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Configure Optics

Learn how to configure optics interfaces and set optics options on an interface.

To configure the optics-specific options on the interface:

  1. Specify the modulation format at the [edit interface interface-name optics-options] hierarchy level.
  2. Specify encoding.
  3. Specify the optical transmit laser output power in dBm. The default transmit laser output value is 0 dBm.
  4. Specify the wavelength of the optics in nanometers. For a list of wavelengths supported, see wavelength.

To configure the OTN-specific options on the interface:

  1. At the [edit interfaces interface-name otn-options] enable the laser on the OTN interface. The laser is disabled by default for all OTN interfaces.

  2. Set an trail trace identifier for the source access point and for the destination access point for ODU and OTU on the OTN interface.

  3. By default, triggers are ignored. Specify defect triggers and the set the trigger hold time for the trigger. Possible values for the trigger hold time are as follows: down—Delay before marking interface down when defect occurs (1—65534 ms) and up—Delay before marking interface up when defect is absent (1—65534 ms).

    The hold time value only impacts the alarm reporting time and does not mark an interface down when the defect occurs. To mark the interface up or down, you must also configure the physical interface hold time at the [edit interfaces interface-name] hierarchy level.

  4. Enable the threshold crossing alarms for the OTN interface along with the trigger for the defect.

  5. Set the OTN header bytes as a transmit payload type from 0 bytes through 255 bytes for the packets that are transmitted on the OTN interface.

  6. Configure the forward error correction (FEC) mode for the OTN interface. Possible values are: Generic Forward Error Correction (GFEC), or High Gain Forward Error Correction (HGFEC) or Soft Decision Forward Error Correction (SDFEC). The default forward error correction mode is SDFEC.

  7. Enable line loopback or local host loopback for the OTN interface.

  8. Enable an ODU locked maintenance signal on the OTN interface to send the signal pattern 01010101.

  9. Enable an ODU open connection indication signal on the OTN interface to send to send the signal pattern 01100110.

  10. Enable a consequent action as listed in the ITU-T G.798 standard for ODU trail trace identifier mismatch (TTIM) on the OTN interface.

  11. Enable a consequent action as listed in the ITU-T G.798 standard for OTU trail trace identifier mismatch (TTIM) on the OTN interface.

  12. Configure the OTN payload pseudorandom binary sequence (PRBS) on the OTN interface.

  13. Configure the line rate or speed of the OTN signal to OTU4 (100Gbps) for the OTN interface.

    Note:

    If you specify a value other than OTU4, the value is ignored. To verify the line rate, use the show interfaces interface-name extensive command.

  14. Configure the threshold value for signal degradation when an alarm needs to be raised. Configure the threshold value after signal degradation when the alarm needs to be cleared. When you configure the interval along with the ber-threshold-signal-degrade value statement, the bit error rate (BER) must stay above the signal degradation threshold for the configured interval after which the alarm is raised. When the interval is configured along with the ber-threshold-clear value statement, then BER must stay below the clear threshold for the configured interval after which the alarm is cleared.

  15. Enable the following actions for the preemptive-fast-reroute statement:

    • Backward FRR—Insert the local pre-FEC status into the transmitted OTN frames and monitor the received OTN frames for the pre-FEC status.

    • ODU backward FRR—Insert the ODU status into the transmitted OTN frames and monitor the received OTN frames for the ODU BER status.

    • Monitoring of signal degradation of pre-FEC OTN frames.

    • Monitoring of signal degradation of ODU BER in the received OTN frames.

  16. Configure the following options for ODU BER signal degradation on the OTN interface:

    • Configure the threshold for signal degradation for ODU BER when an alarm needs to be raised.

    • Configure the threshold for ODU BER after signal degradation when the alarm needs to be cleared.

    • When you configure the interval along with the ber-threshold-signal-degrade value statement, the ODU bit error rate (BER) must stay above the signal degradation threshold for the configured interval after which the alarm is raised. When the interval is configured along with the ber-threshold-clear value statement, then ODU BER must stay below the clear threshold for the configured interval after which the alarm is cleared.

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