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

Provision OTU interfaces

Updated: October 14, 2026

Want to summarize with AI?

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

Configure OTU (Optical Transport Unit) interfaces on optical line cards to manage forward error correction, synchronization, and interoperability, as well as related settings.

Use this task to adjust OTU parameters such as HD FEC mode, interoperability with non-native equipment, synchronization support, and administrative synchronization status message settings for optimal network performance and compatibility.

Before you begin

Follow these steps to modify the OTU settings of the card.

Procedure

Click the Provisioning tab.
Click the OTU Interfaces section to expand it.

Modify the required settings described in the Table 1 table.

Table 1. OTU Interface Settings
Parameter	Description	Options
Port	(Display only) Displays the port name.	—
Description	Displays the description of the port.	—
HD FEC	Sets the OTN lines to forward error correction (FEC).	DISABLE_FEC EFEC EFEC_14 EFEC_17 HG_FEC_20 HG_FEC_7 STANDARD_FEC
Interop Mode	Enables interoperability between line cards and other vendor interfaces.	InteropNone InteropEnable
Supports Sync	(Display only) Displays the SupportsSync card parameter. If the value is true, the card functions as a NE timing reference.	true false
Sync Msg In	Sets the EnableSync card parameter. Enables synchronization status messages (S1 byte), which allow the node to choose the best timing source.	true false
Admin SSM In	Overrides the synchronization status message (SSM) and the synchronization traceability unknown (STU) value. If the node does not receive an SSM signal, the system uses the STU value.	G811 STU G812T G812L SETS DUS PRS ST2 ST3E ST3 SMC ST4 RES STU_SDH DUS_SDH SSM_FAILED RES_SDH TNC
Rate	Displays the rate.	—
Service State	Displays the service state.	—

Click Apply.

The system saves your changes, and the modified OTU settings are displayed for the selected card.

Need help?

Open a support case

(Requires a Cisco Service Contract)

The documentation set for this product strives to use bias-free language. For the purposes of this documentation set, bias-free is defined as language that does not imply discrimination based on age, disability, gender, racial identity, ethnic identity, sexual orientation, socioeconomic status, and intersectionality. Exceptions may be present in the documentation due to language that is hardcoded in the user interfaces of the product software, language used based on RFP documentation, or language that is used by a referenced third-party product. Learn more about how Cisco is using Inclusive Language.