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Figure 23: Cleaning a receptacle with a cotton swab
5. If optical signals are lost during the operation of a device, use the preceding method to clean the
receptacle or the optical connector. In this manner, the possibility of contamination can be excluded.
1. Before using an optical time-domain reflectometer (OTDR) to test the connectivity or the attenuation of
optical signals, disconnect the optical fibers from the optical module. Otherwise, the optical module will be
burnt.
2. When performing a self-loop test, use an optical attenuator. Do not loosen the optical connector instead of
the optical attenuator.
• When cleaning a receptacle, insert the cotton swab and turn it slowly in the receptacle. Do not use
too much strength because the receptacle may be damaged.
2.3.4 Measures to Prevent an Optical Module from Being Burnt
2.3.5 Precautions
1. The optical connector should be vertically inserted in the receptacle to avoid damages to the receptacle.
2. Fibers must be inserted into optical modules of the corresponding type. That is, multimode fibers must be
inserted into multimode optical modules, and single mode fibers must be inserted into single mode optical
modules. If a fiber is inserted into an optical module of a different mode, faults may occur. For example, optical
signals will be lost.
Troubleshooting After Installation
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