Optics and Hardware Configuration Guide for Cisco 8000 Series Routers, Cisco IOS XR Releases

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Optics and Hardware Configuration Guide for Cisco 8000 Series Routers, Cisco IOS XR Releases

Display of alarms for coherent optical transceivers

Updated: June 16, 2026

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Introduces display of alarms for coherent optical transceivers and explains the core idea and technical context. Highlights the main characteristics and usage guidance needed before configuration.

Alarms are raised when the optical transceiver malfunctions.

  • TX loss of alignment - indicates loss of signal alignment on the transmitter.

  • TX out of alignment - indicates that the signal on the transmitter (TX) is out of alignment.

  • TX CMU loss of lock - indicates that the transmitter (TX) has lost connection (locked) with the external clock (clock monitor unit).

  • TX reference clock loss of lock - indicates that the transmitter (TX) has lost connection (locked) with the reference clock.

  • TX deskew loss of lock - for traffic flow in the TX direction, this alarm indicates that the end receiver cannot align the physical lanes using alignment marker.

  • TX FIFO error - indicates signal FIFO error on the transmitter.

  • RX demodulator loss of lock - indicates that the media demodultor cannot achieve lock.

  • RX CDC loss of lock - indicates that the receiver (RX) has lost connection (locked) with the external clock.

  • RX loss of alignment - indicates that the signal alignment on the receiver (RX) is lost.

Continue with these items:

  • RX out of alignment - indicates that the signal on the receiver (RX) is out of alignment.

  • RX deskew loss of lock - for traffic flow in the RX direction, this alarm indicates that the end receiver cannot align the physical lanes using alignment marker.

  • RX FIFO error - indicates signal FIFO error on the receiver.

  • RX FEC excessive degrade - indicates that the signal has reached or exceeded FED threshold.

  • RX FEC detected degrade - indicates that the signal has reached or exceeded FDD threshold.

  • Remote degrade - indicates remote signal degradation.

  • Local degrade - indicates local signal degradation.

  • Remote Phy fault - indicates remote signal fault (RPF).

Table 1. Feature History Table

Feature Name

Release Information

Description

View Coherent Optical Transceiver Module Parameters

Release 25.4.1

Introduced in this release on: Fixed Systems (8010 [ASIC: A100])(select variants only*)

*This feature is supported on:

  • 8011-32Y8L2H2FH

  • 8011-12G12X4Y-A/D

View Additional Alarms for Coherent Optical Transceiver

Release 25.1.1

Introduced in this release on: Fixed Systems (8700 [ASIC: K100], 8010 [ASIC: A100])(select variants only*)

*This feature is supported on:

  • 8712-MOD-M

  • 8011-4G24Y4H-I

View Additional Alarms for Coherent Optical Transceiver

Release 24.4.1

Introduced in this release on: Fixed Systems (8200 [ASIC: P100], 8700 [ASIC: P100])(select variants only*); Modular Systems (8800 [LC ASIC: P100])(select variants only*)

*This feature is now supported on:

  • 8212-48FH-M

  • 8711-32FH-M

  • 88-LC1-12TH24FH-E

  • 88-LC1-36EH

  • 88-LC1-52Y8H-EM

View Additional Alarms for Coherent Optical Transceiver

Release 24.1.1

 You can now monitor the optical transceivers for proper functioning and identify the cause of any malfunction. This is made possible because the output of the show alarms command is now enhanced to display the additional media lane alarms for coherent optical transceivers.

The media lane alarms are now reported in the show alarms command:

Restrictions for displaying optical transceiver alarms

The optical transceivers may not display the alarms if:

  • The optical transceiver is disabled and the optical transceiver is in the secondary admin-state maintenance mode.

  • Higher priority alarms such as improper removal and loss of signal (LOS) are reported. In such instances, these alarms can be viewed using the show alarms brief suppressed command.

Verify alarms for coherent optical transceivers

Follow this task to verify alarms for coherent optical transceivers.

Procedure

SUMMARY STEPS

  1. The show alarms command displays the alarms for the coherent optical transceivers.

DETAILED STEPS

The show alarms command displays the alarms for the coherent optical transceivers.

Example:

Router#show alarms brief system active

------------------------------------------------------------------------------------
Active Alarms 
------------------------------------------------------------------------------------
Location        Severity     Group            Set Time                   Description                                                                                                                                                                                                                                                
------------------------------------------------------------------------------------
0/RP0/CPU0      Major        Software         03/30/2023 12:30:39 UTC    Communications Failure With Cisco Licensing Cloud                                                                                                                                                                                                          
0/RP0/CPU0      Minor        Software         04/02/2023 13:55:38 UTC     Optics0/0/0/31 - hw_optics:  RX POWER LANE-0 HIGH WARNING                                                                                                                                                                                                 
0/RP0/CPU0      Major        Software         04/02/2023 13:55:38 UTC     Optics0/0/0/31 - hw_optics: Optics media rx signal power high warning                                                                                                                                                                                     
0/RP0/CPU0      Major        Software         04/02/2023 14:00:01 UTC     Optics0/0/0/29 - hw_optics: Optics media tx fifo error                                                                                                                                                                                                    
0/RP0/CPU0      Major        Software         04/02/2023 14:00:01 UTC     Optics0/0/0/29 - hw_optics: Optics media tx loss of alignment                                                                                                                                                                                             
0/RP0/CPU0      Major        Software         04/02/2023 14:00:01 UTC     Optics0/0/0/29 - hw_optics: Optics media tx out of alignment                                                                                                                                                                                              
0/RP0/CPU0      Major        Software         04/02/2023 14:00:01 UTC     Optics0/0/0/29 - hw_optics: Optics media tx CMU loss of lock                                                                                                                                                                                              
0/RP0/CPU0      Major        Software         04/02/2023 14:00:01 UTC     Optics0/0/0/29 - hw_optics: Optics media tx reference clock loss of lock                                                                                                                                                                                  
0/RP0/CPU0      Major        Software         04/02/2023 14:00:01 UTC     Optics0/0/0/29 - hw_optics: Optics media tx deskew loss of lock                                                                                                                                                                                           
0/RP0/CPU0      Major        Software         04/02/2023 14:00:01 UTC     Optics0/0/0/29 - hw_optics: Optics media rx loss of alignment                                                                                                                                                                                             
0/RP0/CPU0      Major        Software         04/02/2023 14:00:01 UTC     Optics0/0/0/29 - hw_optics: Optics media rx out of alignment                                                                                                                                                                                              
0/RP0/CPU0      Major        Software         04/02/2023 14:00:01 UTC     Optics0/0/0/29 - hw_optics: Optics media rx fifo error                                                                                                                                                                                                    
0/RP0/CPU0      Major        Software         04/02/2023 14:00:01 UTC     Optics0/0/0/29 - hw_optics: Optics media rx demodulation loss of lock

The show alarms command displays the alarms for the coherent optical transceivers.