7-1
Chapter 7
Diagnosing Fiber Cabling Faults
Common Causes of Failures
Most problems in fiber links are caused by dirty,
scratched, or damaged connectors, as shown in Table 7-1.
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 7-1. Causes of Failures in Fiber Links
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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