Cisco ONS 15454 SDH Specifications Page 112

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Cisco ONS 15454 SDH Troubleshooting and Maintenance Guide, R3.3
May 2002
Chapter 2 General Troubleshooting
Fiber and Cabling
2.5.2 Faulty Fiber-Optic Connections
Symptom A line card has multiple SONET alarms and/or signal errors.
Table 2-23 describes the potential cause(s) of the symptom and the solution(s).
Warning
Follow all directions and warning labels when working with optical fibers. To prevent eye
damage, never look directly into a fiber or connector. Class IIIb laser. Danger, laser radiation when
open. The OC-192 laser is off when the safety key is off (labeled 0). The laser is on when the card
is booted and the safety key is in the on position (labeled 1). The port does not have to be in service
for the laser to be on. Avoid direct exposure to the beam. Invisible radiation is emitted from the
aperture at the end of the fiber optic cable when connected, but not terminated.
Procedure: Verify Fiber-Optic Connections
Step 1 Ensure that a single-mode fiber connects to the ONS 15454 SDH STM-N card.
SM or SM fiber should be printed on the fiber span cable. ONS 15454 SDH STM-N cards do not use
multimode fiber.
Step 2 Ensure that the connector keys on the SC fiber connector are properly aligned and locked.
Table 2-22 Bit Errors Appear for a Line Card
Possible Problem Solution
Faulty cabling or low
optical-line levels.
Bit errors on line (traffic) cards usually originate from cabling problems or
low optical-line levels. The errors can be caused by synchronization
problems, especially if PJ (pointer justification) errors are reported. Moving
cards into different error-free slots will isolate the cause. Use a test set
whenever possible because the cause of the errors could be external cabling,
fiber, or external equipment connecting to the ONS 15454 SDH.
Troubleshoot cabling problems using the “Network Troubleshooting Tests”
section on page 2-1. Troubleshoot low optical levels using the “Faulty
Fiber-Optic Connections” section on page 2-32.
Table 2-23 Faulty Fiber-Optic Connections
Possible Problem Solution
Faulty fiber-optic
connections.
Faulty fiber-optic connections can be the source of SONET alarms and
signal errors. Refer to the “Verify Fiber-Optic Connections” section on
page 2-32.
Faulty gigabit interface
connectors.
Faulty gigabit interface converters can be the source of SONET alarms and
signal errors. Refer to the “Replace Faulty Gigabit Interface Converters”
section on page 2-34.
Faulty CAT-5 cables. Faulty CAT-5 cables can be the source of SONET alarms and signal errors.
Refer to the “Crimp Replacement CAT-5 Cables” section on page 2-36.
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