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

AppSel Code Provisioning

Updated: September 23, 2026

Explains the fundamentals and attributes of application select code provisions in optical modules.

This chapter introduces Application Select (AppSel) code provisioning, a key feature for configuring the operating modes of optical modules. It details the benefits, operational mechanisms, and configuration steps for AppSel code provisioning.

Table 1. Feature History
Feature Name	Release Information	Feature Description
Additional AppSel code support for 400G ULH pluggables on the QXP card	Cisco IOS XR Release 26.3.1	The QXP card now supports additional application select (AppSel) codes for the DP04QSDD-ULH-A1 pluggable. You can select AppSel codes 3, 6, 9, 12, 15, 16, 18, 19, 21, 24, and 29. This enhancement expands the available host-interface, baud-rate, modulation, and chromatic-dispersion combinations, giving you greater flexibility to optimize capacity and reach without changing the existing AppSel provisioning workflow.
Application select code provisioning for QXP card	Cisco IOS XR Release 25.3.1	You can now configure and select application codes directly on a QSFP-DD module connected to a QXP-K9 card using the CLI. The pluggable modules supported is DP04QSDD-ULH-A1. This enhancement simplifies provisioning by allowing you to choose from advertised application modes such as 400ZR, OpenZR+, and others directly through the interface. Once selected, the host device activates the appropriate code, ensuring compatibility and streamlining configuration. The appsel simple code keyword is introduced in the controller optics command. The appsel detailed , appsel advertised , and appsel active keywords are introduced in the show controller optics command.

Application select code provisioning

This section explains the purpose, structure, and operational context of application select codes (AppSel codes) for QDD optical modules.

Configure an AppSel code on an optical module

Use this procedure to configure an AppSel code to enable the optical module to operate in a specific application mode, such as 400ZR or OpenZR+.

Supported AppSel codes for 400G ULH pluggables on the QXP card

This section provides host-interface and trunk parameters for additional AppSel codes supported by the DP04QSDD-ULH-A1 pluggable on the QXP card.

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