Configuration Guide for Cisco Optical Site Manager, IOS XR Release 26.x.x

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Configuration Guide for Cisco Optical Site Manager, IOS XR Release 26.x.x

Provision FEC thresholds

Updated: October 14, 2026

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Use this procedure to provision FEC thresholds. This task helps you complete the required configuration, verification, or management action in Cisco Optical Site Manager.

Define limits for Forward Error Correction (FEC) performance parameters that trigger threshold crossing alerts (TCAs) or alarms. FEC uses Reed-Solomon RS (255,239) encoding to correct and detect errors on optical links, improving signal quality and reducing the need for signal regeneration.

Provisioning FEC thresholds involves setting performance monitoring (PM) threshold values for FEC parameters on optical cards such as transponders or muxponders. These thresholds apply to key FEC metrics, such as BIT-EC and UNC-WORDS. The metrics are measured during these specified monitoring intervals:

  • fifteen minutes

  • one day

Before you begin

Follow these steps to configure the FEC thresholds for the card.

Procedure

  1. Click the Provisioning tab.

  2. Click the FEC Thresholds section to expand it.

  3. Select the value for the FEC PMs and click Apply.

    You can set the FEC thresholds for fifteen minutes or one day intervals.

  4. Select a performance monitoring type from the options in this table.

    PM type

    Description

    BIT-EC

    Sets the value for bit errors corrected.

    UNC-WORDS

    Sets the value for uncorrectable words.

The system continuously monitors the FEC parameters against these thresholds. When the number of corrected bit errors or uncorrectable words exceeds the configured limits within the selected interval, alerts are generated.