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