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Common Causes of Failures
Most problems in fiber links are caused by dirty,
scratched, or damaged connectors, as shown in Table 7-1.
Fault
Dirty end-faces
Poor polishing
Broken connectors
Mislabeling
Shattered end-faces
Bad splices
Excessive bends
Diagnosing Fiber Cabling Faults
Table 7-1. Causes of Failures in Fiber Links
Network Owners
80 %
72 %
40 %
8 %
34 %
36 %
6 %
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.
Chapter 7
Contractors
98 %
88 %
86 %
86 %
82 %
74 %
66 %
7-1
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