1-70
Cisco ONS 15600 SDH Troubleshooting Guide, R8.0
July 2010
Chapter 1 General Troubleshooting
1.9.1 Bit Errors Appear for an Optical Traffic Card
1.9.1 Bit Errors Appear for an Optical Traffic Card
Symptom
An optical traffic card has multiple bit errors.
describes the potential causes of the symptom and the solutions.
1.9.2 Faulty Fiber-Optic Connections
Symptom
An optical (STM-N) card has multiple SDH alarms or signal errors.
describes the potential cause of the symptom and the solution.
Warning
Invisible laser radiation may be emitted from disconnected fibers or connectors. Do not stare into
beams or view directly with optical instruments.
Statement 1051
Warning
Invisible laser radiation may be emitted from the end of the unterminated fiber cable or connector. Do
not view directly with optical instruments. Viewing the laser output with certain optical instruments
(for example, eye loupes, magnifiers, and microscopes) within a distance of 100 mm may pose an eye
hazard.
Statement 1056
Verify Fiber-Optic Connections
Step 1
Ensure that a single-mode fiber connects the ONS 15600 SDH optical (STM-N) port(s).
SM or SM Fiber should be printed on the fiber span cable. ONS 15600 SDH optical (STM-N) cards do
not use multimode fiber.
Table 1-23
Bit Errors Appear for a Traffic Card
Possible Problem
Solution
Faulty cabling
Low optical-line power
High optical-line power
Bit errors on line (traffic) ports usually originate from cabling problems or
low or high optical-line power levels. The errors can be caused by
synchronization problems, especially if PJ (pointer justification) errors are
reported. Troubleshoot cabling problems using the
Troubleshooting Tests” section on page 1-2
. Troubleshoot low or high
optical-line power levels using the
“1.9.2 Faulty Fiber-Optic Connections”
. Use a test set whenever possible to check for errors.
Table 1-24
Faulty Fiber-Optic Connections
Possible Problem
Solution
Faulty fiber-optic
connections to the
optical (STM-N) card
Faulty fiber-optic connections can be the source of SDH alarms and signal
errors. See the
“Verify Fiber-Optic Connections” procedure on page 1-70
.
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