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

Transmit shutdown

Updated: July 31, 2026

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This section explains the transmit shutdown feature on trunk optics controllers on the NCS 1004.

A transmit shutdown is a feature of trunk optics controllers that

  • reduces the CFP2 transmit power,

  • enables administrators to disable the laser transmitter for safety and maintenance, and

  • From Release 7.3.2 , you can configure transmit shutdown on the optics controller in the 4x100GE-MXP-DD muxponder mode.

You can configure transmit shutdown on the optics controller to disable the laser transmitter.

Configure transmit shutdown on trunk optics controller

Disable the CFP2 laser transmitter by configuring transmit shutdown on the trunk optics controller.
Follow these steps to configure and verify transmit shutdown on the trunk optics controller:

Procedure

1.

Run the transmit-shutdown command to perform transmit shutdown.

Example:


RP/0/RP0/CPU0:ios#configure
RP/0/RP0/CPU0:ios(config)#controller Optics R/S/I/P
RP/0/RP0/CPU0:ios(config-Optics)#transmit-shutdown
RP/0/RP0/CPU0:ios(config-Optics)#commit
RP/0/RP0/CPU0:ios(config-Optics)#exit
RP/0/RP0/CPU0:ios(config)#exit

Example:

This is a sample to perform transmit shutdown on the trunk port.


RP/0/RP0/CPU0:ios#configure
RP/0/RP0/CPU0:ios(config)#controller Optics 0/1/0/12
RP/0/RP0/CPU0:ios(config-Optics)#transmit-shutdown
RP/0/RP0/CPU0:ios(config-Optics)#commit
RP/0/RP0/CPU0:ios(config-Optics)#exit
RP/0/RP0/CPU0:ios(config)#exit

This is a sample to perform transmit shutdown on the trunk port in the 4x100GE-MXP.-DD muxponder mode.


RP/0/RP0/CPU0:ios#configure
RP/0/RP0/CPU0:ios(config)#controller Optics 0/1/0/9
RP/0/RP0/CPU0:ios(config-Optics)#transmit-shutdown
RP/0/RP0/CPU0:ios(config-Optics)#commit
RP/0/RP0/CPU0:ios(config-Optics)#exit
RP/0/RP0/CPU0:ios(config)#exit
2.

Run the show controllers optics command to verify the transmit shutdown state on the CFP2 DWDM trunk optics controller.

Example:


RP/0/RP0/CPU0:ios#sh controllers optics 0/1/0/12
Fri Feb 26 21:36:16.009 UTC
Controller State: Up
Transport Admin State: In Service
Laser State: Off
LED State: Yellow
Optics Status
Optics Type: CFP2 DWDM
DWDM carrier Info: C BAND, MSA ITU Channel=61, Frequency=193.10THz,
Wavelength=1552.524nm
Alarm Status:
-------------
Detected Alarms:
LOW-TX-PWR
LOS/LOL/Fault Status:
Alarm Statistics:
-------------
HIGH-RX-PWR = 0 LOW-RX-PWR = 1
HIGH-TX-PWR = 0 LOW-TX-PWR = 1
HIGH-LBC = 0 HIGH-DGD = 0
OOR-CD = 0 OSNR = 0
WVL-OOL = 0 MEA = 0
IMPROPER-REM = 0
TX-POWER-PROV-MISMATCH = 0
Laser Bias Current = 0.0 %
Actual TX Power = -40.00 dBm
RX Power = -1.02 dBm
RX Signal Power = -12.20 dBm
Frequency Offset = -8 MHz
Performance Monitoring: Enable
THRESHOLD VALUES
----------------

Parameter High Alarm Low Alarm High Warning Low Warning
------------------------ ---------- --------- ------------ -----------
Rx Power Threshold(dBm) 4.9 -12.0 0.0 0.0
Tx Power Threshold(dBm) 3.5 -10.1 0.0 0.0
LBC Threshold(mA) N/A N/A 0.00 0.00

LBC High Threshold = 98 %
Configured Tx Power = -1.50 dBm
Configured CD High Threshold = 180000 ps/nm
Configured CD lower Threshold = -180000 ps/nm
Configured OSNR lower Threshold = 0.00 dB
Configured DGD Higher Threshold = 180.00 ps
Baud Rate = 63.1394691467 GBd
Bits per Symbol = 4.0000000000 bits/symbol
Modulation Type: 16QAM
Chromatic Dispersion 0 ps/nm
Configured CD-MIN -26000 ps/nm CD-MAX 26000 ps/nm
Polarization Mode Dispersion = 0.0 ps
Second Order Polarization Mode Dispersion = 16.00 ps^2
Optical Signal to Noise Ratio = 35.90 dB
SNR = 17.00 dB
Polarization Dependent Loss = 0.70 dB
Polarization Change Rate = 0.00 rad/s
Differential Group Delay = 1.00 ps
Transceiver Vendor Details
Form Factor : CFP2
Name : CISCO-ACACIA
Part Number : 10-3500-01
Rev Number : 01
Serial Number : ACA24230026
PID : ONS-CFP2D-400G-C
VID : VES1
Date Code(yy/mm/dd) : 10/09/Í
Fiber Connector Type: LC
Otn Application Code: Not Set
Sonet Application Code: Not Set
Ethernet Compliance Code: Not set
Transceiver Temperature : 55 Celsius
AINS Soak : None
AINS Timer : 0h, 0m
AINS remaining time : 0 seconds


