The sub-sea feature is a special configuration that you can provision on the line card to bring up optical links in a sub-sea network. This configuration involves configuring the following parameters on the optics controller to achieve spectral efficiency:

• Roll-off factor

• Non-linear compensation

• TIA colorless setting

• SOP tolerance

• RX VOA mode

• RX VOA setpoint

• Carrier phase recovery parameters

To configure the sub-sea parameters for the optics controller, use the commands listed in this table:

ios(config-optics)#filter-roll-off-factor <0-1>

ios(config-optics)#rx-voa target-power <-190,+30>

ios(config-optics)#rx-voa fixed-ratio <+100,+1700>

ios(config-optics)#enh-colorless-mode <1-3>

ios(config-optics)#enh-sop-tol-mode <1-3>

ios(config-optics)#nleq-comp-mode <1-5>

Ios(config-optics)#cross-pol-gain-mode <1-15>

ios(config-optics)#cross-pol-weight-mode <1-7>

ios(config-optics)#cpr-win-mode <1-4>

ios(config-optics)#cpr-ext-win-mode <1-9>

ios(config-optics)#submarine-params <1-10> <1 – 1000>

The following is a sample in which the filter roll-off factor is configured on the optics controller.

RP/0/RP0/CPU0:ios#configure
Mon Jul 15 08:43:02.521 UTC
RP/0/RP0/CPU0:ios(config)#controller optics 0/1/0/0
RP/0/RP0/CPU0:ios(config-Optics)#filter-roll-off-factor 0.002
RP/0/RP0/CPU0:ios(config-Optics)#commit
Mon Jul 15 08:43:26.578 UTC
RP/0/RP0/CPU0:ios(config-Optics)#

The register settings feature is enabled by default on the optics controller for 1.2T and 1.2TL cards. The register settings feature enables you to provision submarine proprietary parameters of Type 1 to Type 10 and store values for these parameter types in the specific memory locations of the NCS 1004 system. The system uses these proprietary values based on requirement.

Currently, the memory location for Type 1 alone is editable for testing purposes. The Type 2 to Type 10 are read-only memory (ROM). To provision the memory locations for Type 2 to Type 10, contact Cisco TAC.

You can view the submarine proprietary parameter values (Type 1 to Type 10) in the output of the show controller optics command.

You can assign specific testing requirement for each type (from Type 1 to Type 10) and allocate a value using the controller optics R/S/I/P submarine-params command. For example, you can assign a value on how much power is required for the NCS 1004 system so that it can be used for submarine testing to check the exact location of the fiber cut in the cable. This value can be tuned for shorter or longer distance signal transmission.

The following PM parameters are supported for the sub-sea configuration.

• SNR (db)

• SNR-AX (db)

• SNR-BX (db)

• SNR-AY (db)

• SNR-BY (db)

• SOP-S1

• SOP-S2

• SOP-S3

The SNR AX and SNR AY parameters correspond to modulation format A whereas SNR BX and SNR BY correspond to the modulation format B. These modulation formats are applied to the optics controller. When the optics controllers are configured to a single modulation format, only the SNR AX and SNR AY values are displayed. In this case, the SNR-BX and SNR-BY values display 0 unless the configured BPS values are 1 or 3.

In the following example, the optics controller is configured to a single modulation format.

RP/0/RP0/CPU0:ios#show controller optics 0/1/0/1
Thu Aug 29 07:08:36.734 UTC

 Controller State: Up

 Transport Admin State: In Service

 Laser State: On

 LED State: Green

 Optics Status

         Optics Type:  DWDM optics
         DWDM carrier Info: C BAND, MSA ITU Channel=61, Frequency=193.10THz,
         Wavelength=1552.524nm

         Alarm Status:
         -------------
         Detected Alarms: None


         LOS/LOL/Fault Status:

         Alarm Statistics:

         -------------
         HIGH-RX-PWR = 0            LOW-RX-PWR = 0
         HIGH-TX-PWR = 0            LOW-TX-PWR = 0
         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 = -1.48 dBm
         RX Power = -9.11 dBm
         RX Signal Power = -9.26 dBm
         Frequency Offset = 7 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 =  69.4351043701 GBd
         Bits per Symbol = 2.0000000000  bits/symbol
         Modulation Type: QPSK
         Chromatic Dispersion 434 ps/nm
         Configured CD-MIN -20000 ps/nm  CD-MAX 100000 ps/nm
         Polarization Mode Dispersion = 0.0 ps
         Second Order Polarization Mode Dispersion = 29.00 ps^2
         Optical Signal to Noise Ratio = 37.60 dB
         SNR = 17.30 dB
         Polarization Dependent Loss = 0.30 dB
         Polarization Change Rate = 0.00 rad/s
         Differential Group Delay = 2.00 ps
         Filter Roll Off Factor : 0.100
         Rx VOA Fixed Ratio : 15.00 dB
         Enhanced Colorless Mode : 0
         Enhanced SOP Tolerance Mode : 0
         NLEQ Compensation Mode : 0
         Cross Polarization Gain Mode : 0
         Cross Polarization Weight Mode : 0
         Carrier Phase Recovery Window : 0
         Carrier Phase Recovery Extended Window : 0


 AINS Soak                : None
 AINS Timer               : 0h, 0m
 AINS remaining time      : 0 seconds

RP/0/RP0/CPU0:ios#

For the example illustrated above, the SNR AX and SNR AY parameters corresponding to modulation format A are only displayed. The values of the SNR BX and SNR BY parameters are 0.

