if you haven't already done it, use a scope to check every connector in the line, including the transmitter and receiver. Cleaning a connector without a scope is like cleaning a window in the dark.
I've also seen bad/contaminated splices or kinked fibers in a closure cause it. Test the fiber with an OTDR, using multiple wavelengths if possible. Calculate link-length losses and compare with measured losses. Look for losses that shouldn't be there
Re: Fiber-BER/DQI issues
Member #: 19319
Registered: 1996-2001
Posted:
143
Name:
Lorne
Company:
major MSO (3rd namechange in 5 years)
Occupation:
Lead System Tech
Location:
Virginia
Personal:
60-ish
Experience:
~31 years
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