RP/0/RP0/CPU0:ios#show controller optics 0/1/0/9
Wed Sep 15 00:41:22.027 UTC
 Controller State: Up 
 Transport Admin State: In Service 
 Laser State: On 
 LED State: Green 
 
 Optics Status 
         Optics Type:  QSFP-DD DWDM
         DWDM carrier Info: C BAND, MSA ITU Channel=49, Frequency=193.70THz,
         Wavelength=1547.715nm 
         Alarm Status:
         -------------
         Detected Alarms: None
         LOS/LOL/Fault Status:
         Alarm Statistics:
          
         -------------
         HIGH-RX-PWR = 0            LOW-RX-PWR = 3          
         HIGH-TX-PWR = 0            LOW-TX-PWR = 5          
         HIGH-LBC = 0               HIGH-DGD = 0          
         OOR-CD = 0                 OSNR = 4          
         WVL-OOL = 0                MEA  = 0          
         IMPROPER-REM = 6          
         TX-POWER-PROV-MISMATCH = 0          
         Laser Bias Current = 0.0 %
         Actual TX Power = -11.10 dBm 
         RX Power = -11.56 dBm 
         RX Signal Power = -11.62 dBm 
         Frequency Offset = -66 MHz 
   Performance Monitoring: Enable 
         THRESHOLD VALUES
         ----------------
         Parameter                 High Alarm  Low Alarm  High Warning  Low Warning
         ------------------------  ----------  ---------  ------------  -----------
         Rx Power Threshold(dBm)          3.0      -24.5           0.0          0.0
         Tx Power Threshold(dBm)          0.0      -16.0           0.0          0.0
         LBC Threshold(mA)                N/A        N/A          0.00         0.00

         LBC High Threshold = 90 % 
         Configured Tx Power = -10.00 dBm 
         Configured CD High Threshold = 52000 ps/nm 
         Configured CD lower Threshold = -52000 ps/nm 
         Configured OSNR lower Threshold = 21.10 dB 
         Configured DGD Higher Threshold = 67.00 ps 
         Baud Rate =  60.1385467980 GBd
         Bits per Symbol = 4.0000000000  bits/symbol 
         Modulation Type: 16QAM 
         Chromatic Dispersion 0 ps/nm 
         Configured CD-MIN -13000 ps/nm  CD-MAX 13000 ps/nm 
         Polarization Mode Dispersion = 0.0 ps 
         Second Order Polarization Mode Dispersion = 24.00 ps^2 
         Optical Signal to Noise Ratio = 35.70 dB 
         SNR = 19.40 dB 
         Polarization Dependent Loss = 0.20 dB 
         Polarization Change Rate = 0.00 rad/s 
         Differential Group Delay = 1.00 ps 
 Transceiver Vendor Details
          
         Form Factor            : QSFP-DD
         Name                   : CISCO-ACACIA
         Part Number            : DP04QSDD-E
         Rev Number             : A
         Serial Number          : ACA2524006W
         PID                    : QDD-400G-ZRP-S
         VID                    : V01
         Date Code(yy/mm/dd)    : 21/06/18
         Fiber Connector Type: LC 
         Otn Application Code: Not Set 
         Sonet Application Code: Not Set 
         Ethernet Compliance Code: Not set 
 Transceiver Temperature : 62 Celsius
 AINS Soak                : None 
 AINS Timer               : 0h, 0m

Verify transmit shutdown on trunk optics controller

Procedure

1.

Verify the transmit shutdown state on the CFP2 DWDM trunk optics controller using the show controllers optics command.

RP/0/RP0/CPU0:ios#show controllers optics 0/1/0/12
Fri Feb 26 21:36:16.009 UTC

Controller State: Up
Transport Admin State: In Service
Laser State: Off
LED State: Yellow

Optics Status
Optics Type: CFP2 DWDM
...
Detected Alarms:
LOW-TX-PWR
...
Actual TX Power = -40.00 dBm
2.

(Optional) For the 4x100GE-MXP-DD muxponder mode (from Release 7.3.2), verify the transmit shutdown state on the QDD ZRP optics controller.

RP/0/RP0/CPU0:ios#show controller optics 0/1/0/9
Wed Sep 15 00:41:22.027 UTC

 Controller State: Up
 Transport Admin State: In Service
 Laser State: On
 LED State: Green
 Optics Status
         Optics Type: QSFP-DD DWDM
         DWDM carrier Info: C BAND, MSA ITU Channel=49, Frequency=193.70THz,
         Wavelength=1547.715nm
         Alarm Status:
         -------------
         Detected Alarms: None
         Actual TX Power = -11.10 dBm
         RX Power = -11.56 dBm

When transmit shutdown is active, the Laser State shows Off and the LOW-TX-PWR alarm is present in the output.