Validate 400ZR optics module reports performance metric (PM) data as defined in module CMIS VDM(Versatile Diagnostics Monitor):

• eSNR is defined as the electrical Signal to Noise ratio at the decision sampling point in dB
• Q-value is the decibel (dB) value representing signal BER.
• pre-FEC BER bit error rate.

• 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.

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

  • Both transceivers state is enabled
  • Both transceivers are set to a valid target TX output power example -10 dBm.
  • Both transceivers are tuned to a valid centre frequency example 193.1 THz.

• With the link ZR link established as explained above, verify that the following ZR transceiver telemetry paths exist and are streamed for both the ZR optics.

  • /terminal-device/logical-channels/channel/otn/state/esnr/instant
  • /terminal-device/logical-channels/channel/otn/state/esnr/avg
  • /terminal-device/logical-channels/channel/otn/state/esnr/min
  • /terminal-device/logical-channels/channel/otn/state/esnr/max
  • /terminal-device/logical-channels/channel/otn/state/q-value/instant
  • /terminal-device/logical-channels/channel/otn/state/q-value/avg
  • /terminal-device/logical-channels/channel/otn/state/q-value/min
  • /terminal-device/logical-channels/channel/otn/state/q-value/max
  • /terminal-device/logical-channels/channel/otn/state/pre-fec-ber/instant
  • /terminal-device/logical-channels/channel/otn/state/pre-fec-ber/avg
  • /terminal-device/logical-channels/channel/otn/state/pre-fec-ber/min
  • /terminal-device/logical-channels/channel/otn/state/pre-fec-ber/max

• For reported data check for validity min <= avg/instant <= max

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

• Q-value, eSNR and pre-Fec BER must always be of type decimal64. When link interfaces are in down state 0.0 must be reported as a valid default value.

  • Typical expected value range for eSNR is 13.5 to 18 dB +/-0.1 dB.
  • Typical expected value for Pre-FEC BER should be less than 1.2E-2.
  • Typical expected Q-value should be greater than 7 dB.

Note: For min, max, and avg values, 10 second sampling is preferred. If 10 seconds is not supported, the sampling interval used must be specified by adding a deviation to the test.

• Verify that the optics PM data is updated after the interface flaps.

  • Enable a pair of ZR interfaces on the DUT as explained above.
  • Subscribe SAMPLE to the above PM leafs with a sample rate of 10 seconds.
  • Verify the ZR optics PMs are in the normal range.
  • Use /components/component/transceiver/config/enabled to disable the transceiver, wait 10 seconds and then re-enable the transceiver.
  • Verify that the PM leafs report '0' during the reboot and no value of nil or -inf is reported.
  • Re-enable the interfaces on the DUT.
  • Verify the ZR optics pre FEC PM is updated to the value in the normal range again.

• /components/component/transceiver/config/enabled

*   /terminal-device/logical-channels/channel/otn/state/esnr/instant
*   /terminal-device/logical-channels/channel/otn/state/esnr/avg
*   /terminal-device/logical-channels/channel/otn/state/esnr/min
*   /terminal-device/logical-channels/channel/otn/state/esnr/max
*   /terminal-device/logical-channels/channel/otn/state/q-value/instant
*   /terminal-device/logical-channels/channel/otn/state/q-value/avg
*   /terminal-device/logical-channels/channel/otn/state/q-value/min
*   /terminal-device/logical-channels/channel/otn/state/q-value/max
*   /terminal-device/logical-channels/channel/otn/state/pre-fec-ber/instant
*   /terminal-device/logical-channels/channel/otn/state/pre-fec-ber/avg
*   /terminal-device/logical-channels/channel/otn/state/pre-fec-ber/min
*   /terminal-device/logical-channels/channel/otn/state/pre-fec-ber/max

FFF - Fixed form factor