 km) long-distance optical module, the receive
optical power damage threshold is lower than the average minimum transmit
optical power, making the module prone to damage caused by self-loops.
Therefore, the module must be equipped with an optical attenuator for self-loops.
(3) When optical path quality is tested using an OTDR, optical fibers must be
removed from the associated optical module. This is because the OTDR's transmit
optical power is far greater than the optical power damage threshold at the
receive end of an optical module.
2. Method of checking an optical path
Figure 3-76 Method of checking an optical path
3. Method of cleaning the end faces of an optical fiber
Before cleaning the end faces of an optical fiber that is in use, ensure that the
optical fiber has no optical signals. To achieve this, shut down the ports at both
ends of the fiber. Then, clean the end faces and insert the optical fiber back into
the corresponding port.
To clean the end faces of an optical fiber that is not in use, remove the dust-proof
cap from the fiber connector (or the patch cord connector of the involved optical
component), and put the dust-proof cap into a dedicated cleaning kit. After the
cleaning is complete, re-install the dust-proof cap.
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4. Precautions for using a lint-free wipe to clean the end face of an optical
fiber
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Issue 05 (2023-03-31)
Use the untouched part of a lint-free wipe to wipe the connector end face
along one direction.
If the end face of an optical fiber cannot be cleaned due to serious
contamination, use a lint-free wipe dipped with cleanser to wipe the end face
along one direction. Then, use a dry lint-free wipe to clean the end face.
Ensure that the end face is dry before using the optical fiber.
After the cleaning is complete, immediately install a dust-proof cap for any
optical fiber connector that is not in use.
Use a smooth surface of the lint-free wipe for cleaning.
Ensure that the optical fiber connector is vertical to the lint-free wipe during
cleaning.
Wipe the end face along the direction of the lint-free wipe's grain.
Wipe the end face along one direction only.
Any part of a lint-free wipe can be used only once, and a small piece of lint-
free wipe can be used to clean only one connector.
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