This read-only Counter32, adapted from the standard Etherlike-MIB, counts the number of times carrier sense was lost or never asserted while this interface attempted to transmit a frame, incremented at most once per transmission attempt regardless of how the carrier sense condition fluctuated. An admin treats a nonzero count here as a sign of a physical-layer problem preventing the interface from properly sensing the medium before transmitting. A rising sheDot3StatsCarrierSenseErrors count would point an admin toward a bad transceiver, cable, or connection at the physical layer of this interface.