Hello!
Thank you for posting on our Huawei Forum. Please be informed that in order to download the LMT tool (signaling analysis tool), you will need to go to the Huawei Enterprise support website and download the tool based on the firmware version of U1900.
LMT tool description: http://e.huawei.com.
A Local Maintenance Terminal (LMT) is a management system for the U1911 unified gateway. It provides various functions such as alarm management, configuration management, signaling tracing, upgrade, log collection and offline operations.
Let us know if we can assist you in anything else!