Cisco 15310-MA Guide de dépannage télécharger pdf (Page 261)

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Cisco ONS 15310-CL and Cisco ONS 15310-MA Troubleshooting Guide, Release 9.0

78-18394-01

Chapter 2 Alarm Troubleshooting

Alarm Procedures

Warning

Invisible laser radiation could be emitted from the end of the unterminated fiber cable or connector.

Do not stare into the beam 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 could pose an eye hazard.

Statement 1056

Warning

Use of controls, adjustments, or performing procedures other than those specified could result in

hazardous radiation exposure.

Statement 1057

Note Some levels of BER errors (such as 1E–9 dBm) take a long period of time to raise or clear, about

9,000 seconds, or 150 minutes. If the SD threshold is provisioned at 1E–9 dBm rate, the SD alarm needs

at least one and one-half hours to raise and then another period at least as long to clear.

Note The recommended test set for use on all SONET ONS electrical ports is the Omniber 718.

Clear the SD (DS1, DS3) Condition

Step 1 Complete the “Clear a DS-3 or DS-1 Port Loopback Circuit” procedure on page 2-165.

Caution Always use the supplied electrostatic discharge wristband when working with a powered ONS 15310-CL

or ONS 15310-MA.

Step 2 Ensure that the fiber connector for the port is completely plugged in. For more information about cable

connections, refer to the “Install Hardware” chapter in the Cisco ONS 15310-CL and

Cisco ONS 15310-MA Procedure Guide.

Step 3 If the BER threshold is correct and at the expected level, use a test set to measure the power level of the

line to ensure it is within guidelines. For specific procedures to use the test set equipment, consult the

manufacturer.

Step 4 If the power level is good, verify that receive levels are within the acceptable range. The correct

specifications are listed in the “Install Hardware” chapter in the Cisco ONS 15310-CL and

Cisco ONS 15310-MA Procedure Guide.

Step 5 If receive levels are good, clean the fibers at both ends according to site practice. If no site practice exists,

complete the procedure in the “Maintain the Node” chapter in the Cisco ONS 15310-CL and

Cisco ONS 15310-MA Procedure Guide.

Step 6 If the condition does not clear, verify that single-mode fiber is used.

Step 7 If the fiber is of the correct type, verify that a single-mode laser is used at the far-end node.

Step 8 Clean the fiber connectors at both ends for a signal degrade according to site practice. If no practice

exists, use the procedure in the “Maintain the Node” chapter in the Cisco ONS 15310-CL and

Cisco ONS 15310-MA Procedure Guide.

Step 9 If the problem does not clear, the transmitter at the other end of the optical line could be failing and

require replacement.

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Cisco 15310-MA Guide de dépannage Page 261