During WDM engineering and maintenance, engineers often adjust optical power, especially the attenuation of the VA1 and VA4. The history adjustments and results are hard to record and query manually. Moreover, manual recording and query are prone to errors and are not persuasive. In addition, in the case of performance deterioration due to adjustments, the responsibility is hard to identify.
The VA1 and VA4 maintain an adjustment log. The log records the history adjustments in detail. For more information, refer to the attachment.
Refer to the attachment.