Whether LP_UNEQ is a condition for SNCP switching

According to ITU-T suggestions, the standard LP_UNEQ alarm is inserted if no lower-order service is configured. However, some OSN devices cannot detect the LP_UNEQ alarm for triggering SNCP switching. Why?
Board hardware restrictions. Some boards can be upgraded to resolve the problem, whereas some cannot.
No version of SSN1GXCSA, SSN1EXCSA, or SSQ1CXL supports LP_UNEQ detection.

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