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Chapter 15: Diagnose Problems in
Fiber Links
Common Causes of Problems in Fiber Links
Most problems in fiber links are caused by dirty, scratched, or
damaged connectors, as shown in Table 18.
The table shows results of a survey of 89 contractors and private
network owners. The results show what percentage of each
group commonly found the faults listed.
Table 18. Causes of Failures in Fiber Links
Fault
Percentage of the Group that Commonly Finds
the Fault
Network Owners Contractors
Dirty end faces 80 % 98 %
Poor polishing 72 % 88 %
Broken connectors 40 % 86 %
Mislabeling 8 % 86 %
Shattered end faces 34 % 82 %
Bad splices 36 % 74 %
Excessive bends 6 % 66 %
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