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Cisco ONS 15327 Troubleshooting Guide, R3.4
April 2003
Chapter1 General Troubleshooting
Fiber and Cabling
1.8.2 Faulty Fiber-Optic Connections
Symptom A line card has multiple SONET alarms and/or signal errors.
Table 1 -36 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.
Warning
Class IIIb laser.
Warning
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.
Warning
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 15327 card.
SM or SM Fiber should be printed on the fiber span cable. ONS15327 cards do not use multimode fiber.
Step 2 Ensure that the connector keys on the SC fiber connector are properly aligned and locked.
Step 3 Check that the single-mode fiber power level is within the specified range:
a. Remove the Rx end of the suspect fiber.
b. Connect the receive end of the suspect fiber to a fiber-optic power meter, such as a
GN Nettest LP-5000.
Table1-36 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. See the “Verify Fiber-Optic Connections” procedure on
page1-72.
Faulty Category-5
cables. Faulty Category-5 cables can be the source of SONET alarms and signal
errors. See the “1.8.2.1Crimp Replacement LAN Cables” section on
page1-74.
Faulty gigabit interface
connectors. Faulty gigabit interface converters can be the source of SONET alarms and
signal errors. See the “1.8.2.2 Replace Faulty SFP Connectors” section on
page1-76.