滑码告警是在传输层标头标示设备有没有帧丢失！
The LOF is a condition transmitted in the physical overhead indicating that the receiving equipment has lost frame delineation .
滑码告警是在传输层标头标示设备有没有帧丢失！
The LOF is a condition transmitted in the physical overhead indicating that the receiving equipment has lost frame delineation .
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