A read-only CwrPercentageValue, in units of 0.00001 percent, giving the ratio of cumulative Codeword Errored Seconds to Link Admin Up seconds, expressed as a percentage. It is the lifetime error-second rate, giving an admin one normalized figure comparable across links of different total uptime rather than raw error-second counts that would naturally differ by link age. For example, comparing p2mpSuPctErroredSeconds across several subscriber units on the same head end would let an admin identify which specific link is proportionally the worst performer, regardless of how long each has been up.