PIU backup rule of an OSN 9800 U64 subrack

PIU boards in an OSN 9800 U64 subrack are configured as follows:
PIU boards on the front and rear sides (installed back-to-back) are in mutual backup. For example, PIU boards in the IU100 and IU121 slots are in mutual backup, and PIU boards in IU101 and IU120 slots are in mutual backup.

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