Installation Instructions

Installation
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I ssue 2 D RAFT 1 - en N okia Proprietary and C o n f idential
Note
5.6.4 Testing the fibre optic cables
Using a Power Meter, the power that arrives to the far end of
t
measured. This measurement is used to determine the total atte
n
fibre optic link.
Backscattering is the more complete method for fibre optic tra
characteristics diagnostics and for the anomaly entity and pos
determination. The instrument used is called the OTDR.
A periodic optic pulse sequence is injected into the fibre opt
instrument determines the retro-diffuse power percentage.
The instrument is used to:
• Measure the total attenuation
• Verify the attenuation trend along the fibre optic cable
a
concentrated loss points.
• Show the loss results on the reflectometric diagram as a p
o
variation.
If the measured optical connector attenuation is greater than
attenuation is greater than 0.1 dB, the connections should be
replaced.
Appendix B provides detailed information on how to test the fi
installation.
5.6.5 Cleaning the optical cables
Optical connectors are similar to eyeglass lenses and therefor
e
can be degraded by dust particles, finger grease and scratches
connector ferrule can be inspected by means of a microscope.
To clean the optical cables
1. Open the connectors.
Figure 20. SC/APC male connector