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

PDF

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

Configure chromatic dispersion

Updated: June 18, 2026

Want to summarize with AI?

Log in

Use this procedure to configure chromatic dispersion on optics controllers for 1.2T, 2.4T, and 2.4TX cards.

Use this task to configure chromatic dispersion on optics controllers of 1.2T, 2.4TX, and 2.4T cards.

When you configure the maximum and minimum values for chromatic dispersion for any data rate, ensure the minimum difference between the configured values is equal to or greater than 1500 ps/nm.

This table lists the default CD search range for a 1.2T card.

Data rate

BPS

Card support

Default CD search range

200G to 500G

BPS < = 3

1.2T, 1.2TL

-10,000 to 100,000 ps/nm

3 < BPS <= 4

1.2T, 1.2TL

-10,000 to 80,000 ps/nm

4 < BPS <=5

1.2T

-5,000 to 20,000 ps/nm

600G

BPS=5.2578125

1.2T

-2000 to 2,000 ps/nm

This table lists the default CD search range for 2.4T, 2.4TX, cards.

Line rate Symbol rate (up to)
138GBd 128GBd 118GBd 108GBd 98GBd 88GBd 78GBd 68GBd
1200G 4000 to -5000 4000 to -5000

—

—

—

—

—

—
1000G 20000 to -5000 20000 to -5000 20000 to -5000

—

—

—

—

—
800G 48000 to -10000 48000 to -10000 48000 to -10000

35000 to -10000

35000 to -10000

—

—

—
600G 74000 to -10000 74000 to -10000 74000 to -10000 60000 to -10000 60000 to -10000 60000 to -10000 48000 to -10000 48000 to -10000
500G 90000 to -10000 90000 to -10000 90000 to -10000 72000 to -10000 72000 to -10000 72000 to -10000 58000 to -10000 58000 to -10000
400G

—

 90000 to -10000 90000 to -10000 72000 to -10000 72000 to -10000 72000 to -10000 58000 to -10000 58000 to -10000
Note

The cd-min and cd-max values must be set for BPS values that are greater than 4 in the 1.2T card.

Note

When the user provisions the cd-min and cd-max values that are outside the range through CLI, the provisioned values are accepted; however, only the actual values supported by the hardware are applied.

Procedure

1.

Enter the controller optics command in the global configuration mode.

Example:

This is a sample where chromatic dispersion is configured on the optics controller.


RP/0/RP0/CPU0:ios#configure
Mon Aug 19 19:31:42.115 UTC
RP/0/RP0/CPU0:ios(config)#controller  optics 0/1/0/1
RP/0/RP0/CPU0:ios(config-Optics)#cd-max 4000
RP/0/RP0/CPU0:ios(config-Optics)#cd-min -1000
RP/0/RP0/CPU0:ios(config-Optics)#commit
Mon Aug 19 19:35:24.697 UTC
RP/0/RP0/CPU0:ios(config-Optics)#exit
RP/0/RP0/CPU0:ios(config)#exit

RP/0/RP0/CPU0:ios#show run controller optics 0/1/0/*
Mon Aug 19 19:57:41.859 UTC
controller Optics0/1/0/0
 transmit-power -15
 dwdm-carrier 50GHz-grid itu-ch 55
 enh-sop-tol-mode 1
 cross-pol-gain-mode 10
 lbc-high-threshold 5
!
controller Optics0/1/0/1
 description trunk power UP
 cd-min -1000
 cd-max 4000
 enh-colorless-mode 2
 enh-sop-tol-mode 3
 nleq-comp-mode 4
 cross-pol-gain-mode 2
 cross-pol-weight-mode 3
 cpr-win-mode 3
 cpr-ext-win-mode 8
 rx-voa fixed-ratio 1200
 filter-roll-off-factor 0.035
!
controller Optics0/1/0/5
 soak-time 10
!
2.

Run the commit command to apply the changes.

Configure chromatic dispersion threshold

Use this task to configure the minimum and maximum acceptable chromatic dispersion for the trunk optics controllers.

The CD alarm is raised if the chromatic dispersion goes below the minimum or exceeds the maximum value.