RP/0/RP0/CPU0:ios#show controller optics 0/1/0/1 pm current 15-min optics 1
Thu Aug 29 07:17:54.368 UTC

Optics in the current interval [07:15:00 - 07:17:54 Thu Aug 29 2019]

Optics current bucket type : Valid
        MIN       AVG       MAX   Operational     Configured      TCA   Operational    Configured     TCA
                                 Threshold(min)   Threshold(min) (min) Threshold(max) Threshold(max) (max)
LBC[% ]: 0.0      0.0       0.0       0.0           NA           NO    100.0            NA           NO

OPT[dBm]: -1.57   -1.49    -1.39    -30.00          NA           NO     63.32           NA           NO

OPR[dBm] : -9.15  -9.10    -9.06    -30.00          NA           NO     63.32           NA           NO

CD[ps/nm]: 432     433     434      -180000         NA           NO    180000           NA           NO

DGD[ps ]: 1.00     1.94     2.00      0.01          NA           NO   21474836.46      NA           NO

SOPMD[ps^2]:2.00   21.39    53.00     0.01          NA           NO   21474836.46      NA           NO

OSNR[dB]: 37.60    37.60    37.60     0.01          NA           NO   21474836.46      NA           NO

PDL[dB]: 0.30      0.32      0.40     0.01          NA           NO   21474836.46      NA           NO

PCR[rad/s]: 0.00   0.00      0.00     0.01          NA           NO   21474836.46      NA           NO

RX_SIG[dBm]:-9.28 -9.22     -9.15    -30.00          NA          NO   63.32            NA           NO

FREQ_OFF[Mhz]: -188 -42       58     -1500           NA          NO   1500             NA           NO

SNR[dB]  : 17.20   17.36     17.50    0.00           NA          NO   0.00             NA           NO

SNR-AX[dB]:17.10   17.31     17.50    0.00           NA          NO   0.00             NA           NO

SNR-AY[dB]:17.20   17.42     17.70    0.00           NA          NO   0.00             NA            NO

SNR-BX[dB]: 0.00   0.00      0.00     0.00           NA          NO   0.00             NA            NO

SNR-BY[dB]: 0.00   0.00      0.00     0.00           NA           NO   0.00            NA            NO

SOP-S1    : 0.45   0.53      0.59     0.00           NA           NO   0.00             NA           NO

SOP-S2    : 0.67   0.74      0.80     0.00           NA           NO   0.00             NA           NO

SOP-S3    : 0.34   0.39      0.44     0.00           NA           NO   0.00             NA           NO

In the following example, the optics controller is configured to a BPS value of 3.

RP/0/RP0/CPU0:ios#show controllers optics 0/2/0/0
Thu Aug 29 07:20:35.260 UTC

 Controller State: Up

 Transport Admin State: In Service

 Laser State: On

 LED State: Yellow

 Optics Status

         Optics Type:  DWDM optics
         DWDM carrier Info: C BAND, MSA ITU Channel=55, Frequency=193.40THz,
         Wavelength=1550.116nm

         Alarm Status:
         -------------
         Detected Alarms:
                 LOW-RX-PWR

         LOS/LOL/Fault Status:

         Alarm Statistics:

         -------------
         HIGH-RX-PWR = 0            LOW-RX-PWR = 1
         HIGH-TX-PWR = 0            LOW-TX-PWR = 0
         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 = -1.50 dBm
         RX Power = -13.52 dBm
         RX Signal Power = -13.39 dBm
         Frequency Offset = 128 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 =  69.4350967407 GBd
         Bits per Symbol = 3.0000000000  bits/symbol
         Modulation Type: 8QAM
         Chromatic Dispersion -15 ps/nm
         Configured CD-MIN -20000 ps/nm  CD-MAX 100000 ps/nm
         Polarization Mode Dispersion = 0.0 ps
         Second Order Polarization Mode Dispersion = 59.00 ps^2
         Optical Signal to Noise Ratio = 30.90 dB
         SNR = 14.30 dB
         Polarization Dependent Loss = 1.90 dB
         Polarization Change Rate = 0.00 rad/s
         Differential Group Delay = 4.00 ps
         Filter Roll Off Factor : 0.352
         Rx VOA Target Power : -15.0 dBm
         Enhanced Colorless Mode : 2
         Enhanced SOP Tolerance Mode : 1
         NLEQ Compensation Mode : 2
         Cross Polarization Gain Mode : 2
         Cross Polarization Weight Mode : 3
         Carrier Phase Recovery Window : 3
         Carrier Phase Recovery Extended Window : 8


 AINS Soak                : None
 AINS Timer               : 0h, 0m
 AINS remaining time      : 0 seconds

RP/0/RP0/CPU0:ios#

Although the optics controller is configured to a single modulation format in the example illustrated above, the SNR BX and SNR BY parameters are also displayed along with the SNR AX and SNR AY parameters.

