This read-only counter tracks the total number of times this modem has lost carrier signal since initialization. Admins treat frequent carrier loss as a serious line-quality or physical-connection problem, often more severe than retrains since it typically drops the call entirely rather than just slowing it down. For example, a modem with an unusually high cmmCarrierLossEvents count compared to its peers would be a strong candidate for a hardware inspection or a check of its physical line connection.