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This may be caused by the following reasons:

• Damaged or dirty fiber connected to the local receiver

• The received power may not be within the acceptable range on local port input

• The input optical signal is severely degraded by the optical noise

Severity

Service affecting?

Applicability

Corrective Action

This procedure details the corrective action for a DEG against the OT port. At the end of

each step wait to see if the fault clears. If not, continue with the next step.

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Clean the input fiber at the receiver, and check if the input power is within the specified

range.

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If it does not clear the alarm, check if there is any power management or optical channel

alarm reported on the link. Perform the corrective action for clearing these alarms on the

link.

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Measure the optical signal noise ratio (OSNR) with at the received amplifier with an

optical spectrum analyzer. Check if the OSNR is within the range specified by the EPT.

Perform the actions to improve the system OSNR.

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For 40G and 100G coherent cards only: Retrieve the monitoring values for chromatic

dispersion (CD), Differential Group Delay (DGD), and Frequency offset. Check if the

values are in the normal range. If not, perform the actions to optimize the optical link.

N D

O F

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DISCOVERMOD