RP/0/RP0/CPU0:ios#show controller optics 0/2/0/0 pm current 15-min optics 1
Thu Aug 29 07:19:24.064 UTC

Optics in the current interval [07:15:00 - 07:19:24 Thu Aug 29 2019]

Optics current bucket type : Valid
         MIN       AVG       MAX      Operational      Configured      TCA   Operational      Configured     TCA
                                      Threshold(min)   Threshold(min) (min) Threshold(max)   Threshold(max) (max)
LBC[% ] : 0.0       0.0       0.0      0.0               NA              NO   100.0            NA             NO

OPT[dBm]: -1.53     -1.49     -1.45    -30.00            NA              NO   63.32            NA              NO

OPR[dBm]: -13.86    -13.83    -13.79   -30.00            NA              NO   63.32            NA              NO

CD[ps/nm]: -18       -14       -10      -180000          NA              NO   180000          NA               NO

DGD[ps ]: 2.00      3.28        5.00     0.01            NA              NO   21474836.46      NA              NO

SOPMD[ps^2]:10.00   88.72     345.00     0.01            NA              NO   21474836.46      NA              NO

OSNR[dB] : 30.20     30.79     31.60     0.01            NA              NO   21474836.46      NA              NO

PDL[dB]   : 1.70      1.99      2.20     0.01            NA              NO   21474836.46      NA              NO

PCR[rad/s]: 0.00      26.84     105.00   0.01            NA              NO   21474836.46      NA              NO

RX_SIG[dBm]: -13.77   -13.71    -13.66   -30.00          NA              NO   63.32            NA              NO

FREQ_OFF[Mhz]: 43        144       249      -1500        NA              NO   1500             NA              NO

SNR[dB]   : 14.10     14.24     14.40    0.00            NA              NO   0.00             NA              NO

SNR-AX[dB]: 14.00     14.30     14.50    0.00            NA              NO   0.00             NA              NO

SNR-AY[dB]: 13.90     14.18     14.40    0.00            NA              NO   0.00             NA              NO

SNR-BX[dB]: 6.70      6.81      6.90     0.00            NA              NO   0.00             NA              NO

SNR-BY[dB]: 6.60      6.81      6.80     0.00            NA              NO   0.00             NA              NO

SOP-S1    : 0.13      0.31      0.58     0.00            NA              NO   0.00             NA              NO

SOP-S2    : 0.58      0.76      0.88     0.00            NA              NO   0.00             NA              NO

SOP-S3    : 1.84      2.02      2.21     0.00            NA              NO   0.00             NA              NO


Last clearing of "show controllers OPTICS" counters never
RP/0/RP0/CPU0:ios#

NCS 1004 is capable of internally polling the third-party devices (for example, AC1200) for subsea configuration parameters and retrieving data for every 1.6 seconds. AC1200is capable of sending the State of Polarization (SOP) parameters such as SOP-S1, SOP-S2, and SOP-S3 of Network lane monitoring capabilities, at a faster sampling granularity of 50–70 ms. The FLEXCOH driver internally polls and returns data to the line card at the rate of 1.6 -1.8 seconds.

The SOP parameters can be collected either though CLI or gRPC Network Management Interface (gNMI) method.

The SOP parameters that are obtained through CLI are:

• Multiple sets of parameters, with each set having 32 samples of each of the three SOP parameters (a maximum of 1200 samples per minute by considering the best case of 32 samples every 1.6 secs).

• A unique index denoting every set of 32 samples. The subsequent set of samples have an incremental index.

• The time interval denoting the time that is taken between the collection of previous and current samples. NCS 1004 calculates the timestamp for each sample and displays the timestamp in the show output.

The SOP parameters that are obtained through gNMI are:

• A maximum of 1200 samples for each trunk optics in each collection

• Each sample has a unique-id leaf (0-1199) that uniquely identifies the 1200 samples that are collected during each retrieval​

• Leaf index indicating the index number for time interval, SOP1, SOP2, SOP3, and timestamp

  • The leaf index denotes a set of 32 samples

  • Each collection has approximately 1200 samples with 37 indexes

You can use these data to experiment the subsea cables and to study the possibility of an earthquake.