This read-only Counter tracks the count of times carrier sense was lost during a transmission attempt on the CPE's Ethernet interface, tallied per hourly interval. Operationally, a loss of carrier sense mid-transmit usually points to a flaky physical link, such as a loose Ethernet cable or a failing port on the far end. For example, a technician seeing this counter increase on a specific CPE would first check whether the Ethernet cable to the customer's switch is properly seated.