This counter tracks the number of ENDAK (End Acknowledge) PDUs transmitted on this port, per the description, sent to confirm that this port has processed a received END and torn down the SSCOP link accordingly. This count should track NumEndPduRx closely; a lag between the two would mean this port is slow to confirm link teardown, which can leave the far end retrying its END request under timer TCC. On a card handling a planned signaling-link shutdown, expect this counter to increment exactly once per graceful teardown.