Huawei Technologies Co. Ltd BTS3812A-1900 Manuel D’Utilisation
NodeB LMT User Guide
Chapter 9 Monitoring NodeB Performance and State in
Real Time
Huawei Technologies Proprietary
9-11
Field
Description
MDB FileName
z
To create a *.mdb file to save the test curve
z
If it is blank, the system saves curve into the default file under
the default directory.
the default directory.
3) Set parameters in the dialog box.
4) Click
4) Click
OK.
A dialog box prompts you whether to start the Rx frequency scanning.
5) Click
Yes.
A monitor window is displayed showing the scanning curve.
Note:
The scanning automatically stops when it reaches the end RF frequency.
6) Stop the test in either way below:
z
Close the monitor window.
z
Right-click the task in the task list below the graphical area. Click Delete Task on
the shortcut menu to delete the task and curve.
the shortcut menu to delete the task and curve.
IV. Test Result Analysis
The test result analysis of Rx frequency scanning is as follows:
z
If the NodeB is separated from the antenna and feeder system, the curve has
jumps greatly higher than –108 dBm. This indicates that there must be internal
interference of the NodeB.
jumps greatly higher than –108 dBm. This indicates that there must be internal
interference of the NodeB.
z
If the NodeB is connected to the antenna and feeder system with NTTA powered
on, the curve has jumps greatly higher than –105 dBm. This indicates that there
must be external interference of the NodeB.
on, the curve has jumps greatly higher than –105 dBm. This indicates that there
must be external interference of the NodeB.
z
The shape of jumps tells the interference type in most cases:
z
A triangular or trapezium jump: There are broadband interferences. The peak of
the jump is the central frequency of the interference.
the jump is the central frequency of the interference.
z
A rectangle jump or a jump added with a rectangle: There is individual tone
interference. The central point of the upper side of the rectangle is the interfering
frequency.
interference. The central point of the upper side of the rectangle is the interfering
frequency.
9.8 Testing MTRU Output Power
I. Introduction
The MTRU output power test measures the output power of the MTRU, including: