Cisco 15310-MA Instrukcja Naprawy Pobierz pdf (Strona 236)

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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

2.7.154 LOS (OCN)

Default Severity: Critical (CR), Service-Affecting (SA)

SONET Logical Object: OCN

An LOS alarm on an OC-3 or OC-12 port occurs when a SONET receiver detects an all-zero pattern for

10 microseconds or longer. An LOS alarm means the upstream transmitter has failed. If an OC-3 or

OC-12 LOS alarm is not accompanied by additional alarms, a fiber break is usually the cause of the

alarm. It clears when two consecutive valid frames are received.

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 If a circuit shows a partial status when this alarm is raised, the logical circuit is in place. The circuit is

able to carry traffic when the connection issue is resolved. You do not need to delete the circuit when

troubleshooting this alarm.

Clear the LOS (OCN) Alarm

Step 1 Using site practices, verify fiber continuity to the port.

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

or ONS 15310-MA.

Step 2 If the cabling is good, verify that the correct port is in service by completing the following steps:

a. Confirm that the green ACT LED is on.

b. To determine whether the OC-3 or OC-12 port is in service, double-click the controller card

(15310-CL-CTX or CTX2500 card) in CTC to display the card view.

c. Click the Provisioning > Optical > Line tabs.

d. Verify that the Admin State column lists the port as IS.

e. If the Admin State column lists the port as OOS,MT or OOS,DSBLD, click the column and choose

IS. Click Apply.

Note If ports managed into IS administrative state are not receiving signals, the LOS alarm is

either raised or remains, and the port service state transitions to OOS-AU,FLT.

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