ID:18653 <name> preservation of unused TX channels is enabled. Preserving <number> unused TX channel location(s).

CAUSE: Specifies the number of unused TX channel locations.

ACTION: To preserve the performance of the unused TX channels over time, add the assignment 'set_instance_assignment -name PRESERVE_UNUSED_XCVR_CHANNEL ON -to <pin_name>' in your QSF file.