This attribute specifies the total path delay metric below which the
variance value specified for delay COS and a low metric range is
used, and at or above which the variance value specified for delay
COS and a high metric range is used.
This attribute defaults to 0, so that the variance value specified for
delay COS and a high metric range is used for all delay paths. If this
attribute is set to 2147483647, the variance value specified for
delay COS and a low metric range is used for all delay paths.