Cisco NCS 1010 and NCS 1020 Datapath Configuration Guide, IOS XR Releases 26.x.x

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Cisco NCS 1010 and NCS 1020 Datapath Configuration Guide, IOS XR Releases 26.x.x

Verify connection on an OTS interface between OLT nodes

Updated: June 19, 2026

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This procedure explains how to configure and use tone-pattern commands on the OTS controller to verify the optical transport system (OTS) interface connectivity between OLT nodes.

Verify the optical transport system (OTS) interface connectivity between OLT nodes using tone-pattern commands on the OTS controller.

Use this task when you need to confirm the physical or logical connectivity of OTS interfaces in your optical network. This verification helps ensure that links between OLT nodes and OTS controllers function correctly and can be confidently used for services or troubleshooting.

Follow these steps to check OTS interface connectivity on OLT nodes.

Before you begin

  • Ensure you have administrative access to the OLT device CLI.

  • Confirm that the OTS controller is properly installed and powered on.

  • Identify the correct OTS controller slot and port identifiers (for example, 0/0/0/2).

Procedure

1.

Start tone-pattern on OTS controller.

Example:

RP/0/RP0/CPU0:ios#tone-pattern controller ots 0/0/0/2 start
Wed May 25 11:59:51.040 UTC
Tone pattern started
2.

Start tone-pattern-detect on OTS controller on one side.

Example:

RP/0/RP0/CPU0:ios#tone-pattern-detect controller ots 0/0/0/2 start
Wed May 25 12:00:03.271 UTC
Tone pattern detect started
3.

Check for successful connection verification on the Line 2 OTS controller.

Example:

RP/0/RP0/CPU0:ios#show controllers ots 0/0/0/2 tone-info 
Wed May 25 12:00:11.393 UTC

Tone Info:

Tone Frequency : 191.1750000 THz

Tone Rate : 20 bits/second

Tone Pattern(Hex value) : abcd1234

Tone Pattern Expected(Hex value) : abcd1234

Tone Pattern Received(Hex value) : abcd1234

Tone Detected OOB :  Enabled

 Detection State: Success
4.

Stop the tone-pattern-detect on the OTS controller.

Example:

RP/0/RP0/CPU0:ios#tone-pattern-detect controller ots 0/0/0/2 stop
Wed May 25 12:00:56.540 UTC
Tone pattern detect stoped
5.

Stop the tone-pattern on the OTS controller.

Example:

RP/0/RP0/CPU0:ios#tone-pattern controller ots 0/0/0/2 stop
Wed May 25 12:01:04.226 UTC
Tone pattern stopped

OTS interface connectivity is verified.

What to do next

  • If the connection is not verified, review cabling and hardware status, then repeat the procedure as needed.

  • Document the status of the connection for operational records or further troubleshooting.