Configuration Guide for Cisco NCS 1004, IOS XR Release 25.x.x

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Configuration Guide for Cisco NCS 1004, IOS XR Release 25.x.x

Frequency configurations

Updated: July 31, 2026

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This section explains how frequency configurations enable control of optical frequencies and grid spacing for NCS 1004 line cards.

A frequency configuration is a feature that

  • enables users to set the optical frequency on trunk ports of NCS 1004 line cards,

  • supports specific frequency ranges and grid spacing depending on the line card model, and

  • allows precise wavelength control in the optical network.

Frequency range and grid spacing by line card

You can configure the frequency on trunk ports of the line card. This table lists the frequency range and grid spacing supported on each line card.

Table 1. Frequency range and grid spacing by line card

Line card

Frequency range (THz)

Default frequency (THz)

Grid spacing

1.2T

191.25 to 196.1

193.1

50GHz and 100MHz

1.2TL

1

186.1 to 190.85

188.5

100MHz

OTN-XP CFP2 trunk

191.275 to 196.125

193.1

50GHz and 100MHz

OTN-XP QDD ZRP

191.275 to 196.125

193.70

6.25GHz, 50GHz, and 100MHz

2-QDD-C

191.15 to 196.1

193.1

50GHz and 100MHz

QXP

191.275 to 196.125

193.7

50GHz and 100MHz
1 Only non-ITU channels are supported

Configure trunk port frequency

Set the appropriate DWDM frequency on trunk ports of transponder line cards to match network requirements.

Follow these steps to configure the trunk port frequency:

Procedure

1.

Run the configure controller optics dwdm-carrier{100MHz-grid frequency frequency} | {50GHz-grid [frequency frequency} command to configure the wavelength.
2.

Run the commit command to save and apply the configuration changes.

The DWDM frequency is configured on the trunk port.

Change the trunk port frequency on a transponder card

Use this task when you need to modify the optical signal frequency on the trunk port.

Follow these steps to configure the trunk port frequency:

Procedure

1.

Run the shutdown command in optics configuration mode to shutdown the trunk port.

Example:


RP/0/RP0/CPU0:ios(config)#controller optics 0/2/0/0
RP/0/RP0/CPU0:ios(config-Optics)#shutdown 
RP/0/RP0/CPU0:ios(config-Optics)#commit 
Fri Jul 11 07:19:30.624 UTC
RP/0/RP0/CPU0:ios(config-Optics)#
The interface at trunk port 0 is shut down.
2.

Run the dwdm-carrier 100MHz-grid frequency <frequency> command to set the new frequency.

Example:

RP/0/RP0/CPU0:ios(config-Optics)#dwdm-carrier 100MHz-grid frequency 1911500
Fri Jul 11 07:20:17.234 UTC
WARNING! Changing channel/wavelength/frequency can impact traffic
RP/0/RP0/CPU0:ios(config-Optics)#commit 
Fri Jul 11 07:20:19.905 UTC
RP/0/RP0/CPU0:ios(config-Optics)#
Note

Changing the trunk port frequency can impact traffic.

The frequency for the 100 MHz grid channel is set to 1911500.
3.

Run the no shutdown command in optics configuration mode to bring the port back up.

Example:

RP/0/RP0/CPU0:ios(config-Optics)#no shutdown 
RP/0/RP0/CPU0:ios(config-Optics)#commit      
Fri Jul 11 07:20:57.198 UTC
RP/0/RP0/CPU0:ios(config-Optics)#
Note

If you configure the frequency and use the no shutdown command in the same batch, the no shutdown command is processed first, followed by the new frequency. This means the trunk interface transmits at the previous frequency for a shorter time.

The channel resumes operation at the new frequency.

The channel on the trunk port now operates at the configured frequency.