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Why are DWDM XFP tunables reporting incorrect wavelength channels?

Why are the channel numbers output from "show controllers tenGigE <port> phy" reporting incorrect channels?

I have seen this in IOS XR 4 and 5 now. The channel is incorrect but the tuned wave is correct and the channel appears correct in the configuration.

I searched for caveats but found nothing... Am I just overlooking something?

RP/0/RSP0/CPU0:ios(config)#int tenGigE 0/1/0/0

RP/0/RSP0/CPU0:ios(config-if)#shut

RP/0/RSP0/CPU0:ios(config-if)#controller dwdm 0/1/0/0

RP/0/RSP0/CPU0:ios(config-dwdm)#admin-state maintenance

Wed Mar  5 11:29:49.698 UTC

Maintenance will be Forced one if it is disabled for this port. You may first verify the status by the show interfaces command.

RP/0/RSP0/CPU0:ios(config-dwdm)#commit

Wed Mar  5 11:29:50.818 UTC

RP/0/RSP0/CPU0:ios(config-dwdm)#wavelength 55

RP/0/RSP0/CPU0:ios(config-dwdm)#commit

Wed Mar  5 11:29:58.577 UTC

RP/0/RSP0/CPU0:ios(config-dwdm)#admin-state in-service

RP/0/RSP0/CPU0:ios(config-dwdm)#commit

Wed Mar  5 11:30:05.217 UTC

RP/0/RSP0/CPU0:ios(config-dwdm)#int tenGigE 0/1/0/0    

RP/0/RSP0/CPU0:ios(config-if)#no shut

RP/0/RSP0/CPU0:ios(config-if)#commit

Wed Mar  5 11:30:13.810 UTC

RP/0/RSP0/CPU0:ios(config-if)#exit

RP/0/RSP0/CPU0:ios(config)#exi

RP/0/RSP0/CPU0:ios#

RP/0/RSP0/CPU0:ios#

RP/0/RSP0/CPU0:ios#show controllers tenGigE 0/1/0/0 phy | begin Signal

Wed Mar  5 11:30:32.570 UTC

        Signal Condition Control: Normal Async REFCLK,

        Thresholds:                    Alarm High         Warning High          Warning Low            Alarm Low

              Temperature:               73.000                70.000                -5.000                -8.000

                  Voltage:           0.000 Volt            0.000 Volt            0.000 Volt            0.000 Volt

                     Bias:         85.000 mAmps          72.000 mAmps          10.000 mAmps           5.000 mAmps

           Transmit Power:  3.981 mW (6.00 dBm)   2.512 mW (4.00 dBm)   0.794 mW (-1.00 dBm)   0.501 mW (-3.00 dBm)

            Receive Power:  0.398 mW (-4.00 dBm)   0.251 mW (-6.00 dBm)   0.002 mW (-27.96 dBm)   0.001 mW (-30.00 dBm)

        Laser First Frequency: 191 THz, 950.000 GHz

        Laser Last Frequency: 196 THz, 0.000 GHz

        Laser Min Grid Spacing: 50.000 GHz

        Wavelength Control: setpoint=1550.05 nm, error=0.00 nm

        FEC Control: amplitude_threshold=50.00%, phase_setpoint=50.00%

        Temperature: 42.949

        Voltage: 0.000 Volt

        Tx Bias: 20.654 mAmps

        Tx Power:  1.413 mW (1.50 dBm)

        Rx Power:  0.000 mW (<-40.00 dBm)

        Control Status: Module NR, Interrupt, Rx LOS,  Rx not ready, Rx CDR not locked,

        Wavelength Channel: 30

        Wavelength Error: 0.000 GHz

1 REPLY
Cisco Employee

1)CLI configures XR Channel. 

1)

CLI configures XR Channel. 

 'wavelength 55' maps to Wavelength '1550.116 nm'

 

The following CLI gives CLI mapping to Wavelength (nm).

RP/0/RSP0/CPU0:RR03#sh controllers dwdm 0/1/0/0 wavelength-map 

 

    55    6               193.40          1550.116

 

2) 

SW translates configured 'wavelength <channel number>' to 

Optics Channel number (30) to get Wavelength 1550.05 nm.

 

 

RP/0/RSP0/CPU0:ios#show controllers tenGigE 0/1/0/0 phy | begin Signal

..

        Laser First Frequency: 191 THz, 950.000 GHz

        Laser Last Frequency: 196 THz, 0.000 GHz

        Laser Min Grid Spacing: 50.000 GHz

        Wavelength Control: setpoint=1550.05 nm, error=0.00 nm

        FEC Control: amplitude_threshold=50.00%, phase_setpoint=50.00%

        Temperature: 42.949

        Voltage: 0.000 Volt

        Tx Bias: 20.654 mAmps

        Tx Power:  1.413 mW (1.50 dBm)

        Rx Power:  0.000 mW (<-40.00 dBm)

        Control Status: Module NR, Interrupt, Rx LOS,  Rx not ready, Rx CDR not locked,

        Wavelength Channel: 30

        Wavelength Error: 0.000 Ghz


 

3)


 

Instead we recommend our customers to use the following CLI which gives option to 

Configure wavelength in 'nm'. 


 

RP/0/RSP0/CPU0:RR03(config-dwdm)#wavelength update ?

  <1528773-1568362>  Enter 7-digit Wavelength data; e.g. 1532290 for 1532.29 nm

 

Available wavelength is given by this CLI. 

RP/0/RSP0/CPU0:RR03#sh controllers dwdm 0/1/0/0 wavelength-map 

 

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