Procedure

1.

Enter the controller opticsR/S/I/Pcd-high-thresholdcd-highcd-low-thresholdcd-low command in the global configuration mode to configure the minimum and maximum chromatic dispersion threshold.

Example:

This sample configures the maximum and minimum acceptable CD on the controller optics:


RP/0/RP0/CPU0:ios#configure
RP/0/RP0/CPU0:ios(config)#controller optics 0/0/0/7
RP/0/RP0/CPU0:ios(config-Optics)#cd-high-threshold 2400
RP/0/RP0/CPU0:ios(config-Optics)#cd-low-threshold -2400
RP/0/RP0/CPU0:ios(config-Optics)#commit

This sample shows the maximum and minimum acceptable CD configured on the controller optics:


RP/0/RP0/CPU0:ios#show controllers optics 0/0/0/7
Fri Nov 12 10:58:50.595 UTC
Controller State: Up
Transport Admin State: In Service
Laser State: On
LED State: Yellow
Optics Status
         Optics Type:  CIM8 DWDM
         DWDM carrier Info: C BAND, MSA ITU Channel=61, Frequency=193.10THz,
         Wavelength=1552.524nm

         Alarm Status:
         -------------
         Detected Alarms:
                 HIGH-RX-PWR   LOW-TX-PWR
                 HIGH-DGD

         LOS/LOL/Fault Status:

         Alarm Statistics:

         -------------
         HIGH-RX-PWR = 1            LOW-RX-PWR = 0
         HIGH-TX-PWR = 0            LOW-TX-PWR = 1
         HIGH-LBC = 0               HIGH-DGD = 6
         OOR-CD = 0                 OSNR = 0
         WVL-OOL = 0                MEA  = 0
         IMPROPER-REM = 1
         TX-POWER-PROV-MISMATCH = 0
         Laser Bias Current = 0.0 %
         Actual TX Power = 0.97 dBm
         RX Power = -0.53 dBm
         RX Signal Power = -1.20 dBm
         Frequency Offset = 63 MHz

         Performance Monitoring: Enable

         THRESHOLD VALUES
         ----------------

         Parameter                 High Alarm  Low Alarm  High Warning  Low Warning
         ------------------------  ----------  ---------  ------------  -----------
         Rx Power Threshold(dBm)         -2.0       -3.0           0.0          0.0
         Tx Power Threshold(dBm)          4.0        2.0           0.0          0.0
         LBC Threshold(mA)                N/A        N/A          0.00         0.00

         LBC High Threshold = 55 %
         Configured Tx Power = 1.00 dBm
         Configured CD High Threshold = 2400 ps/nm
         Configured CD lower Threshold = -2400 ps/nm
         Configured OSNR lower Threshold = 0.40 dB
         Configured DGD Higher Threshold = 0.30 ps
         Baud Rate =  63.1394679230 GBd
         Bits per Symbol = 3.0000000000  bits/symbol
         Modulation Type: 8QAM
         Chromatic Dispersion 0 ps/nm
         Configured CD-MIN -48000 ps/nm  CD-MAX 48000 ps/nm
         Polarization Mode Dispersion = 0.0 ps
         Second Order Polarization Mode Dispersion = 29.00 ps^2
         Optical Signal to Noise Ratio = 36.10 dB
         SNR = 17.50 dB
         Polarization Dependent Loss = 0.50 dB
         Polarization Change Rate = 0.00 rad/s
         Differential Group Delay = 1.00 ps

Transceiver Vendor Details

         Form Factor            : CIM8
         Name                   : CISCO-ACACIA
         Part Number            : 10-3500-01
         Rev Number             : 01
         Serial Number          : ACA24480037
         PID                    : CIM8-C-K9
         VID                    : VES1
         Date Code(yy/mm/dd)    : 23/11/10
         Fiber Connector Type: LC
         Otn Application Code: Not Set
         Sonet Application Code: Not Set
         Ethernet Compliance Code: Not set

Transceiver Temperature : 46 Celsius
AINS Soak                : None
AINS Timer               : 0h, 0m
AINS remaining time      : 0 seconds
2.

Run the commit command to apply the changes.