This counts the total number of seconds during 2047-pattern DS0 far-end testing on this port that had zero bit errors. Combined with pportDS0BitErroredSeconds, this gives a time-based rather than raw bit-count view of this channel's error performance, which is the standard metric telecom SLAs are often measured against rather than total bit-error count alone. A test run showing 3,595 error-free seconds out of a 3,600-second one-hour test on this DS0 channel indicates errors were confined to just 5 seconds of that hour.