This read-write Unsigned32 holds the higher 32 bits of the 64-bit threshold value configured against the STS/VC Path variable named in stsVcPathThresholdVariable. An admin writes this object when the desired threshold limit is large enough to need the upper half of a 64-bit value, common for cumulative path error counters. For a 5-billion coding-violation alert threshold on a heavily loaded STS-3c path, the admin puts the significant upper bits in stsVcPathThresholdValueHi.