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TRANSCEIVER-5: Configuration: 400ZR channel frequency, output TX launch power and operational mode setting.

Summary

Validate setting 400ZR tunable parameters channel frequency, output TX launch power and operational mode and verify corresponding telemetry values.

Goals

  • Verify full C band frequency tunability for 100GHz line system grid.
  • Verify full C band frequency tunability for 75GHz line system grid.
  • Verify adjustable range of transmit output power across -13 to -9 dBm in steps of 1 dB.
  • Verify that the ZR module Host Interface ID and Media Interface ID combination to ZR module AppSel mapping can be configured through the OC operational-mode. operational-mode is a construct in OpenConfig that masks features related to line port transmission. OC operational modes provides a platform-defined summary of information such as symbol rate, modulation, pulse shaping, etc.

Note For standard ZR, OIF 400ZR with C-FEC is the default mode however as we move to 400ZR++ and 800ZR, optic AppSel code would need to be configured explicitly through OC operational mode.

TRANSCEIVER-5.1

  • Connect two ZR interfaces using a duplex LC fiber jumper such that TX output power of one is the RX input power of the other module. Connection between the modules should pass through an optical switch that can be controlled through automation to simulate a fiber cut.

  • To establish a point to point ZR link ensure the following:

    • Both transceivers states are enabled.
    • Validate setting 400ZR optics module tunable laser center frequency across frequency range 196.100 - 191.400 THz for 100GHz grid.
    • Validate setting 400ZR optics module tunable laser center frequency across frequency range 196.100 - 191.375 THz for 75GHz grid.
    • Specific frequency details can be found in 400ZR implementation agreement under sections 15.1 ad 15.2 Operating frequency channel definitions. Link to IA below,
    • Validate adjustable range of transmit output power across -13 to -9 dBm range in steps of 1dB. So the module’s output power will be set to -13, -12, -11, -10, -9 dBm in each step. As an example this can be validated for the module's default frequency of 193.1 THz.

  • With the ZR link established as explained above, for each configured frequency and TX output power value verify that the following ZR transceiver telemetry paths exist and are streamed for both the ZR optics.

    • Frequency
      • /components/component/optical-channel/state/frequency
      • /components/component/optical-channel/state/carrier-frequency-offset/instant
      • /components/component/optical-channel/state/carrier-frequency-offset/avg
      • /components/component/optical-channel/state/carrier-frequency-offset/min
      • /components/component/optical-channel/state/carrier-frequency-offset/max
    • TX Output Power
      • /components/component/optical-channel/state/output-power/instant
      • /components/component/optical-channel/state/output-power/avg
      • /components/component/optical-channel/state/output-power/min
      • /components/component/optical-channel/state/output-power/max
    • Operational Mode
      • /components/component/optical-channel/state/operational-mode

  • With above streamed data verify

    • For each center frequency, laser frequency offset should not be more than +/- 1.8 GHz max.
    • For each center frequency, streamed value should be in Mhz units. Test should fail if the streamed value is in Hz or THz units. As an example 193.1 THz would be 193100000 in MHz.
    • When set to a specific target output power, transmit power control absolute accuracy should be within +/- 1 dBm of the target value.
    • For reported data check for validity: min <= avg/instant <= max

TRANSCEIVER-5.2

  • When the modules or the devices are still in a boot stage, they must not stream any invalid string values like "nil" or "-inf".

  • Frequency must be specified as uint64 in MHz. Streamed values for frequency offset must be of type decimal64.

  • TX Output power must be of type decimal64.

TRANSCEIVER-5.3

  • Verify that the optics Tunable Frequency and TX output power tunes back to the correct value as per configuration after the interface flaps.

    • Enable a pair of ZR interfaces on the DUT as explained above.
    • Verify the ZR optics frequency and TX output power telemetry values are set in the normal range.
    • Disable or shut down the interface on the DUT.
    • Verify with interfaces in down state both optics are still streaming configured value for frequency.
    • Verify for the TX output power with interface in down state a decimal64 value of -40 dB is streamed.
    • Re-enable the interfaces on the DUT.
    • Verify the ZR optics tune back to the correct frequency and TX output power as per the configuration and related telemetry values are updated to the value in the normal range again.

  • With above test also verify

    • Laser frequency offset should not be more than +/- 1.8 GHz max from the configured centre frequency.
    • When set to a specific target output power, transmit power control absolute accuracy should be within +/- 1 dBm of the target configured output power.
    • For reported data check for validity: min <= avg/instant <= max

TRANSCEIVER-5.4

  • Verify that the optics Tunable Frequency and TX output power tunes back to the correct value as per configuration after a fiber cut.

    • Enable a pair of ZR interfaces on the DUT as explained above.
    • Verify the ZR optics Frequency and TX output power telemetry values are in the normal range.
    • Simulate a fiber cut using the optical switch that sits in-between the DUT ports.
    • Verify with link in down state due to fiber cut both optics are streaming uint64 for frequency and decimal64 for TX output power.
    • Re-enable the optical switch connection to clear the fiber cut fault.
    • Verify the ZR optics is able to stay tuned to the correct frequency and TX output power as per the configuration.

  • With above test also verify

    • Laser frequency offset should not be more than +/- 1.8 GHz max from the configured centre frequency.
    • When set to a specific target output power, transmit power control absolute accuracy should be within +/- 1 dBm of the target configured output power.
    • For reported data check for validity: min <= avg/instant <= max

Note: For min, max, and avg values, 10 second sampling is preferred. If 10 seconds is not supported, the sampling interval used must be communicated.

OpenConfig Path and RPC Coverage

paths:
  /components/component/transceiver/config/enabled:
    platform_type: ["TRANSCEIVER"]
  /components/component/optical-channel/config/frequency:
    platform_type: ["OPTICAL_CHANNEL"]
  /components/component/optical-channel/config/target-output-power:
    platform_type: ["OPTICAL_CHANNEL"]
  /components/component/optical-channel/config/operational-mode:
    platform_type: ["OPTICAL_CHANNEL"]
  /components/component/optical-channel/state/frequency:
    platform_type: ["OPTICAL_CHANNEL"]
  /components/component/optical-channel/state/carrier-frequency-offset/instant:
    platform_type: ["OPTICAL_CHANNEL"]
  /components/component/optical-channel/state/carrier-frequency-offset/avg:
    platform_type: ["OPTICAL_CHANNEL"]
  /components/component/optical-channel/state/carrier-frequency-offset/min:
    platform_type: ["OPTICAL_CHANNEL"]
  /components/component/optical-channel/state/carrier-frequency-offset/max:
    platform_type: ["OPTICAL_CHANNEL"]
  /components/component/optical-channel/state/output-power/instant:
    platform_type: ["OPTICAL_CHANNEL"]
  /components/component/optical-channel/state/output-power/avg:
    platform_type: ["OPTICAL_CHANNEL"]
  /components/component/optical-channel/state/output-power/min:
    platform_type: ["OPTICAL_CHANNEL"]
  /components/component/optical-channel/state/output-power/max:
    platform_type: ["OPTICAL_CHANNEL"]
  /components/component/optical-channel/state/operational-mode:
    platform_type: ["OPTICAL_CHANNEL"]

rpcs:
  gnmi:
    gNMI.Set:
      replace: true
    gNMI.Subscribe:
      on_change: true

Required DUT platform

FFF

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