The MA5600T/MA5680T is a Huawei Optical Line Terminal (OLT) device used in GPON networks. The status of the control board's indicator lights provides critical information about the device's operational state.
* Option A :
* Incorrect : If the green light is on and off repeatedly without a specific pattern, it may indicate an unstable or faulty state.
* Option B :
* Correct : A steady green light indicates that the control board is running properly and is in a normal operating state. This is the expected status for a healthy control board.
* Option C :
* Incorrect : A blinking pattern of 0.5s on and 0.5s off typically indicates that the control board is in a transitional state, such as booting up or initializing.
* Option D :
* Incorrect : A rapid blinking pattern of 0.25s on and 0.25s off usually signifies an alarm or error condition.
Thus, the correct answer is B , as a steady green light indicates normal operation.
References:
* HCIA Huawei ACCESS Official Documentation , Chapter: OLT Device Indicators.
* MA5600T/MA5680T Maintenance Manual by Huawei.

* Querying Receive Optical Power :
* Monitoring the receive optical power of an ONU is critical for troubleshooting and ensuring proper signal strength.
* Command Analysis :
* display ont optical-info : Displays detailed optical information for the ONU, including receive and transmit optical power.
* display pon optical-info : Provides optical information for the entire PON port, not specific to individual ONUs.
* display board : Shows hardware status of the OLT board, not optical power details.
* display port state : Displays the operational state of ports, not optical power information.
* Why A?
* The display ont optical-info command is specifically designed to query the optical power of an individual ONU.
Thus, the correct answer is A .
References:
* HCIA Huawei ACCESS Official Documentation , Chapter: ONU Optical Monitoring.
* OLT Command Reference Guide by Huawei.