* Mean Optical Transmit Power Testing :
* Testing the mean optical transmit power involves measuring the output power of an optical interface using an optical power meter.
* Analysis of Options :
* Option A : Correct. Repeating measurements ensures accuracy and verifies compliance with technical specifications.
* Option B : Correct. Calibration of the optical power meter is essential for accurate measurements.
* Option C : Correct. Clean and proper connections prevent signal loss and ensure reliable measurements.
* Option D : Incorrect. The test pigtail should be connected to the Tx (transmit) port of the optical interface board, not the Rx (receive) port.
* Why D?
* Connecting the test pigtail to the Rx port instead of the Tx port is incorrect and would result in no measurable transmit power.
Thus, the correct answer is D .
References:
* HCIA Huawei ACCESS Official Documentation , Chapter: Optical Interface Testing.
* Optical Power Measurement Procedures by Huawei.