This read-only counter tracks transmissions on this port that were aborted after exceeding 16 attempts due to repeated collisions. An admin treats a nonzero bdgPortTxAbrt count as evidence of severe network contention on that segment, more serious than ordinary occasional collisions since it means frames are being lost entirely. For example, if bdgPortTxAbrt starts incrementing on a port that previously showed only occasional bdgPortColl counts, the admin would recognize the segment has crossed from mild contention into frames actually failing to send.