A slide from a Sumitomo Electric presentation Studies of Historical Cable/Fiber Failure Causes, Reported Failures, % Dig-ups, 172, 57% Craft/Workman Errors, 22, 7% Rodent, 13, 4% Fire, 11, 4% Vehicles, 11, 4% Defective Cable, 8, 3% Firearms, 7, 2% Intrinsic Electronics Failures, 6, 2% Flood, 6, 2% Lightning, 4, 1% Extreme Temperature, 3, 1% Ice, 3, 1% Steam Damage, 3, 1% Other, 15, 5% Unknown, 16, 5% Total, 300, 100% Ref: V. Hou, “Update on Interim Results of Fiber Optic System Field Failure Analysis”, NFOEC Proceedings Vol. 1, p. 539-545, (1991)
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