Configuration Guide for Cisco NCS 1014, IOS XR Releases 26.x.x

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Configure OTDR

Updated: June 18, 2026

Provides an overview of OTDR (Optical Time-Domain Reflectometer) configuration steps, including scan parameter setup, measurement verification, and automatic scan modes, to ensure accurate fiber network testing and troubleshooting.

Table 1. Feature History

Feature Name

Release Information

Feature Description

OTDR enhancements

Cisco IOS XR Release 25.4.1

These functionality enhancements have been implemented on the ONS-QSFP-OTDR pluggable of the EDFA2 card:

  • OTDR results now include total measured loss and total measured length alongside existing results such as scan sirection, scan status, optical return loss, SOR file, total events detected, and the events.

  • Unique names can be assigned to SOR files for easier identification.

  • SOR files from automatic and manual OTDR scans are organized into separate folders to differentiate between file types.

CLI:

The keyword label string is added to the command otdr-start controller ots R/S/I/P direction.

    ONS-QSFP-OTDR pluggables

    This section explains the function, key attributes, and operational details of ONS-QSFP-OTDR pluggables for fiber network assessment.

    Automatic bidirectional OTDR scan

    This section explains how automatic bidirectional OTDR scans identify fiber faults and locate issues by triggering scans in both directions during key network events.

    OTDR scan status

    This section lists and explains all possible OTDR scan status.

    OTDR baseline

    This section explains what an OTDR baseline is, its key attributes, and its role in maintaining and troubleshooting optical networks.