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4.3.3. Unused Transceiver Channels
Unused transceiver channels can degrade in performance over time. To preserve the performance of unused transceiver channels, the Intel® Quartus® Prime software can switch the TX and RX channels on and off at a low frequency using a reference clock.
For more information about preserving the performance of unused transceiver channels refer to Unused or Idle Transceiver Channels section in the Intel Stratix 10 L- and H-tile Transceiver PHY User Guide and Unused Transceiver Channels section in the E-Tile Transceiver PHY User Guide.