A read-only Counter32 giving the cumulative number of seconds the link spent out of synchronization since it was last administratively brought up, current as of this operational minute. Sync loss generally means far worse than a mere errored codeword, since the radios have lost lock entirely, so this counter tracks the most severe class of connectivity interruption. For example, a subscriber unit that keeps briefly dropping and reacquiring sync during marginal weather would show p2mpSu1MinSyncLossSeconds steadily climbing even if its plain codeword error counters stay comparatively low.